SSBR/TPI共混体系中TPI的结晶、成核及动力学研究  

Crystallization,Nucleation and Kinetics of TPI in SSBR/TPI Blends

作　　者：任惠成 武营飞 刘丹丹 聂华荣 贺爱华[1] REN Huicheng;WU Yingfei;LIU Dandan;NIE Huarong;HE Aihua(Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Rubber-Plastics, Ministry of Education, School of Polymer Science and Engineering, Qingdno University of Science and Technology, Qingdao 266042, Chin)

机构地区：[1]山东省烯烃催化与聚合重点实验室橡塑材料与工程教育部重点实验室青岛科技大学高分子科学与工程学院,青岛266042

出　　处：《高等学校化学学报》2018年第5期1091-1097,共7页Chemical Journal of Chinese Universities

基　　金：国家重点基础研究发展计划项目[批准号:2015CB654700(2015CB354706)];国家自然科学基金(批准号:51473083;51773105);山东省重大基础研究项目(批准号:ZR2017ZA0304);山东省自然科学基金(批准号:ZR2016EMM05);泰山学者工程;黄河三角洲学者工程专项经费资助~~

摘　　要：研究了不相容共混体系溶聚丁苯橡胶(SSBR)/反式-1,4-聚异戊二烯(TPI)共混体系的结晶行为.当SSBR含量较低时,SSBR/TPI共混物的成核密度降低,晶体生长速率降低,等温结晶速率降低,非等温结晶峰移向低温,SSBR抑制了α-TPI的生成,SSBR/TPI共混体系总结晶度降低,但TPI的相对结晶度升高,结晶行为与热力学相容的结晶/非晶共混体系一致;当SSBR含量较高时,随着SSBR含量增加,体系的成核密度增加,球晶的生长速率显著降低,SSBR显著抑制了α-TPI的生成,共混体系以β晶为主.Crystallization behavior including polymorphic behavior,nucleation density,crystal growth rate,kinetics of isothermal and non-isothermal crystallization in the immiscible solution polymerized styrenebutadiene rubber（ SSBR）/trans-1,4-polyisoprene（ TPI） blends were investigated by polarized optical microscopy（ POM）,wide angel X-ray diffraction（ WAXD） and differential scanning calorimeter（ DSC）. The results show that less than 40%（ mass fraction） of SSBR admixing with TPI brings about the suppressed nucleation and crystal growth rate of TPI. The overall crystallinity declines with the addition and increase of amorphous SSBR content,the normalized crystallinity of TPI,however,increases due to the decreased crystallization rate,resulted from the dilution of SSBR components,in turns the reduced equilibrium melting points and the lower undercooling. Additionally,the amorphous component SSBR depresses the formation ofα-TPI crystal while enables the formation of β-TPI crystal. Both the reduced crystallization rate of TPI during the isothermal crystallization and the lower crystallization temperature of TPI during non-isothermal crystallization were observed with the increase of SSBR content. All these results are in line with the crystallization behavior of the miscible amorphous/crystalline polymer blends because of the neglectable phase separation arising from the high viscosity of both rubber components leading to the slow dynamic of molecules.However,as the content of SSBR reached a high level,the nucleation density of the system increased with SSBR content increasing due to the phase separation exerting its influence on TPI crystallization.

关 键 词：溶聚丁苯橡胶/反式-1 4-聚异戊二烯(SSBR/TPI)共混体系 结晶行为 结晶动力学 

分 类 号：O631[理学—高分子化学]