骨架可水解的具核超支化聚缩醛的合成与表征  

SYNTHESIS AND CHARACTERIZATION OF CORE-CONTANING HYPERBRANCHED POLYACETALS WITH HYDROLYSABLE BACKBONE

作　　者：卢毅[1] 金玉存[1] 曹墨源[1] 於麟[1] 熊晗[1] 王利群[2] 蒋宏亮[2] 

机构地区：[1]浙江大学高分子系,杭州310027 [2]浙江大学教育部高分子合成与功能构造重点实验室,杭州310027

出　　处：《高分子学报》2013年第3期391-397,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21074112)资助项目

摘　　要：通过AB2型聚合单体4-(2-羟基乙氧基)苯甲醛二甲缩醛与B2型核分子苯甲醛二甲缩醛的缩醛转移聚合反应,反应过程中不断排出低沸点的醇,合成了具核、骨架可水解的超支化聚缩醛(HBPAs).实验表明,HBPAs的分子量,多分散性和聚合度随着核比例的改变发生明显的变化.增加核比例,聚合物的分子量,多分散性和聚合度均降低.HBPAs在弱酸性条件下,骨架发生水解,生成4-(2-羟基乙氧基)-苯甲醛.研究发现,核比例对于聚合物降解速率有明显的影响,增加核比例,聚合物的降解速率加快.这表明,通过加入核分子,可以在一定程度上调控超支化聚缩醛的结构与性能.Core-containing backbone hydrolysable hyperbranched polyacetals （HBPAs） were synthesized via the transacetalization polymerization process between a AB2 type monomer （2-（4-（ dimethoxymethyl）- phenoxy） ethanol） and a B2 type core （benzaldehyde dimethyl aeetal）. By continuously removing the alcohol with lower boiling point, the reaction moves toward the direction of polymerization. The molecular weight and polydispersity could be modulated by varying the core feed ratio. Higher core feed ratio led to lower molecular weight and polydispersity. Under weak acidic conditions,the backbone of the polymer broke down and yielded 4-（2-hydroxyethoxy）-benzaldehyde as the final degradation product. The experiments showed that their hydrolysis rates were also obviously affected by the core content in the hyperbranehed polyaeetals. Increasing core feed ratio can accelerate the hydrolysis rate. By introducing core molecules, the structure and properties of hyperbranched polyaeetals can be controlled to a certain extent.

关 键 词：缩醛转移聚合 超支化聚缩醛 骨架可水解 

分 类 号：O631.3[理学—高分子化学]