摘要
以叔丁基锂为引发剂,环己烷为溶剂,通过阴离子反应制备了窄分子量分布的聚苯乙烯-异戊二烯-苯乙烯三嵌段共聚物(SIS)。研究了叔丁基锂用量、反应时间及反应温度对SIS分子量(Mn)及分子量分布(Mw/Mn)的影响,得到了较优化的聚合工艺条件。采用核磁共振波谱(NMR)、傅里叶变换红外光谱(FT-IR)等方法对嵌段聚合物进行了表征和分析,并采用凝胶渗透色谱-多角度激光散射技术(SEC-MALLS)对其分子量及分子量分布进行了精确测定。利用差示扫描量热仪(DSC)研究了三嵌段共聚物的微观相分离结构,发现该三嵌段共聚物具有微观相分离结构,存在3个玻璃化转变温度,即苯乙烯嵌段相、异戊二烯嵌段相及苯乙烯/异戊二烯互溶过渡相。
Poly（styrene-isoprene-styrene） triblock copolymer （SIS） with narrow molecular weight distribution was prepared by anionic polymerization, using t-BuLl as initiator and cyclohexane as solvent. The influences of the amount of t-BuLl, polymerizing temperature and polymerizing time on the molecular weight （Mn） and molecular weight distribution （Mw/Mn） of SIS were studied to optimize the reaction conditions. The samples were characterized by nuclear magnetic resonance spectrscopy （NMR） and Fourier transform infrared spectrscopy （FT-IR）. The molecu- lar weight and molecular weight distribution of the samples were measured accurately by size exclusion chromatogra- phy-multi angle laser light scattering （SEC-MALLS）. The micro-phase separation structures of the triblock copolymers were investigated by differential scanning calorimetry （DSC）. It was found that the triblock copolyrner has the micro-phase separation structure and three glass transition temperatures, demonstrating that there are styrene block phase, conjugated isoprene block phase, and styrene/conjugated isoprene copolymer block phase in SIS.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2013年第12期67-70,85,共5页
Materials Reports
基金
国家发展和改革委员会2011年度中央预算内资金支持项目(JZAP12075-SL-042)
关键词
阴离子聚合
嵌段共聚物
叔丁基锂
anionic polymerization, block copolymer, tert-butyllithium
