Stabilizer-free precipitation copolymerization of renewable bio-based -methylene--butyrolactone and styrene
Stabilizer-free precipitation copolymerization of renewable bio-based -methylene--butyrolactone and styrene
复制标题
可再生生物基-亚甲基-丁内酯与苯乙烯的无稳定剂沉淀共聚
DOI：
10.1080/10601325.2016.1189281
复制
发表时间：
2016
影响因子：
2.5
通讯作者：
Yang Wantai
中科院分区：
文献类型：
--
作者：
Ramram Majdi Basheer;Chen Dong;Ma Yuhong;Wang Li;Yang Wantai
以过氧化苯甲酰（BPO）为引发剂，α-亚甲基-γ-丁内酯（MBL）与苯乙烯（St）在乙酸异戊酯中于80°C进行无稳定剂沉淀共聚合。考察了单体配比、引发剂浓度、反应时间等因素对聚合物粒子尺寸和形貌的影响。结果表明，单体投料比对粒子形成过程有重要影响。当MBL与St的单体投料比为1：2时，形成了数均直径在785-2620 nm范围内的窄尺寸分布的球形聚合物粒子。研究了聚合物粒子的形成过程，以深入了解该反应体系的聚合过程。结果表明，聚（MBL-co-St）粒子的形成机理与常规沉淀聚合相似。在短的成核阶段（10 min）之后，聚合物颗粒的量保持恒定，并且颗粒生长主要来自于捕获新形成的聚合物链。采用FTIR、1H-NMR和DSC对产物的化学组成和热性能进行了表征。
Stabilizer-free precipitation copolymerization of α-methylene-γ-butyrolactone (MBL) and styrene (St) was carried out in isoamyl acetate with BPO as initiator at 80°C. The influence of monomer feed ratio, initiator concentration and reaction time on the size and morphology of the obtained polymer particle was investigated in details. It was found that the monomer feed ratio play an important role on the particle formation process. When the monomer feed ratio of MBL to St was 1:2, narrow size distributed spherical polymer particles were formed with number average diameters in the range of 785–2620 nm. The formation process of polymer particle was studied to get a deep insight into the polymerization process of this reaction system. It was found that the formation mechanism of the poly(MBL-co-St) particles was similar to that of conventional precipitation polymerization. After a short nucleation stage (10 min), the amount of polymer particles remained constant and the particle growth mainly came from the capturing of newly formed polymer chains. The chemical composition and thermal property of the poly(MBL-co-St) were fully characterized by FTIR,1H-NMR spectra, and DSC.