摘要
研究了以萘钠为引发剂 ,在淀粉乙酸酯上进行苯基缩水甘油醚 (PGE)、γ-丁内酯 (γ- BL)开环接枝聚合的反应。首先将淀粉进行部分乙酰化 ,制备取代度为 1.5的淀粉乙酸酯 ,之后以萘钠将淀粉乙酸酯的羟基转化为醇氧盐 ,再引发 PGE、γ- BL进行负离子开环接枝聚合。采用凝胶渗透色谱 (GPC)对接枝前后聚合物分子量的变化进行研究 ,并通过接枝率、1H- NMR波谱对淀粉 -聚 (苯基缩水甘油醚 )接枝共聚物(St- g- PPGE)进行了表征。结果表明 ,以萘钠为引发剂 ,PGE能够在淀粉乙酸酯上进行均相接枝聚合 ,接枝率在 70 %～ 15 0 %之间 。
Graft polymerization of phenyl glycidyl ether(PGE) and γ-butyrolactone(γ-BL) onto starch acetate was carried out through anionic ring-opening polymerization using naphthalene-sodium complex as initiator in polar solvent. To increase the reactivity of the hydroxyl groups, starch was partially acetylated and starch acetate with substituting degree (DS) nearly 1.5 was obtained. Using naphthalene-sodium as initiator, the -OH groups in the starch acetate were turned into -ONa groups, then the graft polymerization of PGE and γ-BL was initiated. The grafted copolymer, starch grafted poly(pheny1 glycidy1 ether)(St-g-PPGE), were characterized by 1H-NMR spectrum, grafting percentage, and gel permeation chromatography(GPC). The results show that naphthalene-sodium is an effective initiator and initiates the graft polymerization of PGE and γ-BL through the -OH groups. The grafting percentage is about 70%~150% and the molecular weight of the grafted polymer is much higher than that of the ungrafted starch acetate.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2003年第1期208-211,共4页
Polymer Materials Science & Engineering
