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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal Basic Information
Journal DOI :
The Polymer Society of Korea
Editor in Chief :
Volume & Issues
Volume 24, Issue 6 - Nov 2000
Volume 24, Issue 5 - Sep 2000
Volume 24, Issue 4 - Jul 2000
Volume 24, Issue 3 - May 2000
Volume 24, Issue 2 - Mar 2000
Volume 24, Issue 1 - Jan 2000
Selecting the target year
A Study on the Synthesis of ACF/PP-g-AAc Hybrid Fibrous Adsorbent by Irradiation and Their Separation Properties of Heavy Metals
Polymer Korea, volume 24, issue 1, 2000, Pages 1~7
The ACF/PP-g-AAc copolymers were synthesized by the irradiational grafting of acrylic acid onto ACF/PP fabric. The synthesis of copolymer was evidenced by the bands at 1720, 3600~3100
/ on FT-IR spectrum. After the adsorption of metal ions on ACF/PP-g-AAc copolymers, the morphology with the small deposits on the fiber surface were observed by SEM. The optimal time for the metal ion adsorption equilibrium on ACF/PP-g-AAc copolymers was 24 hrs and their adsorption capacities increased in the order of Mn
. The adsorption capacities of ACF/PP-g-AAc copolymers were invariable after more than 10 times of regeneration.eration.
Preparation and Characterization of Phenolic/Furfural Organic Gel Microspheres in Supercritical
Polymer Korea, volume 24, issue 1, 2000, Pages 8~15
Phenolic/furfural(P/F) gel microspheres were successfully produced by new supercritical
-soluble poly(dimethylsiloxane) (PDMS) was used as the stabilizer in this system. Spherical morphology of the gel microspheres was confirmed by scanning electron microscopy. Particle size and particle size distribution of P/F gel microspheres can be modified by variety of the solids content and the stabilizer content. The resultant P/F gel microspheres have average particle size in the range of 1-6
. The structure of P/F gel microspheres was revealed by thermogravimetric analysis and IR analysis.
Kinetic Consideration of Melt-copolymerization of Poly(butylene terephthalate) (PBT) and p-Acetoxybenzoic Acid (ABA)
Polymer Korea, volume 24, issue 1, 2000, Pages 16~22
Poly(butylene terephthalate- co-oxybenzoate)(PBOT) containing mesogenic oxybenzoate units in the main chain was synthesized through ester exchange reaction by melt mixing of poly(butylene terephthalate)(PBT) and p-acetoxybenzoic acid (ABA). From the kinetics of the copolymerization reaction, the activation energies and the rate constants of homopolymerization and copolymerization, k
, could be determined. From the reaction conditions of different compositions, 4/6, 5/5, and 6/4 of PBT/ABA, at 250, 260, and 27
, it was revealed that copolymerization between PBT and ABA proceeds on a pseudo-second order reaction if the ABA content and its conversion are low. In this case, the ratio of rate constants of homopolymerization to copolymerization was in the range from 1.08 to 3.17, indicating that the copolymer with more notable block character was obtained at the higher mole fraction of ABA and at higher temperature.e.e.
Adhesion Strength of Amorphous Polymer Interfaces by Solvent Welding
Polymer Korea, volume 24, issue 1, 2000, Pages 23~28
Autoadhesion strength of PS/PS Interfaces in solvent welding was determined as a function of processing conditions by butt joint test. It was verified that the chain mobility and surface roughness at PS/PS interface were enhanced by the applied solvent having a similar solubility parameter as PS and resulted in the dramatic improvement of autoadhesion strength at PS/PS interface. It was found that the mechanism of solvent welding is dependent upon the chain mobility due to the diffusion of solvent to PS interface and the contact area at interface. When the welding temperature is lower than the boiling point of applied solvent, the effect of chain mobility on autoadhesion strength was dominated, while contact area took more important role when welding temperature is above the boiling point of solvent. Autoadhesion strength increased with increasing contact time and contact temperature but :he effect of solvent on autoadhesion strength became smaller.
The Electrical Conductivity Characteristic of Polyaniline/Poly(ethylene oxide) Blends Prepared by In-Situ Polymerization of Aniline
Polymer Korea, volume 24, issue 1, 2000, Pages 29~37
Polyaniline (PANi)/Poly(ethylene of oxide) (PEO) in-situ blends were prepared by inducing phase separation through solvent evaporation after casting from solutions containing aniline monomer, oxidant (initiator), dopant and PEO in methanol/water mixed solvent. It was observed that the electrical conductivity first increases rapidly as PANi amount in the PANi/PEO blend increases and then slowly increases as the weight percentages of polyaniline become above 11 wt% in the blend. We also noted that the morphology of PANi/PEO blends changes when the holding time in a stirrer at constant temperature is varied and eventually affects the electrical conductivity. As the length of alkyl group in dopants increases, the electrical conductivity of doped blends increases. The PANi/PEO blend prepared with a high molecular weight of PEO yields higher electrical conductivity.
