NBR/EPVC共混物的性能研究

研究NBR／聚氯乙烯糊树脂(EPVC)常温共混物的物理性能及耐热老化性能，并与NBR／硬质聚氯乙烯(SPVC)高温共混物进行对比，结果表明，加入EPVC可提高NBR的耐热老化性能；与NBR／SPVC高温共混物相比，NBR／EPVc常温共混物的300%定伸应力、拉伸强度和撕裂强度增大，耐热老化性能提高，耐臭氧老化性能相当，且共混工艺简单，可节约能源和降低混炼成本。     

硫化体系对NBR/PCMO共混物性能的影响

研究不同硫化体系对NBR／氯化聚醚(PCMO)共混物性能的影响。试验结果表明，低硫高促硫化体系共混物硫化胶的耐热空气老化性能较好，复合硫化体系共混物硫化胶的压缩永久变形性能最佳；过氧化物硫化体系中硫化剂DCP用量为3．5份，甲基丙烯酸锌[Zn(MMA)2]／DCP硫化体系中Zn(MMA)2用量为10份、硫化剂DCP用量为     

硫化剂TCY对丁腈橡胶/氯磺化聚乙烯共混物性能的影响

研究了硫化剂TCY对丁腈橡胶／氯磺化聚乙烯共混物性能的影响。结果表明，硫化剂TCY的加入，使NBR／CSM共混物的正硫化时间、最低扭矩和最高扭矩增大，同时缩短了焦烧时间。当硫化剂TCY用量为0．8份时，共混物具有较好的力学性能。适当增加硫化剂TCY用量，可提高NBR／CSM共混物的耐热老化性能和耐油性能。     

硬化剂TCY对丁腈橡胶／氯磺化聚乙烯共混物性能的影响

研究了硫化剂TCY对丁腈橡胶／氯磺化聚乙烯共混物性能的影响。结果表明，硫化剂TCY的加入，使NBR／CSM共混物的正硫化时间、最低扭矩和最高扭矩增大，同时缩短了焦烧时间。当硫化剂TCY用量为0．8份时，共混物具有较好的力学性能。适当增加硫化剂TCY用量，可提高NBR／CSM共混物的耐热老化时间和耐油性能。     

CR／NBR共混物性能的研究

研究了橡胶共混比、炭黑品种及用量、不同防老剂对CIL／NBR共混物性能的影响，考查了共混物的力学性能、热空气老化性能和耐天候老化性能。试验结果表明，CR的拉伸强度和撕裂强度大于NBR，耐热空气老化性和耐天候老化性均优于NBR；炭黑N550的补强性大于N774，共混胶加入炭黑N774比加入N550有更好的老化性能，且30份N774比15份N774的老化性能更好；加入石蜡和N，N’-二辛基对苯二胺均可提高共混胶的老化性能，N，N’-二辛基对苯二胺的效果更好，但都使共混胶的强度下降。     

硫化剂TCY对丁腈橡胶／氯化聚乙烯共混物性能的影响

研究了硫化剂TCY对丁腈橡胶／氯化聚乙烯共混物性能的影响。结果表明：硫化剂TCY的加入．使NBR／CM共混物的最低扭矩和最高扭矩增大,同时缩短了焦烧时间。当硫化剂TCY用量为1．5份时．共混物具有较好力学性能。适当增加硫化剂TCY用量,可提高NBR／CM共混物耐热老化性能和耐油性能。     

增塑剂DOP对NBR/PP共混物性能的影响

研究增塑剂DOP对NBR／PP共混物物理性能、结晶性能及流变特性的影响。结果表明，随着增塑剂DOP用量增大，NBR／PP共混物的硬度明显降低，流动性能显著提高；增塑剂DOP用量对共混物的结晶性能影响不大；加入增塑剂DOP，共混物老化后的100％定伸应力和拉伸强度提高，拉断伸长率和流动性能下降。     

马来酸酐接枝橡胶离聚体改性PVC的研究

试验研究以马来酸酐（MA）接枝BR部分替代NBR，通过离子交联提高BR／NBR／PVC共混物的相容性。正交试验结果表明，当接枝单体（MA）、交联剂（氧化锌）和引发剂（过氧化二异丙苯）用量分别为1．5，4和0．1份时，共混物的拉伸性能较好；红外光谱分析证明，MA已成功地接枝在BR大分子链上。     

NBR/PVC共混物的共混工艺和性能

介绍NBR／PVC共混物的共混工艺和性能。NBR／PVC共混物共混工艺主要有乳液共沉法和机械共混法，其中乳液共沉法共混物性能较好，机械共混法操作简单、成本较低。影响共混物性能的因素主要有NBR的门尼粘度和丙烯腈含量、PVC品种、NBR／PVC共混比、共混温度以及PVC在共混物中的分散程度等。     

