Polymerization of t-butyl acrylate using organoaluminum complexes and correlation between main-chain tacticity and glass transition temperature of the obtained polymers
Polymerization of t-butyl acrylate using organoaluminum complexes and correlation between main-chain tacticity and glass transition temperature of the obtained polymers
复制标题
有机铝配合物聚合丙烯酸叔丁酯及其所得聚合物主链立构规整度与玻璃化转变温度的相关性
DOI：
10.1016/s0032-3861(99)00669-2
复制
发表时间：
2000
期刊：
影响因子：
4.6
通讯作者：
Y. Okamoto
中科院分区：
文献类型：
--
作者：
Weihong Liu;T. Nakano;Y. Okamoto
丙烯酸叔丁酯（tBA）的聚合用三乙基铝-（-）-鹰爪豆碱、三乙基铝-叔膦、三乙基铝-n-BuLi和双（2，6-二叔丁基-4-甲基苯酚盐）甲基铝-t-BuLi络合物在甲苯中进行。用1H NMR分析表明，用这些引发剂得到的聚tBA富含间同立构二联体。基于使用三乙基铝-（-）-金雀花碱和三乙基铝-n-BuLi得到的聚（tBA）的三单元和四单元立体化学信息，发现聚合反应服从伯努利统计。用差示扫描量热法（DSC）测定了聚（tBA）的玻璃化转变温度。间同立构聚（tBA）（外消旋（r）二联体含量：65%）和全同立构聚（r=19%）表现出比无规立构聚（tBA）（r = 50%，Tg=21° C）更高的玻璃化转变温度（分别为50和43°C）。
The polymerization of tert-butyl acrylate (tBA) was performed with triethylaluminum-(−)-sparteine, triethylaluminum–tertiary phosphine, triethylaluminum–n-BuLi and bis(2,6-di-tert-butyl-4-methylphenoxide)methylaluminum–t-BuLi complexes in toluene. The poly(tBA)s obtained with these initiators were rich in syndiotactic diad as observed by1H NMR analysis. On the basis of the triad and tetrad stereochemical information of the poly(tBA)s obtained using triethylaluminum-(−)-sparteine and triethylaluminum–n-BuLi, the polymerization reactions were found to obey Bernoullian statistics. Glass transition temperatures of the poly(tBA)s were measured by differential scanning calorimetry (DSC). A syndiotactic poly(tBA) (racemo (r) diad content: 65%) and an isotactic one (r=19%) exhibited higher glass transition temperature (50 and 43°C, respectively) than an atactic one (r =50%, Tg=21° C ).
影响因子：
3.2
作者：
T. Kitayama;T. Shinozaki;Eiji Masuda;Masanori Yamamoto;K. Hatada
通讯作者：
T. Kitayama;T. Shinozaki;Eiji Masuda;Masanori Yamamoto;K. Hatada