Kim Donghyuk, Ahn Byungkyu, Kim Kihyun, Lee JongYeop, Kim Il Jin, Kim Wonho
School of Chemical Engineering, Pusan National University, Busan 46241, Korea.
Hankook Tire & Technology Co., Ltd., R&D Center, 50 Yuseong-daero 935beon-gil, Yuseong-gu, Daejeon 34127, Korea.
Polymers (Basel). 2021 Mar 10;13(6):850. doi: 10.3390/polym13060850.
Liquid butadiene rubber (LqBR) which used as a processing aid play a vital role in the manufacturing of high-performance tire tread compounds. However, the studies on the effect of molecular weight, microstructure, and functionalization of LqBR on the properties of compounds are still insufficient. In this study, non-functionalized and center-functionalized liquid butadiene rubbers (N-LqBR and C-LqBR modified with ethoxysilyl group, respectively) were synthesized with low vinyl content and different molecular weights using anionic polymerization. In addition, LqBR was added to the silica-filled SSBR compounds as an alternative to treated distillate aromatic extract (TDAE) oil, and the effect of molecular weight and functionalization on the properties of the silica-filled SSBR compound was examined. C-LqBR showed a low Payne effect and Mooney viscosity because of improved silica dispersion due to the ethoxysilyl functional group. Furthermore, C-LqBR showed an increased crosslink density, improved mechanical properties, and reduced organic matter extraction compared to the N-LqBR compound. LqBR reduced the glass transition temperature (T) of the compound significantly, thereby improving snow traction and abrasion resistance compared to TDAE oil. Furthermore, the energy loss characteristics revealed that the hysteresis loss attributable to the free chain ends of LqBR was dominant.
用作加工助剂的液体丁二烯橡胶（LqBR）在高性能轮胎胎面胶的制造中起着至关重要的作用。然而，关于LqBR的分子量、微观结构和功能化对胶料性能影响的研究仍然不足。在本研究中，采用阴离子聚合法合成了低乙烯基含量和不同分子量的非功能化和中心功能化液体丁二烯橡胶（分别为用乙氧基硅烷基改性的N-LqBR和C-LqBR）。此外，将LqBR作为处理过的馏出芳烃抽提物（TDAE）油的替代品添加到填充白炭黑的SSBR胶料中，并研究了分子量和功能化对填充白炭黑的SSBR胶料性能的影响。由于乙氧基硅烷基官能团改善了白炭黑的分散性，C-LqBR表现出较低的Payne效应和门尼粘度。此外，与N-LqBR胶料相比，C-LqBR表现出更高的交联密度、更好的力学性能和更低的有机物抽出量。LqBR显著降低了胶料的玻璃化转变温度（T），因此与TDAE油相比，提高了雪地抓地力和耐磨性。此外，能量损失特性表明，LqBR自由链端引起的滞后损失占主导地位。
