• Title/Summary/Keyword: vulcanizates

Search Result 108, Processing Time 0.021 seconds

Binary Cure Systems of 1,6-Bis(N,N'-dibenzylthiocarbamoyldithio)-hexane and Benzothiazole Sulfenamides in Carbon Black-filled Natural Rubber Compounds

  • Choi, Sung-Seen;Park, Byung-Ho;Lee, Seung-Goo;Kim, Beom-Tae
    • Bulletin of the Korean Chemical Society
    • /
    • v.23 no.2
    • /
    • pp.320-324
    • /
    • 2002
  • Binary cure system is composed of different two cure accelerators, which can cause a synergy effect to delay the scorch time and to increase the cure rate. In this study, binary cure systems between 1,6-bis(N,N'-dibenzylthiocarbamoyldithio)-hexane (DBTH) and benzothiazole sulfenamides were investigated using carbon black-filled natural rubber compounds. N-Cyclohexyl-2-benzothiazole sulfenamide (CBS), N-tert-butyl-2-benzothiazole sulfenamide (TBBS), and 2-(morpholinothio) benzothiazole (MOR) were employed as benzothiazole sulfenamides. The binary cure systems show scorch safty at high temperature. The binary cure systems have faster cure rate and better reversion resistance than the single cure system of the benzothiazole sulfenamides. DBTH is found to be more effective to decrease the viscosity of a compound than the benzothiazole sulfenamides. Physical properties of the vulcanizates with the binary cure system are better than those of the vulcanizates with the single one.

Fracture Toughness of the Thermoplastic Vulcanizates from EPDM/PP/Ionomer Ternary Blends (EPDM/PP/Ionomer 삼원 블렌드로 된 열가소성 가황체의 파괴 인성)

  • Kim, K.;Cho, W.J.;Ha, C.S.;Go, J.H.
    • Elastomers and Composites
    • /
    • v.31 no.5
    • /
    • pp.341-346
    • /
    • 1996
  • The fracture mechanics 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 was fixed at 50/50 by weight. Two kinds of poly(ethylene-co-methacrylic acid) (EMA) lonomers 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 $(Na^+\;or\;Zn^{2+})$ and contents(5-20wt%) of the added EMA Ionomers. The ternary blend containing 20wt% zinc-neutralized EMA Ionomer and 1.0phr DCP showed the highest Jc values of the blends.

  • PDF

Influence of reinforcing systems and microstructures of SBR on water swelling behaviors of SBR composites (충전 시스템과 SBR의 미세 구조가 SBR 복합체의 수팽윤 거동에 미치는 영향)

  • Choi, Sung-Seen;Ha, Sung-Ho
    • Elastomers and Composites
    • /
    • v.42 no.2
    • /
    • pp.102-106
    • /
    • 2007
  • Water swelling behaviors of SBR vulcanizates with different reinforcing systems of carbon black, silica without a coupling agent, and silica containing a coupling agent were studied. Distilled water and 3.5% NaCl solution were used as swelling media. The water swelling ratios in the distilled water were higher than those in the salt solution. The water swelling ratios of the carbon black-filled samples were lower than those of the silica-filled ones. For the silica-filled SBR vulcanizates, the specimens without the silane coupling agent had higher water swelling ratios than those containing it. Water swelling behaviors of SBR composites with different 1,2-unit contents were also compared. The water swelling ratios tended to decrease by increasing the 1,2-unit content.

Morphology of EPDM-based Thermoplastic Vulcanizates (EPDM계 열가소성 가황체의 형태학적 연구)

  • Lee, Sang-Jin;Kim, Young-Kyoo;Park, Seong-Soo;Cho, Won-Jei;Ha, Chang-Sik
    • Elastomers and Composites
    • /
    • v.32 no.3
    • /
    • pp.157-165
    • /
    • 1997
  • The morphology of the thermoplastic vulcanizates prepared from ethylene-propylene-diene terpolymer, polypropylene and high density polyethylene(HDPE) or ethylene based ionomer were studied. Blends were prepared in a laboratory internal mixer where EPDM was cured in the presence of PP and HDPE or ionomer under shear with dicumyl peroxide(DCP). The effects of DCP concentration and rubber/plastics composition were studied. In the morphological analysis by scanning electron microscopy (SEM), a small amount of EPDM acted as a compatibilizer to HDPE and PP. It was also revealed that the dynamic vulcanization process could reduce the domain size of the crosslinked EPDM phase. When ionomer was added to EPDM/PP blend, the thermoplastic vulcanizate showed typical ductile fracture topology and the trend was more clearly observed when DCP contents and ionomer contents are higher.