Flow and Mechanical Properties of Linear and Branched Polycarbonates Blends
Polymer Korea, volume 24, issue 1, 2000, Pages 38~47
A study of linear and branched polycarbonates blend system is presented. Flow and mechanical properties, and miscibility were studied for the blends of various compositions. No phase separations were observed in the blend systems. The mechanical properties of blends were examined through tensile strength, tensile modulus, flexural strength, flexural modulus and impact strength. Melt viscosity, storage and loss moduli of the blends with various compositions were examined at various temperatures. The dependence of viscosity on molecular weight was also presented. Flow properties of the blends showed significant variations however, mechanical properties were relatively independent of the compositions. As the content of branched polycarbonate increased, the dependence of viscosity on molecular weight and shear thinning behavior became more marked. Therefore the blend systems which have same mechanical properties but different flow properties can be obtained.
Mechanical Properties and Biodegradability of PCL/TPS Blends
Polymer Korea, volume 24, issue 1, 2000, Pages 48~57
Polycaprolactone (PCL) and thermoplastic starch (TPS) blends were prepared. Mechanical properties, thermal property, water absorption, biodegradability by composting and surface morphology of PCL/TPS blends were investigated. The compositions of PCL/TPS blends were 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, and 10/90. Strength and elongation at break decreased as the content of TPS increased, while modulus increased. DSC thermogram of TPS showed two glass transition temperatures (T
) at 23
. And TPS proved to be an amorphous polymer because there was no endothermic peak due to the melting of starch crystal. The unchanged melting temperatures and T
's of PCL/TPS blends revealed that PCL and TPS were not miscible. All of the blends were found to be mechanically compatible but phase separated in each other. After 45 days composting, the biodegradability of PCL was 44% and that of PCL/TPS blends increased as the contents of TPS increased.
Sequence Structure and Thermal Property of Poly(butylene terephthalate) (PBT)/p-Acetoxybenzoic Acid (ABA) Copolymers Obtained Through Melt Trans-esterification Reaction
Polymer Korea, volume 24, issue 1, 2000, Pages 58~64
Poly(butylene terephthalate-co-oxybenzoate) (PBOT ) was synthesized by melt trans-esterification of poly(butylene terephthalate)(PBT) and p-acetoxybensoic acid (ABA) at 250, 260, and 27
with the compositions of PBT/ABA of 4/6, 5/5, 6/4. The sequence analysis of PBOT with a
H FT-NMR indicated that the number of consecutive oxybenzoate units ranges from 1.2 to 1.5, which is larger than that of the corresponding poly(ethylene terephthalate)(PET)/ABA (PEOT) obtained at the same reaction conditions as the PBOT. The difference in the block length influenced the thermal degradation behavior: Polyoxybezoate (POB), PBT and PEOT showed one-step degradation whereas PBOT exhibited two-step degradation. The results suggested that PBOT consisted of three phases of PBT-rich phase, random phase of PBT and ABA, and ABA-rich phase.
Cure Kinetics for the Acid Anhydride-cured Epoxy System Using a Near-infrared Reflection Spectroscopy
Polymer Korea, volume 24, issue 1, 2000, Pages 65~71
The latent properties and cure kinetics of an acid anhydride-cured epoxy resin have been investigated by a near-infrared (NIR) reflection spectroscopy. The assignments of the latent properties and cure behaviors were performed by the measurements of the NIR reflectance for epoxide and hydroxyl groups at different temperatures. A comprehensive analysis of the origin, location, and shifts during reaction of all major NIR absorption peaks in the spectral range from 4000 to 7100
/ was provided. The extent of reaction was determined from NIR absorption band at the 4530
/ depending on epoxide concentration and cure temperature.
