• Title, Summary, Keyword: crosslinking elastomer

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Thermo-reversible Crosslinking Elastomer through Supramolecular Networks (초분자 네트워크를 이용한 열가역성 가교 탄성체)

  • Bae, Jong-Woo;Oh, Sang-Taek;Kim, Gu-Ni;Baik, Hyen-Jong;Kim, Won-Ho;Choi, Sung-Seen
    • Elastomers and Composites
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    • v.45 no.3
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    • pp.165-169
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    • 2010
  • Recently supramolecular network thermo-reversible crosslinking elastomer having flexibility, various functionality, and advantages of thermoplastic elastomer (TPE) such as recycle and easy processbility is introduced. Although thermo-reversible bonds such as hydrogen bond and ionic cluster is recognized as a common technology since 1990, control technology of bonding and dissociation of crosslink in supramolecular network is a recent technology. In this review, characteristics of thermo-reversible crosslinking elastomer having rheological properties of TPE and reinforcing behaviors of thermoset elastomer are summarized.

A Study on Curing Reaction of 1-Chlorobutadiene-Butadiene Copolymer by Moisture (1-Chlorobutadiene-Butadiene Copolymer의 수가교반응(水架橋反應)에 관한 연구(硏究)(II))

  • Yoo, Chong-Sun;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.22 no.4
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    • pp.305-313
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    • 1987
  • In this study, as one of the developing ways of the functional elastomer, improvement of the functionality of 1-Chlorobutadiene-Butadiene Copolymer(CB-BR) was attempt through curing reaction by moisture. The curing reaction of CB-BR was determined an use of $\gamma$-Aminopropyltriethoxysilane(APS) and $\gamma$-Aminopropylmethyldiethoxysilane(ADS) as a crosslinking agent with filler at so the uncrosslinked elastomer was exposured in the air and curing reaction by moisture in the air was studied. The results obtained are as follows. 1. APS was more efficient than ADS as a crosslinking agent for CB-BR 2. Optimum amount of APS for moisture cured elastomer was r=1.5(at the ratio of $[APS]/[Cl^*]$) also in case(r=1.5), elastomer formed after soaking $T_{72}$ had similar physical properties with elastomer crosslinked by sulfur and it was very good. 3. Uncrosslinked elastomer(CB-BR+APS+Silica) was easily crosslinked by exposure to the air, and the physical properties was also satisfactory.

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Reinforcement of Polychloroprene by means of Silia and Glass Fiber (Silica와 Glass Fiber에 의한 Polychloroprene의 보강(補强))

  • Yoo, Chong-Sun;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.23 no.3
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    • pp.223-229
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    • 1988
  • The effect of triazine thiol derivative on the physical properties of silica-polychloroprene(CR) composites and glass fiber(MGF)-CR composites was investigated. Optimum cure time of the MGF composites filled with 2-dibuthylamino-4, 6-dithiol-s-triazine(DBT) was the fastest one, while maximum torque was the best in case of the silica composites filled with s-triazine-2,4,6-trithiol(TAT) on the Oscillating Disk Rheometer(ODR) test. Stress-strain curves of the composites showed that the physical properties such as 100% modulus, 300% modulus, tensile strength of the silica composites filled with DBT was very satisfactory and the silica composites filled with TAT was higher density of crosslinking than other crosslinked elastomer. In aging properties, elastomer filled DBT and TAT were progress post-curing reaction with increasing of aging time and it have been improved the tensile strength and crosslinking density.

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Peroxide Modification of Nylon 12 Elastomer (Peroxide 개질에 따른 Nylon 12 elastomer의 특성 연구)

  • Choi, Myung-Chan;Jung, Ji-Yeon;Chang, Young-Wook
    • Elastomers and Composites
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    • v.48 no.1
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    • pp.18-23
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    • 2013
  • Nylon 12 elastomer was slightly crosslinked in molten state by the addition of small amount of dicumyl peroxide (DCP) as a crosslink agent and triallycyanuate (TAC) as a co-agent during melt compounding at $160^{\circ}C$ in an internal mixer. The effect of the peroxide crosslinking on mechanical, dynamic mechanical and rheological properties of the nylon 12 elastomer was investigated by means of tensile testing, dynamic mechanical analysis (DMA) and small amplitude oscillating rheometer, respectively. With modification, there is an improvement in tensile modulus and Young's modulus with decease in elongation at break. DMA results for peroxide modified nylon 12 elastomers demonstrated that the glass transiaiton temperature of PTMG segment shifted to higher temperature and the storage modulus remained constant above the melting temperature of nylon 12 segments. Melt rheological studies revealed that the peroxide modified nylon 12 elastomer exhibited a more solid like behavior and stronger shear thinning behavior compared to neat nylon 12 elastomer, which was more prominent at higher TAC content in the polymer matrix. The peroxide modified nylon 12 elastomer exhibited good elastic recoverability and improved mechanical properties without sacrificing melt processibilty, and especially the service temperature range increased as compared to neat nylon 12 elastomer.

No-binding Molding Technology Development for Waste Rubber Recycling

  • Zhang, Xiao Jie;Hong, Sung Woo;Kim, Jin Kuk
    • Elastomers and Composites
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    • v.53 no.1
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    • pp.19-25
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    • 2018
  • In this study, a new process was developed to develop the waste rubber material recycling system. Firstly, the blending of the reclaimed rubber/virgin rubber as a compounding technology was investigated in this study. Secondly, the removal of odor by using zeolite. Thirdly, the continuous crosslinking process technology was studied the technology can solve the environmentally harmful substances and economic problems. Based on this technology, we have started to develop application technologies such as floor mats and rubber sheets for forklifts, and will further study the environmentally conscious products in various ways. Our research will contribute to the recycling industry.

