共查询到19条相似文献,搜索用时 46 毫秒
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研究了三辛基甲基氯化铵(MTAC)、三十二烷基三甲基氯化铵(TMAC)、十六烷基三甲基溴化铵(HTAB)、十八烷基三甲基溴化铵(OTAB)以及聚乙二醇(PEG-400)等5种相转移催化剂对苯乙烯-丁二烯-苯乙烯嵌段共聚物环氧化反应的影响.结果表明,MTAC的环氧化效果最好,当其质量分数为1.0%时,可使环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物(ESBS)的环氧基质量分数从18.1%提高到20.1%;HTAB和PEG-400有利于ESBS的环氧基质量分数的提高;而OTAB和TMAC由于自身较大的分子体积反而使ESBS的环氧基质量分数下降.傅里叶变换红外光谱分析表明,MTAC可以有效抑制环氧基开环副反应的发生. 相似文献
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氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物研究进展 总被引:1,自引:1,他引:1
概述了氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)国内外生产状况,介绍了SEBS生产工艺技术及其加氢催化剂的开发进展,提出应加强SEBS的改性及应用技术开发,在国内尽快实现SEBS的规模化工业生产。 相似文献
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用环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物制备季铵盐离聚体 总被引:1,自引:2,他引:1
用环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物的环氧基与叔胺盐酸盐在相转移催化剂存在下,通过开环反应制得了季铵盐离聚体,用过氯酸滴定法及核磁共振仪进行了表征。研究表明,该反应中环氧基的转化率可达到100%;反应产物为季铵盐离聚体,其在48h时的吸水率达到了115%。 相似文献
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研究了用环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物(ESBS)在相转移催化剂、开环催化剂存在下与Na2HPO4的水溶液发生开环反应,制得了磷酸盐离聚体。结果表明,在ESBS的浓度为0.14g/mL、Na2HPO4/环氧基(摩尔比)为1.8、Na3PO4/Na2HPO4(质量比)为0.6、溴化四乙基铵/ESBS(质量比)为0.05、N,N-二甲基苯胺/ESBS(质量比)为0.05以及聚合温度为75℃、反应时间为8h的条件下,反应转化率达32%。该离聚体具有很好的乳化性、一定的吸水性和耐油性,这些性质均与离子含量及离子电位有关。 相似文献
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用环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物(ESBS)在相转移催化剂、开环催化剂存在下与亚硫酸氢钠的水溶液进行开环反应制备了SBS磺化离聚体,用傅里叶变换红外光谱法对产物进行了表征。研究表明,当环氧基转化率达90%时,反应条件为ESBS的质量浓度0.12g/mL。NaHSO3/环氧基(摩尔比)1.8,促进剂/NaHSO3(质量比)0.36。四乙基澳化铵/ESBS(质量比)0.05,二甲基苯胺/ESBS(质量比)0.05,60℃,7h。 相似文献
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以环己烷为溶剂、正丁基锂为引发剂、环氧氯丙烷为偶联剂合成了极性官能化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS),研究了偶联剂用量、偶联反应的温度和时间及苯乙烯-丁二烯活性双嵌段聚合物(SB)的分子量对偶联反应的影响,以及偶联效率对极性官能化SBS力学性能的影响。结果表明,偶联效率随偶联剂用量增加和偶联温度升高而先升高后降低;随着SB数均分子量的增大,偶联效率逐渐降低。当偶联剂与正丁基锂的摩尔比为0. 6、偶联温度为80~90℃时偶联效率最大,可达80%以上,且偶联反应可在5 min内完成。极性官能化SBS的力学性能要优于市售线型SBS。 相似文献
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综述了苯乙烯-丁二烯-苯乙烯嵌段共聚物极性化在大分子化学改性和负离子原位聚合改性这两种方法中的研究进展,详细阐述了两种方法的技术手段及优缺点,并对极性化后SBS的应用进行简单概述. 相似文献
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Compatibility of poly(vinyl chloride) with epoxidized copolymers of butadiene-styrene 总被引:1,自引:0,他引:1
The compatibility of poly(vinyl chloride) (PVC) with epoxidized styrene-butadiene copolymers is examined at different levels of epoxidation. The copolymers modified were a random (SBR) containing 45 wt% styrene and a triblock (SBS) with 30 wt% bound styrene. Blends were examined in the complete composition range and the approximate levels of epoxidation to ensure blend miscibility were determined. Epoxidized SBS (ESBS) was more effective in miscibility compared with ESBR requiring a lesser degree of epoxidation (43 versus 46 mol%). Tensile properties of the ESBS/PVC blends showed the efficiency of ESBS as a polymeric plasticizer even at levels of epoxidation (ca. 35 mol%) where immiscibility sets in. 相似文献
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Purified, gel free butadiene-styrene copolymers were prepared by emulsion polymerization with butadiene contents of 80, 55 and 30 weight %. Radiation behavior of these materials at 30°C was independent of dose rate in the range 0.04-0.46 Mrad/hour and the scission-crosslinking ratio was about 0.40 for all copolymers and was independent of total dose. Extrapolated sol fractions at infinite dose, intrinsic viscosities of irradiated polymers and Mn in the pre-gel region gave mutually consistent estimates of this ratio. G(crosslink) was 3.4. At the relatively low doses studied, intra-molecular crosslinking was evident only with the high styrene content polymer. Active sites for intermolecular crosslinking are thought to be allylic to chain double bonds, whereas vinyl groupings may be involved in intramolecular crosslinking. 相似文献
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Graded block and randomized copolymers of butadiene-styrene were prepared anionically by polymerizing a mixture of butadiene and styrene with n-BuLi, in the absence and in the presence of t-BuOK respectively. Determination of the monomer composition and microstructure of the poly-butadiene sequence was achieved by 300 MHz 1H n.m.r. and infra-red spectroscopy. 1H n.m.r. equations developed previously for butadiene-styrene copolymers were modified and extended. In this way, cis, trans butadiene contents were determined from the aliphatic region of the n.m.r. spectra. The monomer sequence distribution of the copolymers has been investigated by examination of the morphology and their dynamic mechanical properties. The experimental conditions have been established for the preparation of random copolymers with inter- and intramolecular composition distribution. 相似文献
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采用烯烃复分解法将生物基腰果酚(CA)接枝到1,2-聚丁二烯橡胶(1,2-PB)上制备了苯酚官能化的液体1,2-PB(1,2-PB-g-CA)。结果表明,CA成功接枝到聚丁二烯上,并且在开放体系下可得到官能度大于10%的接枝产物。将1,2-PB-g-CA作为白炭黑填充的丁苯胶轮胎胎面胶配方体系的增塑剂可提高白炭黑在基体中的分散性。同时,此改性低聚物羟基的存在有利于增加白炭黑和橡胶基体的相互作用。且该硫化胶具有较低的滚动阻力和生热性能。 相似文献
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用丁苯橡胶改性乙烯焦油制备中间相沥青 总被引:1,自引:0,他引:1
用丁苯橡胶(SBR)与乙烯焦油在430℃、常压及惰性气体保护下进行共炭化,制备出各向异性中间相沥青,并对其进行了分析和表征.结果表明,由SBR改性乙烯焦油制得的中间相沥青与乙烯焦油直接炭化制得的中间相沥青相比,有序度高,黏度低,口树脂含量高,且具流线广域性组织结构. 相似文献