Preparation and Curing Behavior of Polyurethane Coatings by Polyester/Lactone Polyol and HDI-biuret
Polymer Korea, volume 24, issue 1, 2000, Pages 72~81
Benzoic acid polyester/lactone polyol were synthesized by polycaprolactone 0201 as diol, trimethylolpropane as triol, adipic acid as dibasic acid, and benzoic acid as monobasic acid. Polyisocyanate prepolymer Desmodur N-100 of HDI-biuret type was used in this study. Two-component polyurethane coatings were prepared by blending benzoic acid polyester/polycaprolactone, polyisocyanate, wetting/dispersing agent, white pigment, and flowing agent. Various properties were examined on the film coated with the prepared polyurethane. They showed excellent physical properties such as abrasion resistance, accelerated weathering resistance, and yellowness index. They also showed good physical properties such as flexibility, impact resistance, 60
specular gloss, cross hatch adhesion, hydrocarbon resistance, and lightness index difference. Hardness of coating showed a little poor character. The introduction of polycaprolactone 0201 as diol in the polyurethane coatings improved the hydrocarbon resistance, impact resistance, and flexibility of coatings. According to the drying and curing behavior with the contents of benzoic acid, they seem to have reasonable coating properties such as drying time of 2 to 4 hours and pot-life time of 20 to 37 hours.
Blood Compatibility of Polyurethane-poly(vinyl alcohol) Polymer Blends
Polymer Korea, volume 24, issue 1, 2000, Pages 82~89
The blood compatibilities of PU/PVA polymer blends with different mixing ratios were evaluated using various methods, such as fibrinogen adsorption, plasma recalcification time, platelet adhesion, whole blood clotting time, and complement activation. In addition, PVA on the surface of the polymer blends was crosslinked by glutaraldehyde to restrain the mobility of PVA molecules for characterizing the effect of PVA in the polymer blends on blood compatibility. The fibrinogen adsorption on the polymer blends decreased with the increase of PVA amount in the polymer blends. The plasma recalcification times of the polymer blends with 10-50 wt% PVA were longer than those of PU, PVA, and polymer blends with higher amount of PVA. The morphological changes and adhesion of platelets on the polymer blends with 30-50 wt% PVA were less than those on the other materials. The blood clotting times and complement activation on the polymer blends with 30-50 wt% PVA were reduced, compared to the other materials. On the other hand, the blood compatibility of the crosslinked polymer blends was relatively decreased, compared to the non-crosslinked ones. According to these experimental results, the blood compatibility of the polymer blends with 30-50 wt% PVA was better than that of the other materials and such a blood compatibility of the polymer blends might be related to the mobility of PVA molecules on the surface.
Characteristics of Organic Electroluminescent Device Consisting of PDPMA LB Film as a Polymer Hole Transport Material and Alq
Polymer Korea, volume 24, issue 1, 2000, Pages 90~96
Organic electroluminescent (EL) device was fabricated with Alq
as an emitting material and PDPMA ultra thin film prepared by Langmuir-Boldgett technique as a polymer hole transport layer. A stable condensed PDPMA monolayer was obtained using arachidic acid as a surface active material. The thickness and absorbance of PDPMA LB film increased line-arly with the layer numbers. The organic multilayered device consisted of ITO/PDPMA LB film (19 layers)/Alq
/Al emitted green light with brightness of 2500 cd/m
at a DC 14 V Especially, the drive voltage of EL device having PDPMA LB film of 15 layers exhibited the value as low as 4 V. The effects of thickness control and molecular orientation in the PDPMA LB film on EL performance were discussed.
Influence of Activation Temperature on Surface and Adsorption Properties of PAN-based Activated Carbon Fibers/Phenolic Resin Matrix Composites
Polymer Korea, volume 24, issue 1, 2000, Pages 97~104
PAN-based activated carbon fibers/phenolic resin matrix composites (ACFCs) were manufactured via molding process with oxidized carbon fabrics (plain-type) and phenolic resin (resole-type) compounded by 70 : 30 wt%. The green body (as molded) was submitted to carbonization (at 100
) in an inert environment and activation (at 700, 800, 900 and 100
) in a
environment. In this work, the influence of activation temperatures was investigated in surface properties, such as pH, acid- and base-values by titration method, and in adsorption properties, i.e., specific surface area and pore structures by BET-method of the composites. Also, the pressure drops of the specimens were calibrated by ASTM. As a result, the activation temperature influenced the surface property of ACFCs. When the activation temperature was higher than 90
, the surface was gradually developed in basic nature. And, the evolutions of specific surface area, total pore volume and pore size distribution of ACFCs could be easily confirmed the dependence on the activation temperature. Among them, well-developed pore structure from adsorption characteristics was changed of the ACFCs activated at 90
. Also, the pressure drop was slightly decreased with increasing the temperature due to increasing the burn-off with heat treatment temperature of ACFCs.
