共查询到20条相似文献,搜索用时 250 毫秒
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用独创的生态型纯可溶解的钠-镁有机化合物作催化剂,合成了不同乙烯基链段含量和不同分子量的3,4-聚异戊二烯橡胶(3,4-ПИ)。该橡胶的α'-转变温度接近室温。3,4-ПИ橡胶的热稳定性、气密性及弹性阻尼性能良好。不同分子量及不同微观结构的3,4-ПИ有良好的互溶性,由此可调节T'α。3,4-ПИ是颇有发展前途的新型阻尼材料、吸音材料和粘合材料,可用于航空、船舶和汽车制造业。 相似文献
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本文研究了由乳聚丁苯橡胶(苯乙烯含量为23.5%)作为母体聚合物,掺加溶聚异戊二烯橡胶(3,4-结构含量分别为40%,60%和75%),溶聚笨乙烯异戊二烯椽胶苯乙烯含量为23.5%和35%),以及具有不同苯乙烯含量和分子量的乳聚丁苯橡胶的并用胶料。从tan δ作为温度函数的测试,透射电子显微镜(TEM)、干、湿路面的抗滑性、皮克磨耗试验以及轮胎试验中发现,微观不相容并用胶(双峰宽tanδ)的性能优于具有相容性的并用胶,特别是在较宽温度范围内,它改善了干路面的抗滑性能,并能获得更好的湿路面抗滑性能与皮克耐磨耗性能之间的平衡。我们发现,并用胶的最佳组成是乳聚丁苯橡胶与3,4-结构为60%的聚异戊二烯橡胶之比为80/20。 相似文献
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<正>3世界聚异戊二烯橡胶的供需现状及发展前景3.1生产现状第二次世界大战期间,由于天然橡胶供不应求,促进了聚异戊二烯橡胶的研究和开发。1954年美国固特里奇公司用Ziegler引发剂合成了顺式-1,4-结构达98%的聚异戊二烯橡胶,1955年凡事通轮胎和橡胶公司用锂系引发剂合成了顺式-1,4-结构 相似文献
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聚异戊二烯橡胶(简称异戊橡胶,IR)是由异戊二烯通过溶液聚合制得的一种重要合成橡胶胶种,因其分子结构与天然橡胶(NR)相同,故又俗称合成天然橡胶。异戊橡胶具有优异的综合性能,凡是使用天然橡胶的橡胶制品,都可以使用异戊橡胶。在载重轮胎制造中可以完全替代天然橡胶,还可以广泛用于生产帘布胶、输送带、机械制品、胶管、胶带、海绵、胶粘剂、电线电缆、运动器械、医用材料以及胶鞋等。它可以单独使用,也可以与天然橡胶或其他合成橡胶并用。按其微观结构,聚异戊二烯橡胶可以分为顺式1,4聚异戊二烯橡胶、反式1,4聚异戊二烯橡胶、3,4聚异戊… 相似文献
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正由中国科学院长春应用化学研究所申请的专利(公开号CN 104479073A,公开日期2015-04-01)"具有核壳结构的聚异戊二烯橡胶合金及其制备方法",提供了聚异戊二烯橡胶合金的制备方法:将异戊二烯、二异丁基(2,6-二叔丁基苯酚)铝和主催化剂混合后进行预聚反应,0.5~5 h后加入丁二烯进行聚合反应,得到具有核壳结构的聚异戊二烯橡胶合金。该主催化剂包含氯化镁 相似文献
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《塑料、橡胶和复合材料》2013,42(7):217-224
AbstractThis paper evaluates the ability of α,ω-alkanedithiols to cross-link high vinyl 3,4-polyisoprene rubber (represented by Isogrip) through the thiol-ene addition reaction and provides microstructural insights into where cross-linking takes place. The thiol-ene reactions are the hydrothiolation of a C?=?C bond, which can be initiated in a number of ways. It has been postulated that organic peroxides are very effective in initiating such cross-links and that α,ω-alkanedithiol-ene cross-linking of high vinyl 3,4-polyisoprene primarily takes place on the α-carbon of the unsaturated sites of the rubber chains. 相似文献
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改性五氯化钼催化剂合成3,4-聚异戊二烯 总被引:2,自引:0,他引:2
利用正辛醇改性五氯化钼催化体系催化异戊二烯聚合得到了3,4-聚异戊二烯。研究了n(Mo)/n(Ip)、n(Al)/n(Mo)、间甲酚用量等聚合条件对聚合活性和聚合产物相对分子质量的影响。利用红外对聚合物进行了表征,并且通过红外谱图研究了聚合温度对聚合物3,4-结构含量的影响。结果表明,改性五氯化钼催化得到的聚合产物与铁系低分子聚合物具有相近的3,4-结构含量(质量分数为55%~61%),并且3,4-结构含量随着聚合温度升高先升高后降低。对聚合物进行特性粘数和GPC的表征表明,合成的3,4-聚异戊二烯特性粘数为1.2~2,多分散系数小于3。 相似文献
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以钛酸丁酯、负载钛/复合铝(AlEt3/Al(i-Bu)3)组成的双组分钛催化体系引发异戊二烯(Ip)聚合,研究了n(AlEt3):n(Al(i-Bu)3)对聚合活性和特性黏数的影响。对聚合物进行溶解分离得到汽油可溶物和不可溶物,分别对汽油可溶物进行红外并且定量分析,对汽油不可溶物进行红外和DSC分析。结果显示,汽油不可溶物部分为反式-1,4-聚异戊二烯,汽油可溶物部分为3,4-聚异戊二烯,且3,4-结构含量及汽油可溶物的特性黏数随着AlEt3比例的提高而升高,而反式-1,4-聚异戊二烯的特性黏数则随着AlEt3量增加而下降。 相似文献