影响氯磺化聚乙烯/丁腈橡胶共混物耐热老化性能的因素

研究了氯磺化聚乙烯(CSM)和丁腈橡胶(NBR)的共混比、硫黄用量、炭黑、防老剂及软化剂诸因素对CSM/NBR共混物耐热老化性能的影响。结果表明,将CSM与NBR共混,可以改善NBR的耐热老化性能,当CSM/NBR共混比(质量比)为50/50时,耐热老化性能得到显著提高。适当减少硫黄用量,有利于保持较高的耐热老化性能,硫黄用量以0.25~0.75份为宜。炭黑用量对共混物的耐热老化性能有影响,随着炭黑N 550用量的增加,老化后的力学性能保持率先增加后减小。防老剂NBC的耐热老化效果较好。软化剂选用邻苯二甲酸二丁酯或邻苯二甲酸二辛酯时,CSM/NBR共混物具有较好的耐热老化性能。     

氯醚橡胶/丁腈橡胶橡胶共混物性能的研究

研究了共聚型氯醚橡胶／丁腈橡胶共混比、促进剂ＮＡ－２２用量、补强剂及软化剂对共混物性能的影响。结果表明：随着氯醚橡胶用量的增加，共混物的耐低温性、耐热氧老化性、耐油性及耐ＣＣｌ＿４和ＣＨＣｌ＿３性能提高，但拉伸强度降低；当促进剂ＮＡ－２２和半补强炭黑的用量分别为１．５和６０份时，氯醚橡胶／丁腈橡胶（６０／４０）共混物的拉伸强度及撕裂强度出现峰值；使用液体丁腈橡胶作软化剂．使共混物的耐低温性、回弹值、撕裂强度、扯断伸长率及耐油性提高，但耐热氧老化性及耐ＣＣｌ＿４和ＣＨＣｌ＿３性能降低。     

Homogeneous Styrene Butadiene/Acrylonitrile Butadiene Rubber Blends

The graft copolymerization of acrylonitrile (AN) onto butadiene rubber (BR) was carried out in toluene at 80°C, using dibenzoyl-peroxide (BPO) as initiator. The synthesized poly acrylonitrile-grafted-butadiene rubber (AN-g-BR) was characterized by N% elemental analysis and Fourier-transform infrared (FT-IR) spectroscopy. Styrene butadiene rubber/acrylonitrile butadiene rubber (SBR/NBR) blends were prepared with different blend ratios in presence and absence of AN-g-BR, where the homogeneity of such blends were examined with intrinsic viscosity (η) measurements, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The scanning electron micrographs illustrate disappearance of the macro-scale phase separation of SBR/NBR rubber blend as a result of the incorporation of AN-g-BR into that blend. Viscosity measurements confirm homogeneity of that blend. Differential Scanning Calorimetry traces exhibit shifts in glass transition temperatures (T _g's) of SBR and NBR in their blend, indicating some degree of homogeneity. Physico-mechanical properties of the rubber blend vulcanizates with different blend ratios, in presence and absence of AN-g-BR, were investigated before and after accelerated thermal aging. The SBR/NBR (25/75) homogeneous blend possessed the best physico-mechanical properties after thermal aging, together with the best swelling behavior in motor oil. The physico-mechanical properties of SBR/NBR (25/75) filled blend with different types of inorganic fillers during thermal aging were studied.     

Mechanical Properties and Thermooxidative Aging of a Ternary Blend,Pvc/Enr/Nbr,Compared with the Binary Blends of Pvc

In the quest to improve the thermooxidative aging of the poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) blend, nitrile rubber (NBR) was incorporated into the blend to yield a ternary blend of PVC/ENR/NBR. A Brabender Plasticorder with a mixing attachment was used to perform the melt mixing at 150°C and 50 rpm followed by compression molding. The mechanical properties, dynamic mechanical properties, and thermooxidative aging behavior of the ternary blend were compared with those of the binary blends (i.e., PVC/ENR and PVC/NBR). It was found that the ternary blend exhibits mechanical properties which are superior to those of PVC/ENR. A single glass transition temperature (T _g) obtained from dynamic mechanical analysis coupled with synergism in the modulus and some other mechanical properties indicate that PVC, ENR, and NBR form a single phase (miscible system) in the ternary blend. Di-2-ethyl hexylphthalate (DOP) plasti-cizer improves the aging resistance of the blends generally, whereas the presence of CaCO₃ as a filler only imparts minor influences on the properties and aging resistance of the blends.     