Diffusion-controlled Cure Kinetics of High Performance Epoxy/Carbon Fiber Composite Systems
Polymer Korea, volume 24, issue 1, 2000, Pages 105~112
Using a commercial epoxy/carbon fiber composite prepreg (DMS 2224) as a model system, the cure kinetics of vitrifying thermoset system were analyzed by isothermal and dynamic-heating experiments. Focusing on the processing condition of high performance composite systems, a phenomenological kinetic model was developed by using differential scanning calorimetry (DSC) and reaction kinetics theories. The model system exhibited a limited degree of cure as a function of isothermal temperature seemingly due to the diffusion-controlled reaction rates. The diffusion-controlled cure reaction was incorporated in the development of the kinetic model, and the model parameters were determined from isothermal experiments. The first order reaction was confirmed from the characteristic shape of isothermal cure thermograms, and the activation energy wes 78.43 kJ/mol. Finally, the proposed model was used to predict a complex autoclave thermal condition, which was composed of several isothermal and dynamic-heating stages.
Pseudo Liquid Crystallinity and Characteristics of PHB/PEN/PET Melt Blend
Polymer Korea, volume 24, issue 1, 2000, Pages 113~123
Poly(p-hydroxybenzoate) (PHB)/poly(ethylene terephthalate) (PET) 8/2 thermotropic liquid crystalline copolyester, poly(ethylene 2,6-naphthalate) (PEN) and PET were mechanically blended to obtain the pseudo liquid crystalline (LC) phase of ternary blends. The torque values of blends with increasing PHB content were abruptly decreased above 40 wt% of PHB content, because the melt viscosity of ternary blends decreased. Tensile strength and initial modulus of blends containing above 30 wt% PHB were improved with increasing PHB content. Tensile strength and modulus of fiber were increased with PHB contents and take-up speed. Degree of transesterification and randomness of blends were increased with blending time. The blend of 40 wt% PHB was shown pseudo LC phase in the polarized optical photographs. Crystallinity of PHB/PEN/PET ternary blend were increased with PHB content.
Copolymerization and Oligomerization of Isobutylene Oxide
Polymer Korea, volume 24, issue 1, 2000, Pages 124~127
To improve various physical properties of poly(isobutylene oxide) copolymers of isobutylene oxide and cyclohexene oxide have been synthesized with triisobutylaluminum as catalyst. The molecular weights of the copolymers are rather lower than that of poly(isobutylene oxide) prepared with diethylzinc catalyst. The glass transition temperatures of the copolymers are between those of two homopolymers. The copolymers of isobutylene oxide and vinyl cyclohexene oxide showed better thermal stability. Oligomer of isobutylene oxide has been synthesized for polyol and lubricant application. Acid catalyzed oligomerization gave vary complex mixture. But base catalyzed reaction afforded the pentamer and hexamer rich oligomer mixtures.
Miscibility and Mechanical Properties of Polycaprolactone-polyamide Block Copolymer/Poly(vinyl chloride) Blend
Polymer Korea, volume 24, issue 1, 2000, Pages 128~132
The miscibility between poly(vinyl chloride) (PVC) and polycaprolactone (PCL)-polyamide block copolymer whose content of PCL block is 62.7 wt%, was studied by differential scanning calorimetry. The PCL segment in the block copolymer and PVC has the miscibility showing single glass transition temperature (T
). The miscible PVC molecule inhibited the crystallization of PCL segment, making an amorphous homogeneous phase of PCL and PVC segments at high PVC content. The blends had rubber elasticity at the temperature range between the T
of amorphous homogeneous phase of PCL and PVC segments and the melting temperature of polyamide segment, when both phases coexist.ist.
Synthesis of Ion Conducting Polymer Having Low Temperature Characteristics : I. Synthesis and Characterization of Amorphous PEO Copolymer
Polymer Korea, volume 24, issue 1, 2000, Pages 133~139
Poly(ethylene glycol) with number-average molecular weight (M
) of 200 (PEG 200) or 400 (PEG 400) was reacted with various linking agents (CH
Br) in the presence of alkali to form of oxyalkylene linked chains. Molecular weights of copolymers were controlled using feed mole ratio of alkali/CH
/PEG. The M
of the polymers measured by end group analysis and that measured by GPC agreed well. Molecuglar weights of polyether copolymers obtained from PEG 200 and PEG 400 were about 500~8500 and 1000~2000, respectively. Polyether copolymers prepared from PEG 400 showed melting points of around 1
. Glass transition temperatures of the copolymers were around -75
and the crystallinity was about 0~25%. The polyether copolymers prepared from PEG 200 had no crystallinity below the M
of 2500. 2500.