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SBR, EPDM 및 Solvent로 이루어진 삼성분계의 상 평형에 관한 연구
고진환 ( Jin Hwan Go ),박병호 ( Byung Ho Park ) 한국고무학회 2002 엘라스토머 및 콤포지트 Vol.37 No.4
서로 다른 고분자 혼합물의 조성 및 농도에서 온도 변화에 따른 상 분리 거동을 관찰하였다. 용매는 EPDM에 poor solvent로, SBR에는 good solvent로 작용하는 벤젠을 사용하였다. Cloud point curves(CPC)에서 각 고분자 시료에 대한 용매의 친화력과 상호 반발력 차이 때문에 15 ℃를 전후하여 CPC에 큰 변화가 있었다. 5℃ ~ 25℃ 영역에서 고분자 혼합물 조성비와 농도에 따라 비상용성이 나타났으며, 분리된 각 상의 조성은 상분리 온도에 크게 의존되어 있음을 확인하였다. EPDM과 SBR의 상호작용 파라메타는 0.6301 ~ 1.0775의 범위로 이 두 고분자 물질은 상용성이 없는 것으로 결론지었다. N/A
EPDM/PP/Ionomer 삼원 블렌드로 된 열가소성 가황체의 파괴 인성
고진환 ( Jin Hwan Go ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.4
The fracture mechanic investigation of the thermoplastic vulcanizates(TPV) from EPDM and PP/ionomer ternary blends was performed in terms of the J-integral by measuring fracture energy via the locus method. The TPV from ternary blends consisting of EPDM,PP and ionomer were prepared in a laboratory integral mixer by blending and vulcanizing simultaneously. Vulcanization was performed with dicumyl peroxide (DCP) and the composition of EPDM and PP were fixed at 50/50 by weight. Two kinds of poly(ethylene-co-methacrylic acid)(EMA) ionomers were used. The J-integral values at crack initiation, Jc, of the dynamically vulcanized EPDM and PP/EMA ionomer ternary blends were affected by the cation types (Na+ or Zn2+) and contents(5-20 wt%) of the added EMA inomers. The ternary blend containing 20wt % zinc-neutralized EMA ionomer and 1.0 phr DCP showed the highest Jc values of the blends.
트레드 고무의 페인효과에 따른 타이어 주행 성능과 물성 연구
박병호 ( Byung Ho Park ),고진환 ( Jin Hwan Go ) 조선대학교 공학기술연구원 2013 공학기술논문지 Vol.6 No.3
Hysteresis loss of the compound is the most important factor for predicting low rolling resistance and wet traction of the tire. It is mainly due to the interactions among fillers-fillers and fillers .polymers (1. 2). For evaluating its performance, most tire companies have currently used dynamic properties which related to the value of tangent delta with varying temperature. However, it is not easy to determine the degree of filler-filler interaction and filler-polymer interaction from its value and other physical properties. This study tested Payne effect which related to S-SBR types, polymer blend, filler (silica), coupling agent (TESPT) and chemicals in silica filled tread compound. Test results shown that the degree of interaction between silica and polymer is directly evaluated from Payne effect of S-SBR microstructure or its polymer blends. Its results exhibited that modified (functional group introduced) SBR was more important factor in filler-polymer interaction than microstructures of S-SBR. It also verified that high BET silica filled compound exhibited more softening effect with increasing strain amplitude. In addition, processing oil and dispersion agent were investigated to asses Payne effects in silica filled compound. It is shown that Payne effects are able to be used as a valuable test method for compounding design of tire tread compounds.
하수 슬러지의 온도 증가율에 따른 탄화 활성화 생성물 특성
김록호 ( Rok Ho Kim ),고진환 ( Jin Hwan Go ),전영남 ( Young Nam Chun ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.2
Carbonization and activation of dried sewage sludge was studied to produce hydrogen rich gas and sludge char for converting to energy resources. A batch-type wire mesh reactor was used to study the effect of heating rate. The characteristic of producer gas, gravimetric tar, light tar, and sludge char were identified. With the increase in the heating rate, the sludge char decreased, the producer gas increased, and the tar generation slightly increased. Hydrogen increased with the increase in the heating rate. And carbon monoxide, carbon dioxide, methane, ethylene, and ethane reached their maximum according to different production mechanism up to decreasing the species. The increase in the heating rate gradually resulted in the creation of micropores, which developed to the maximum when the heating rate was 55℃/min. The adsorption of tar which simulated condensible tar (benzene) was tested and the break point, saturation point and adsorption amount were 15 min, 50 min, 182 mg/g respectively.
특정상호작용에 의한 폴리프로필렌 / EPDM 블렌드의 상용성 향상
조영욱(Young Wook Cho),고진환(Jin Hwan Go),이원기(Won Ki Lee),이진국(Jin Kook Lee),조원제(Won Jei Cho),하창식(Chang Sik Ha) 한국고무학회 2000 엘라스토머 및 콤포지트 Vol.35 No.1
N/A Miscibility improvement between polypropylene(PP) and ethylene-propylenediene-terpolymer (EPDM) was studied by introducing specific interaction into both polymers. PP was modified by grafting malefic anhydride(MAH) onto backbone, leading to MAH-grafted PP(PP-g-MAH). Sulfonated EPDM ionomer neutralized with bivalent zinc cation(ZnSEPDM) was used as one component. The blends of PP-g-MAH and ZnSEPDM were prepared at 200℃ in Brabender Roller Mixer. Fourier transform-infrared(FT-IR) spectroscopic and dynamic mechanical studies have been performed to investigate the miscibility. FT-IR spectral peak corresponding to carbonyl group in PP-g-MAH and that to sulfanate group in ZnSEPDM were shifted to lower and higher frequency with increasing ZnSEPDM content, respectively, in the blends. Glass transition temperature of ZnSEPDM was increased up to 70wt.% of ZnSEPDM, and again decreased above 70wt.%. It can be concluded from the shift of FT-IR characteristic peaks and the changes of glass transition temperatures that the miscibility between PP and EPDM was improved via introducing specific interaction, i.e., dipole-ion interaction.
보강성 충전제를 함유한 합성고무 블렌드의 물리적 특성에 관한 연구
이석(Seag Lee),고진환(Jin Hwan Go) 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.4
N/A In order to investigate the physical properties of rubber blend compound, this experiment was carried out on the cure rate, loss tangent, reinforcement and abrasion properties of S-SBR(solution styrene-butadiene rubber) blends containing silane coupled silica and E-SBR (emulsion styrene-butadiene rubber) blends containing carbon black as a model compound. ESBR blend showed the highest total bound rubber(TBR), while S-SBR blends showed constant TBR level regardless of rubber type. Rapid cure rate was achieved when the styrene and vinyl content of rubber microstructure decreased and TBR content of rubber compounds increased. The modulus as the index of rubber reinforcement showed the linear relation with TBR content. The large amount of PICO loss was observed when the styrene and vinyl content of rubber microstructure increased, while the small amount of PICO loss was observed when the ratio of butadiene increased in the S-SBR blends with silane copuled silica. The high loss tangent at 0℃, the low loss tangent at 60℃, and the large difference of loss tangent were shown in the S-SBR blends with high styrene content compared to E-SBR blend.