  • PDF

Influence of Wax Molecular Weights on Wax Migration and Evaporation of Rubber Vulcanizates at Room Temperature (상온 노화 후 고무가황물에서 왁스의 이동과 증발에 미치는 왁스의 분자량 분포)

  • Im, Song-Hee;Choi, Sung-Seen
    • Elastomers and Composites
    • /
    • v.44 no.4
    • /
    • pp.397-400
    • /
    • 2009
  • Ozone caused the crack on the surface of a rubber article by oxidation of double bond at room temperature. Wax migrates to the surface of a rubber article and makes a physical barrier to prevent process of ozonation. We investigated change of molecular weight distribution of waxes in unfilled NR, SBR, and BR vulcanizates before and after aging at room temperature for 6 months. Migration and evaporation behaviors of wax in a rubber article at ambient conditions help understand a role of wax as an antidegradant and appearance contamination of a rubber article. The relative intensity distribution of n-alkanes of the NR specimen after the aging was shifted to higher molecular weight compared with the relative intensity distribution before the aging, while those of the SBR specimen before and after the aging did not show a big difference.

Study on Analysis of Vulcanized Rubber by Pyrolysis-Gas Chromatography(I) (Vulcanizates of NR BR and SBR) (Pyrolysis-Gas Chromatography를 이용한 가황 고무의 열분석에 관한연구(I) (NR, BR 및 SBR의 가황체))

  • Huh, D.S.;Kim, J.S.;Kim, K.J.;Ahn, B.K.;Suh, S.K.;Han, O.K.
    • Elastomers and Composites
    • /
    • v.22 no.1
    • /
    • pp.11-19
    • /
    • 1987
  • A coil pyrolyzer and processor-controlled gas chromatograph were used for analysis of rubber for compounding ratio of the single and blend rubber vlucanizates. Variables such as sample size, pyrolysis temperature, time allowed for pyrolysis, the column packing material, its length and programmable temperature for gas chromatography were examined to obtain optimum condition for application to NR, BR and SBR blends. By application fixed conditions, three kinds of standard curves were finally obtained from thirty samples of blend vulcanizates which were prepared in the pilot plant, NIRI. It is possible to determine rubber composition and their ratio in NR, BR and SBR products by pyrolysis.

  • PDF

Influence of Inorganic Filler on Properties of EPDM Compounds (무기 충전제가 EPDM 배합물의 특성에 미치는 영향)

  • Choi, Sung-Seen;Kim, Ok-Bae
    • Elastomers and Composites
    • /
    • v.46 no.2
    • /
    • pp.138-143
    • /
    • 2011
  • EPDM compounds and vulcanizates containing inorganic filler such as talc, calcium carbonate, or clay as well as carbon black were prepared, and the influence of inorganic filler on properties of the EPDM compounds and vulcanizates were investigated. The bound rubber contents did not significantly increase even though the inorganic filler was added. There were big aggregates in the EPDM samples with high loading inorganic filler. By adding the inorganic filler, the cure times tended to increase and the delta torque decreased. The modulus were on the whole decreased, whereas the elongation at break, tensile strength, and tear strength were increased by adding the inorganic filler. The decreased modulus and increased elongation at break can be explained with the decreased delta torque, the increases of tensile strength and tear strength can be explained with the increased elongation at break. By adding the inorganic filler, level of reinforcing in the EPDM compounds did not increase and the crosslink density decreased.

