EVOH基梳型聚合物的合成和表征

Synthesis and Characterization of EVOH-based Comb Polymer

以乙烯-乙烯醇共聚物(EVOH)为原料,在乙醇钠的催化作用下,通过与环氧乙烷(EO)的反应,合成出侧链为醚链结构且端基为羟基的梳型聚合物.采用红外光谱(IR)、核磁共振波谱(NMR)、凝胶渗透色谱(GPC)法对梳型聚合物的结构及其分子量进行了表征.讨论了EVOH与EO摩尔配比(r)和催化剂对接枝反应速度、接枝度、接枝长度、粗产率、分子量及其分子量分布的影响.结果表明:增加催化剂的用量有利于环氧乙烷的转化率提高,接枝反应速度明显增加;随着r的减少,EVOH的接枝度增加,侧链上接枝EO的数目逐渐变大,而产物的粗产率变化不大,均为35%左右.

Poly（ ethylene - co - vinyl alcohol） （EVOH） - based comb polymer was synthesized from poly（ ethylene- co -vinyl alcohol）（EVOH） and ethylene oxide （EO） with the catalyst of sodium ethylate. The side chain of the comb polymer is polyalkylene oxide end - capped with hydroxyl group. The graft copolymers were characterized by IB, NMR, and GPC. The influence of r on reaction rate, grafting degree, graft length, molecule mass and distribution are discussed. The results show that the reaction rate and the conversion rate of EO increase rapidly with the catalyst increasing; The graft degree of EVOH increases and the quantity of EO grafted on side chains developes when the content of EO increase, while the gross yield maintained at about 35%.