含光敏剂184结构的超支化碱溶性感光聚合物的合成及性能

Synthesis and Photocuring Performance of Hyperbranched Base-soluble Photo-sensitive Polymers Containing Photo Sensitizer 184 Unit

以季戊四醇为“中心核”，通过与偏苯三酸酐，环氧氯丙烷反应合成超支化聚酯，利用合成聚合物分子外围的羧基与含环氧基的1-羟基环己基苯基酮、甲基丙烯酸缩水甘油酯反应合成分子末端含光敏剂结构的超支化碱溶性感光聚合物。聚合反应转化率在1h内可达80％以上；合成聚合物的玻璃化转变温度为200℃，200℃以内无失重，200～300℃之间有轻微失重，其粘度表现为超支化聚合物的粘度特性，并且在碱性水溶液中溶解性好，无需外加光敏剂，在紫外光照射下便可固化、交联，具有较小的凝胶曝光能量酥（1×10^-3-1×10^-2J／cm^2）和较好的光敏性。

Hyperbranched polyesters were synthesized by reacting the centronuclei of pentaerythritol with 1,2, d-benzenetricarboxylic anhydride and epichlorohydrin. Then the base-soluble photo-sensitive polymers containing photo-sensitizer units were prepared by further reaction of the above synthesized polymers with 1-hydroxy cyclohexyl-phenyl-ketone and glycidyl methacrylate. Under the optimum conditions, the monomer conversion could reach over 80% during 1 h of reaction. The glass transition temperature of the product was 200 ℃. TGA showed no mass loss at below 200 ℃ for the polymer, and a small mass loss was observed between 200 ℃ and 300 ℃. It viscosity performance was characteristic of hyperbranched polymers. Additionally, they show excellent solubilities in aqueous alkali. They could be photocured by UV irradiation without additional photoinitiators. Moreover, these resins have such merits as little exposing energy （E0 = 1 × 10^-3 - 1 × 10^-2 J/cm^2） and satisfactory photo sensitivity.