中文摘要：

采用逐步等温结晶分级法对高反式-1,4-丁二烯-异戊二烯共聚橡胶（TBIR）进行分级并对各级份进行了结构与组成表征.结果表明,TBIR-20为丁二烯单元无规分布、异戊二烯嵌段形成结晶的共聚物,TBIR-40为含TPB嵌段、TPI嵌段的共聚物;TBIR应用于轮胎子口护胶,可使混炼胶结晶度、格林强度和硬度增大,硫化速度加快;含TBIR的共混硫化胶的其他性能保持不变,压缩温升显著降低,耐磨耗性能和耐老化性能明显提高;DMA结果表明NR与TBIR的相容性优于BR,TEM结果表明并用TBIR后硫化胶中炭黑分散性更好.在轿车子午线轮胎子口护胶中应用20份左右的TBIR,其他力学性能保持在较高水平的同时,耐磨性、耐曲挠和耐老化性能显著提高,压缩温升明显降低.

英文摘要：

The fractionation of trans-1,4-poly（butadiene-co-isoprene） copolymer rubbers （TBIR） was carried out by stepwise isothermal crystallization fractionation method, and the structure and composition of the TBIR fractions were studied. It was found that TBIR-20 was a semi-crystalline copolymer with long trans-1,4- polyisoprene （TPI） blocks and butadiene units randomly distributed in the molecular chain. While TBIR-40 was a copolymer containing TPI blocks and trans-1,4-polybutadiene （TPB） blocks. The application of TBIR as hump strip stocks in passenger car radical （PCR） tires was investigated. The NR/BR/TBIR compounds showed improved green strength, crystallinity and shore A hardness, as well as accelerated curing rate. For NR/ BR/TBIR vulcanizates, physical and mechanical properties, such as tensile strength, tear strength, modulus and resilience stand in a high level, outstanding properties including decreased heat built- up, improved abrasion resistance and ageing- resistant performance, and excellent flexing fatigue properties were observed with the incorporation of TBIR. DMA tests showed that NR has a better compatibility with TBIR compared with BR. TEM results showed a good dispersion of carbon black in NR/BR/TBIR vulcanizates. So NR/BR/TBIR vulcanizates with about 20 phr TBIR showed satisfied mechanical properties, improved abrasion and ageing resistance, especially excellent dynamic properties like low heat built- up and very high flexing fatigue- resistance.