聚乙二醇-聚硅氧烷哑铃形嵌段共聚物的合成与表征

金属钾和聚乙二醇1000在THF中反应生成醇钠,再加入环氧氯丙烷得到环氧基端基的聚乙二醇,经水解,重复以上步骤,分别得到了具有4和8羟基端基的聚乙二醇中间体。将不同数目羟基端基聚乙二醇和KOH、D4在100℃～140℃条件下进行开环聚合,即得具有线性-树状结构的聚乙二醇-聚硅氧烷哑铃形共聚物。用核磁共振、凝胶渗透色谱和原子力扫描电镜对所得共聚物的结构、性能及其在亲水表面的排列方式作了详细研究。结果表明,4和8羟基端基聚乙二醇的羟基官能度分别为3.96和7.70;共聚物的绝对数均分子量分别为4300g/mol、4700g/mol和5900g/mol;哑铃形共聚物在亲水介质表面可形成形态学不均一、表面较为粗糙的硅膜。

Synthesis and Characterization of Poly(Ethylene Glycol)-Polysiloxane Barbell-Like Block Copolymers

Multi-hydroxyl end-groups poly(ethylene glycol) (PEG) was prepared from PEG and epichlorohydrin,then PEG-supported polydimethylsiloxane (PDMS)n-PEG-(PDMS)n (n=1,2,4) linear-dendritic barbell-like copolymers were synthesized through ring-opening polymerization. Arm numbers were varied with 2,4 and 8 by using bis-,tetra-,and octa-hydroxyl end-groups PEG,respectively. The results of characterization indicate that the hydroxyl functionality of tetrahydroxyl and octahydroxyl poly(ethylene glycol) is 3.96 and 7.7...