基于点击反应大分子紫外线吸收剂的合成及在EVA中的应用  

Synthesis of Click Reactive Macromolecular UV Absorbers and Their Applications in EVA

作　　者：于淑娟 罗振静 陆树文 杨芳 郑广俭 Shujuan Yu;Zhenjing Luo;Shuwen Lu;Fang Yang;Guangjian Zheng(College of Chemistry and Materials Science , Guangxi Teachers Education University , Nanning 530001 , China)

机构地区：[1]广西师范学院化学与材料科学学院,广西南宁530001

出　　处：《高分子材料科学与工程》2019年第1期161-167,175,共8页Polymer Materials Science & Engineering

基　　金：广西高校中青年教师基础能力提升项目(KY2016YB282)

摘　　要：以巯基-烯点击化学反应的方法,制备了一种新型大分子紫外线吸收剂PHA-b-PEUV-0。通过红外光谱、核磁共振氢谱、紫外光谱对产物的结构进行了表征。利用ATR-FT-IR、拉伸强度保持率、接触角、邵氏硬度、X射线光电子能谱以及表面形貌研究了PHA-b-PEUV-0对乙烯-醋酸乙烯(EVA)材料的抗紫外加速老化性能,并与2,4-二羟基二苯甲酮(UV-0)的应用性能进行了对比研究。结果表明,EVA材料添加PHA-b-PEUV-0与UV-0紫外线吸收剂均可以起到一定的防御紫外加速老化的作用,但PHA-b-PEUV-0在抑制EVA材料表面含氧量与羰基指数增加、拉伸强度保持率及邵氏硬度降低等方面均优于UV-0。2种紫外吸收剂对EVA材料表面接触角的影响不同,添加PHA-b-PEUV-0的EVA材料表面接触角随老化时间的延长呈先减小后增大的交替变化趋势,添加UV-0的EVA材料的接触角随老化时间的延长呈先减小后增大的现象,但添加PHA-b-PEUV-0的EVA材料的接触角波动幅度较小。扫描电镜观察到空白EVA材料在老化20 d开始有凹陷出现,随老化时间的延长,凹陷结构逐渐增多。添加UV-0的材料表面从老化20 d开始有凹陷及碎屑状物析出,老化40 d后碎屑物增多,而添加PHA-b-PEUV-0的EVA材料在老化30 d后才出现少量的凸起结构,可见PHA-b-PEUV-0具有优于UV-0的综合抗紫外加速老化性能。A novel polyester UV absorber, PHA-b-PEUV-0,was prepared by thiol-ene click reaction. The structure of PHA-b-PEUV-0 was confirmed by 1 H-NMR,FT-IR, and UV spectrometric analyses. The anti-UV-accelerated aging performance of PHA-b-PEUV-0 added to EVA materials was studied by estimating the tensile strength retention,contact angle and Shore hardness,and by ATR-FT-IR,XPS,and SEM analyses. The obtained results were compared with those of EVA materials with added UV-0. The results show that the addition of PHA-b-PEUV-0 and UV-0 to EVA materials has a protective effect against UV-accelerated aging. However, PHA-b-PEUV-0 is better than UV-0 in suppressing the increase in oxygen content and carbonyl index of the surface of EVA materials,retaining the tensile strength, and decreasing the Shore hardness. The two UV absorbers have different effects on the contact angle of the EVA materials surface. The surface contact angle of the EVA materials added with PHA-b-PEUV-0 shows an alternating trend of first decreasing and then increasing with the UV aging time. The contact angle of the EVA materials with added UV-0 first decreases and then increases with UV aging time. However,the contact angle of the EVA materials with added PHA-b-PEUV-0 flue-tuate less. SEM analysis show that blank EVA materials begins showing a depression after 20d of UV aging. With the increase in aging time, the concave structure gradually increases. Pits and detritus appeare on the surface of the materials with added UV-0 after 20d of UV aging, and the amount of detritus increases after 40d of aging. However, in the EVA materials with added PHA-b-PEUV-0,only a small amount of raised structure is observed. It can be seen that PHA-b-PEUV-0 has acomprehensive anti-UV-accelerated aging performance that is superior to that of UV-0.

关 键 词：乙烯-醋酸乙烯材料 紫外线吸收剂 点击反应 紫外光老化 2 4-二羟基二苯甲酮 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业]