环氧树脂改性超支化聚酯的合成及性能

以偏苯三酸酐、环氧氯丙烷及甲基丙烯酸缩水甘油酯为原料合成了超支化聚酯(HBP),再通过超支化聚合物的羧基与环氧树脂环氧基的反应得到环氧改性超支化聚合物;用GPC1、H-NMR、DSC、TGA表征了环氧改性超支化聚合物的结构和热性能;比较了不同环氧树脂用量改性前后树脂的光反应活性以及光固化涂层的耐擦洗性和硬度,测定了凝胶率-曝光时间曲线;以环氧改性超支化聚合物配制了光刻胶,在混合光源以及接触曝光的条件下,分辨率达到2~3μm,且图像十分清晰,断面整齐。环氧树脂用量为HBP羧基物质量的70%左右时,改性的超支化聚酯的光固化活性有明显提高,力学性能得到明显改进。

Synthesis and properties of hyperbranched polyesters modified with epoxy resins

Hyperbranched polymers were functional materials with unique molecular structures,but they were generally weak in mechanical property.Thus modification of hyperbranched polymers with improved mechanical property would expand their applications.Hyperbranched polyesters(HBP)were synthesized by the ring-opening polymerization of trimellitic anhydride,epichlorohydrin and glycidol methacrylate,and then modified with epoxy resin through the reaction of the epoxy and the carboxy1 groups on the polyesters.The HBP modified with epoxy resin were characterized with GPC,1H-NMR,DSC and TGA.Photo reactivity of the resins,anti-scraching and hardness of the photocured coating composed of the HBP and the modified HBP were compared.The gel content vs photo-exposure time was determined.Photoresists composed of the modified HBP were prepared.Clear patterns with smooth surface and resolution reached to 2～3 μm were prepared through contact exposure with mixed UV light.The modification of HBP with about proper amount 70% of epoxy resin based the mole of the carboxyl group,showed obviously the improved photo reactivies and mechanical properties.