Studies on Surface Treatment of Kaolin Filler (Part 3) - Interaction between Surface Modified Filler and Rubber Matrix and Characterization of Reinforcement Effects of Filler - (Kaolin충전제(充塡劑) 표면처리(表面處理)에 관(關)한 硏究(연구) (제3보(第3報)) - 첨가(添加)된 충전제充塡劑)와 고무Matrix와의 Interaction 및 충전제(充塡劑) 보강효과(補强效果)의 특성화(特性化) -)

  • Kwon, Dong-Yong;Hong, Sung-Il
    • Elastomers and Composites
    • /
    • v.20 no.1
    • /
    • pp.25-39
    • /
    • 1985
  • Elastomer-filler interaction in terms of characterization of filler effects was studied using natural rubber(NR) loaded with kaolin fillers modified with sodium polyphosphate and poly(maleic anhydride), respectively. Kaolins modified with sodium polyphosphate or poly(maleic anhydride) show adhering characteristics by Kraus plot. Reinforcement activity according to Cunneen-Russell method is given by those fillers, in which sodium polyphosphate-treated kaolin presents more favorable results than that treated with poly(maleic anhydride) with respect to adhesion constant, reinforcement extent, elastic constant, and crosslink density. When applied to Blanchard's linkage reinforcement theory, NR vulcanizates loaded with kaolin modified with sodium polyphosphate meet the requirements for both approximate linkage reinforcement(${\psi}'$) of 1.02 to 4.94 and accurate linkage reinforcement($\psi$) of 1.00 to 1.18, representing the values of effective wetting($C_{\psi}$) for 0.001 to 0.029 and intrinsic linkage reinforcement(${\psi}_0$) for 1.015 to 1.124, respectively, whille negligible linkage reinforcement is shown by NR vulcanizates loaded with kaolin treated with poly(maleic anhydride). Dynamic storage modulus(G') given by surface modified kaolins presents more favorable crosslink density rates of $2.260{\times}10^{-5}\;mole/cm^3-min$. for sodium polyphosphate treated kaolin and $1.305{\times}10^{-5}\;mole/cm^3-min$. for poly(maleic anhydride) treated kaolin, respectively, compared to untreated kaolin showing the rate of $1.033{\times}10^{-5}\;mole/cm^3-min$.

  • PDF

Measurement of Thermal Shrinkage/Expansion Force of Filled Rubber (충전된 고무재료의 열변화에 따른 수축력/팽창력 측정)

  • Park, Sang-Min;Hong, Chang-Kook;Cho, Dong-Lyun;Kaang, Shin-Young
    • Elastomers and Composites
    • /
    • v.42 no.4
    • /
    • pp.201-208
    • /
    • 2007
  • In this study, the thermal shrinkage and expansion stresses of filled NR and SBR vulcanizates were measured to investigate the dimensional stability at an elevated temperature. When a rubber sample was held at constant pre-strain, a thermal stress developed upon heating due to the entropic consideration. The peak shrinkage stress of carbon black or silica filled NR decreased with increasing filler content. In SBR compounds, however, the peak shrinkage stress of SBR with 30 phr filler content was higher than that of unfilled compounds. The expansion stress of carbon black filled NR was changed little, but that of filled SBR increased with increasing the filler content. The peak expansion stress of silica filled NR and SBR vulcanizates increased with increasing silica content.

Recovery Behaviors of NR, SBR and BR Vulcanizates from Circular Deformation (NR, SBR, BR 가황물의 원형 변형으로부터의 회복 거동)

  • Jang, Joong-Hee;Choi, Sung-Seen
    • Elastomers and Composites
    • /
    • v.44 no.4
    • /
    • pp.442-446
    • /
    • 2009
  • Recovery behaviors of unfilled NR, BR, and SBR vulcanizates after aging with a circular deformation were compared to prevent the influence of reinforcing agent. Samples were aged at room temperature, 50, 70, and $90^{\circ}C$ for 10 days. Recovery increased by increasing the measurement time. Instantaneous recoveries less than 1.0 sec were obtained using the recovery variations with the measurement time. For aging at room temperature, difference in the recoveries of the rubber samples was not significant because the aging time was too short. However, for accelerated thermal aging at 50, 70, and $90^{\circ}C$, difference in the recoveries of the rubber samples was significant. Degree of recovery of BR specimen was higher than those of the others, while that of SBR was lowest. However, for accelerated thermal aging at $90^{\circ}C$, recovery of the NR sample was higher than that of the BR one. The initial recovery decreased by increasing the aging temperature and the decrement of SBR was larger than the others. The experimental results were explained with the resilience properties of rubbers and the crosslink density changes by thermal aging.