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Trans-polydiene rubber family as high-performance tire stock possessed excellent dynamic properties, including excellent anti fatigue, low rolling resistance, low heat buildup, good green strength, and low abrasion loss. Here, Reactor Granule Technology (RGT) was introduced into the field of synthetic rubber for the first time to produce trans-1.4-polyisoprene/trans-1,4-poly(butadiene-co-isoprene) rubber alloy, which showed significant improvement in rubber synthetic technologies and great development in abundance of trans-rubber family. A series of trans-polyisoprene alloys with excellent spherical morphology were successfully synthesized by using sequential multistage polymerization. The alloy was fractionated into four fractions by temperature-gradient fractionation, and the fractionation was analyzed by 1H NMR, 13C NMR, DSC and WAXD. 相似文献
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A new route to the synthesis of statistical networks similar to vulcanized rubber, from 1,2-polybutadiene (PBD) and 3,4-polyisoprene (PI) is described. The two antagonist chemical functions are both present on the polydiene backbone. The latter could be used as precursor polymer and as difunctional crosslinker simultaneously; the reactive groups are respectively the dimethylhydrogenosilane end groups and the pendent double bonds along the polydiene backbone. 相似文献
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A new technology to synthesize trans-1,4-polyisoprene (TPI) with bulk precipitation polymerization in the presence of a supported Ti catalysts was introduced. The termination of polymerization, stabilization of the polymer, and the adjustment of the molecular weight of TPI and its quality index are discussed. The blending and covulcanization of TPI with natural rubber (NR), styrene butadiene rubber (SBR), and butadiene rubber (BR) were studied. The blending compounds had outstanding dynamic mechanical properties, especially the rolling resistance, heat buildup, and wet skid resistance. Tread and sidewall compounds that contained TPI had a higher modulus, longer fatigue life, better abrasion resistance, lower rolling resistance, and lower buildup, which indicates that TPI is suitable for high-performance tire. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 81–89, 2001 相似文献
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正(续上期)4 TPI用于轮胎中问题和效益4.1问题从以上试验数据可以看出,TPI不仅可以部分替代NR在轮胎胶料中使用,还能显著提高轮胎性能。但TPI作为一种新材料,国内外胶料配合和加工的经验都不足,且TPI具有强烈结晶性,因此其应用还存在如下问题。(1)炼胶。TPI从结晶熔融到分散需要一定的温度和时间,传统的开炼温度和密炼时间都难以保证TPI在胶料中充分分散,以至于TPI的优点表 相似文献
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A series of symmetrical triblock copolymers containing crystallizable high-trans-1,4-polybutadiene (HTPB) were synthesized by sequential anionic polymerization of 1,3-butadiene (Bd) with isoprene (Ip) (or
styrene (St)) using barium salt of di(ethylene glycol) ethyl ether/triisobutylaluminium/dilithium (BaDEGEE/TIBA/DLi) as initiation
system. The microstructures of the symmetrical triblock copolymers were determined by IR, 1H NMR, and 13C NMR. The results indicated that polyisoprene-block-high-trans-1,4-polybutadiene-block-polyisoprene (IBI) contained HTPB segments and medium 3,4-polyisoprene (PI) segments, and polystyrene-block-HTPB-block-polystrene (SBS) contained HTPB and atatic-polystyrene (PS) segments. The DSC analysis revealed that SBS tended to phase separate but IBI did not. The cold crystallization
was observed in IBI but not in SBS. 相似文献