Organic Reaction Utilizing Cycilic Carbonate I. Polymerization of monochloroethylenecarbonate with phenols

  • Moon, Do-Won
    • Archives of Pharmacal Research
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    • v.8 no.4
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    • pp.191-195
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    • 1985
  • The polymerization of title compound (MCEC, I) with phenols led to give corresponding resole type polymer. Phenol and p-methoxyphenol polymer had a relative higher molecular weight and a property of elastomer, but p-chloro-and p-nitrophenol polymer had a lower ones. Also, phenol and p-meth-oxyphenol gave to crosslinking polymer by elongation of reaction period and rising of temperature.

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Preparation of EPDM/Polyamide12 Elastomers through Electron Beam Irradiation (전자선 조사를 통한 EPDM/Polyamide12 탄성체의 제조에 관한 연구)

  • Jung, Hyo Shin;Park, Jung Il;Kang, Phil-Hyun;Choi, Myung Chan;Chang, Young-Wook;Hong, Sung Chul
    • Polymer(Korea)
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    • v.37 no.5
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    • pp.571-578
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    • 2013
  • Polyamide12 (PA12) is blended with ethylene propylene diene rubber (EPDM) at various compositions in the presence of maleated EPDM (mEPDM) to afford blend materials having the characteristics of thermoplastic elastomer (TPE). The EPDM/PA12 melt-blends are further irradiated with electron-beam (e-beam) at 0~100 kGy dosage, yielding selective crosslinking between EPDM chains while retaining melt-processibility originated from PA12 phase. mEPDM acts as a compatibilizer and affords additional improvements in mechanical properties of the EPDM/PA12 blend. With 25 kGy of e-beam irradiation and mEPDM, the EPDM/PA12 blends successfully exhibit TPE behaviors with reasonable elastomeric and mechanical properties.

Basic Study for Development of Magneto-rheological Elastomer (자기장 응답형 엘라스토머 개발을 위한 기초연구)

  • Chung, Kyung-Ho;Yoon, Kyu-Seo
    • Elastomers and Composites
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    • v.45 no.2
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    • pp.106-111
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    • 2010
  • Magneto-rheological elastomers (MREs) were manufactured by incorporation of magnetic responsible powder (MRP) into natural rubber and silicone rubber. The optimum loading amounts of MRP was 30 vol.% and the natural rubber based MRE (NR-MRE) showed better mechanical property than that of silicone rubber based MRE (S-MRE). However, the modulus shift ratio caused by S-MRE, measured by Self-modified Electromagnet Applied Fast Fourier Transform Analyser (SEFFTA), was higher than that of NR-MRE. The modulus shift ratio caused by NR-MRE was 10%, while the modulus shift ratio caused by S-MRE was 35.7%. The modulus shift ratio could be improved by orienting the magnetic direction of MRP before crosslinking the MRE. The degree of orientation of MRP was analyzed using SEM.

A Study on Curing Reaction of 1-Chlobutadiene-Butadiene Copolymer by Moisture (1-Chlorobutadiene-Butadiene Copolymer의 수가교반응(水架橋反應)에 관한 연구(硏究)(I))

  • Yoo, Chong-Sun;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.22 no.3
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    • pp.195-203
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    • 1987
  • In this study, as one of the developing ways of the functional elastomer, improvement of the functionality of CB-BR was attempted through moisture curing reaction. The curing reaction of CB-BR was determined with an use of 3-aminopropyltriethoxysilane(APS) as a crosslinking agent, also a solution reaction with an active chlorine of CB-BR was elucidated by using a reaction kinetics theory and a study of physical property was made through moisture curing on the compound of 3-aminopropyltriethoxysilane and CB-BR The results of this study obtained are as follows : 1) CB-BR reacted easily with APS in the liquid state and the reaction rate coefficient and activation energy were as follows : 2) Optimum pressure condition of moisture cured elastomer(CB-BR+APS) was 20 minutes at $150^{\circ}C$, and the crosslinked elastomer was close to the theoretical value (q=1) for Flory's equation($\frac{\alpha}{\alpha-1}=q{\nu}RT$)

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Preparation and Characteristics of Polyurethane Hybrid Sealant Modified with Polydimethylsiloxane (Polydimethylsiloxnae 변성 Polyurethane Hybrid Sealant의 제조와 그 특성)

  • Kang, Doo-Whan;Park, Seung-Woo
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.488-492
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    • 2011
  • Three isocyanatopropyldimethoxysilylpolydimethylsiloxanes(IDMSi-PDMS) were synthesised from the reaction of isocyanatopropyltrimethoxysilane with monohydroxyl group termainated PDMS having different molecular weight($M_n$=5000, 10000, and 20000). Then PDMS modified polyurethane hybrid elastomer(PSMPH) were prepared from the reaction of IDMSi-PDMS with ${\alpha}$, ${\omega}$-hydroxyl group terminated polyurethane. PSMPH sealant was prepared by compounding PSMPH elastomer with additives such as plasticizer, adhesion promoter, crosslinking agent, vicosity increasing agent, inorganic filler, and catalyst at room temperature under nitrogen atmosphere. The methoxy group in the PSMPH sealant should be crosslinked with the hydroxyl group in the building stone or moisture by typical sol-gel reaction. The adhesive strength of the sealant having PDMS of $M_n$=5000 showed 40.28 kg of maxium load and 20.14 kg of break load. The shrinkage rate of the sealant having PDMS of $M_n$=20000 was 5.7% as the best result. Also, their skin over time, slump, oil content after 8 days under oil soaked paper and alkaline resistance characteristics show good results.