Improvement of the homogeneity of SBR/NBR blends using polyglycidylmethacrylate‐g‐butadiene rubber

Polyglycidylmethacrylate grafted butadiene rubber (PGMA‐g‐BR) was synthesized by a graft solution copolymerization technique. The PGMA content was determined through titration against HBr. The PGMA‐g‐BR was blended with styrene butadiene rubber/butadiene acrylonitrile rubber (SBR/NBR) blends with different blend ratios. The SBR/NBR (50/50) blend was selected to examine the compatibility of such blends. Compatibility was examined using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and viscosity measurements. The scanning electron micrographs illustrate the change of morphology of the SBR/NBR rubber blend as a result of the incorporation of PGMA‐g‐BR onto that blend. The T_gs of SBR and NBR in the blend get closer upon incorporation of PGMA‐g‐BR 10 phr, which indicates improvement in blend homogeneity. The intrinsic viscosity (η) versus blend ratio graph shows a straight‐line relationship, indicating some degree of compatibility. Thermal stability of the compatibilized and uncompatibilized rubber blend vulcanizates was investigated by determination of the physicomechanical properties before and after accelerated thermal aging. Of all the vulcanizates with different blend ratios under investigation, the SBR/NBR (25/75) compatibilized blend possessed the best thermal stability. However, the SBR/NBR (75/25) compatibilized blend possessed the best swelling performance in brake fluid. The effect of various combinations of inorganic fillers on the physicomechanical properties of that blend, before and after accelerated thermal aging, was studied in the presence and absence of PGMA‐g‐BR. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1559–1567, 2006     

过氧化物动态硫化的NBR/POM共混物性能的研究

采用过氧化物硫化体系用动态硫化方法制备了丁腈橡胶／聚甲醛（ＮＢＲ／ＰＯＭ）热塑性弹性体。研究了硫化体系、橡塑比对共混物性能的影响。实验结果表明．采用２，５－二甲基－２，５－双（叔丁基过氧基）己烷硫化体系硫化效果较好．共混物的综合性能优异；随着ＰＯＭ用量增加．共混物的拉伸强度略有增加，表观粘度降低，加工性能变好，电绝缘性能、老化性能和耐油性能均得到明显改善。     

Properties and morphologies of elastomer blends modified with EPDM‐g‐poly[2‐dimethylamino ethylmethacrylate]

The graft copolymerization of 2‐dimethylamino ethylmethacrylate (DMAEMA) onto ethylene propylene diene mononer rubber (EPDM) was carried out in toluene via solution polymerization technique at 70°C, using dibenzoyl peroxide as initiator. The synthesized EPDM rubber grafted with poly[DMAEMA] (EPDM‐g‐PDMAEMA) was characterized with ¹H‐NMR spectroscopy, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The EPDM‐g‐PDMAEMA was incorporated into EPDM/butadiene acrylonitrile rubber (EPDM/NBR) blend with different blend ratios, where the homogeneity of such blends was examined with scanning electron microscopy and DSC. The scanning electron micrographs illustrate improvement of the morphology of EPDM/NBR rubber blends as a result of incorporation of EPDM‐g‐PDMAEMA onto that blend. The DSC trace exhibits one glass transition temperature (T_g) for EPDM/NBR blend containing EPDM‐g‐PDMAEMA, indicating improvement of homogeneity. The physico‐mechanical properties after and before accelerated thermal aging of the homogeneous, and inhomogeneous EPDM/NBR vulcanizates with different blend ratios were investigated. The physico‐mechanical properties of all blend vulcanizates were improved after and before accelerated thermal aging, in presence of EPDM‐g‐PDMAEMA. Of all blend ratios under investigation EPDM/NBR (75/25) blend possesses the best physico‐mechanical properties together with the best (least) swelling (%) in brake fluid. Swelling behavior of the rubber blend vulcanizates in motor oil and toluene was also investigated. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

丁腈橡胶/聚甲醛共混物动态硫化的研究

采用２４０２树脂硫化体系以动态硫化方法制备了了腈橡胶（ＮＢＲ）／聚甲醛（ＰＯＭ）热塑性弹性体。研究了丙烯睛含量、硫化体系、橡塑比等对共混物性能的影响。实验结果表明：ＮＢＲ中丙烯睛含量增加，共混物的拉伸强度显著提高；随着ＰＯＭ用量增加，共混物的强度略有提高，表观粘度降低，加工性能改善，电性能、老化性能和耐油性能均得到明显提高。ＤＳＣ分析表明，共混物中ＰＯＭ的结晶度明显比纯ＰＯＭ低，熔点也有所下降。     

EVM/NBR动态硫化共混物性能的研究

研究了橡胶型乙烯醋酸乙烯酯共聚物（ＥＶＭ）／ＮＢＲ共混比、硫黄和叔丁基酚醛树脂（２４０２树脂）硫化体系对共混物性能的影响，并对比了动态硫化和静态硫化共混物在性能上的差异。试验结果表明，ＥＶＭ／ＮＢＲ共混比显著影响共混物的力学性能，而采用ＮＢＲ预先动态硫化的方法后，共混物胶料的挤出口型膨胀率明显减小，老化性能得到改善，同时减弱了硫黄和２４０２树脂等硫化体系对ＥＶＭ硫化的影响，使多种硫化体系可以共存于共混物中。ＤＳＣ分析表明ＥＶＭ／ＮＢＲ动态硫化共混物只有一个玻璃化温度，且介于ＥＶＭ和ＮＢＲ之间，说明ＥＶＭ和ＮＢＲ具有良好的相容性。