纤维素醋酸酯接枝己内酯的聚合研究

以冰醋酸为溶剂,浓硫酸为催化剂,将取代度为2 4的二醋酸纤维素水解为取代度为1 4的醋酸纤维素(CA)。以此醋酸纤维素为接枝骨架,ε 己内酯(ε CL)为接枝单体,在辛酸亚锡的引发下,合成了醋酸纤维素/聚己内酯接枝共聚物(CA g PCL)。研究了反应物纯度、原料配比、引发剂与单体摩尔比、反应时间、反应温度对单体转化率(C%)、接枝率(G%)、接枝效率(GE%)的影响。结果表明,当反应温度为140℃,单体ε 己内酯与醋酸纤维素的质量比为4∶1,引发剂辛酸亚锡与单体ε 己内酯的摩尔比为0 005,反应时间为16h,C%,GE%和G%分别为46 8%,65 2%和122 1%。

Study of the Graft Polymerization of ε-Caprolactone onto Cellulose Acetate

Cellulose acetate (DS=1.4) was firstly prepared by hydrolyzing cellulose diacetate (DS=2.4) in the presence of glacial acetic acid using concentrated sulfuric acid as catalyst,and then a novel graft copolymer was obtained from ring-opening copolymerization of ε-caprolactone with cellulose acetate using Sn(Oct)_2 as initiator.Effects of the purity of reactants,feed ratio,molar ratio of initiator to monomer,reaction time and reaction temperature on monomer conversion (C%),graft ratio (G%) and graft efficiency (GE%) were investigated.When the weight ratio of ε-caprolactone to cellulose acetate is 4∶1,molar ratio of Sn(Oct)_2 to ε-caprolactone is 0.005,and the graft polymerization was carried out at 140 ℃ for 16 h,C%,G%,GE% could approach 46.8%,65.2% and 122.1% respectively.