80电影天堂网,少妇高潮一区二区三区99,jαpαnesehd熟女熟妇伦,无码人妻精品一区二区蜜桃网站

相關鏈接
聯(lián)系方式
  • 通信地址:長春市人民大街5625號中科院長春應化所
  • 郵編:130022
  • 電話:85262773
  • 傳真:
  • Email:dmcui@ciac.ac.cn
當前位置:> 首頁 > 論文著作 > 正文
Ring-opening polymerization and block copolymerization of L-lactide with divalent samarocene complex
作者:Cui, DM;Tang, T;Bi, WG;Cheng, JH;,Chen, WQ;Huang, BT
關鍵字:ring-opening polymerization,copolymerization, block copolymers, catalysts, L-lactide, lanthanocene complexes
論文來源:期刊
具體來源:http://onlinelibrary.wiley.com/doi/10.1002/pola.10814/abstract;jsessionid=41B4E08AF8F394E927C3DE5757
發(fā)表時間:2003年
Divalent samarocene complex [(C5H9C5H4)2Sm(tetrahydrofuran)2] was prepared and characterized and used to catalyze the ring-opening polymerization of L-lactide (L-LA) and copolymerization of L-LA with caprolactone (CL). Several factors affecting monomer conversion and molecular weight of polymer, such as polymerization time, temperature, monomer/catalyst ratio, and solvent, were examined. The results indicated that polymerization was rapid, with monomer conversions reaching 100% within 1 h, and the conformation of L-LA was retained. The structure of the block copolymer of CL/L-LA was characterized by NMR and differential scanning calorimetry. The morphological changes during crystallization of poly(caprolactone) (PCL)-b-P(L-LA) copolymer were monitored with real-time hot-stage atomic force microscopy (AFM). The effect of temperature on the morphological change and crystallization behavior of PCL-b-P(L-LA) copolymer was demonstrated through AFM observation.