聚丁二烯丙烯酸酯液态光学透明胶的合成及其UV固化膜的性能

针对丙烯酸酯大单体在合成过程中常带有颜色,以及由其制备的液态光学透明胶的UV固化膜易黄变的问题,本文报道了一条新的大单体合成路线:首先以端羟基聚丁二烯(HTPB)、萘钾、丙烯酰氯(AC)为原料,通过一锅法合成了一种无色透明的聚丁二烯丙烯酸酯大单体(PBAM);然后将PBAM与丙烯酸酯活性稀释单体、光引发剂混合,制备了液态光学透明胶;最后通过UV固化制备了一系列无色透明的薄膜。利用GPC、1H-NMR、FTIR等手段对PBAM进行了表征;进一步研究了液态光学透明胶UV固化膜的光学性能、耐黄变性能、耐低温性能等。结果表明:基于新路线合成的PBAM呈现无色透明,液态光学透明胶的UV固化膜展现出优良的光学性能和耐黄变性能,固化膜透光率高达98%;经紫外线加速老化264h后,色差(ΔE)≤1.5;此外,该固化膜还具有优良的耐低温性能,玻璃化转变温度为-30℃。

Synthesis of Liquid Optical Clear Adhesive Based on Polybutadiene Acrylate Macromonomer and Properties of UV-cured Films Thereof

To solve the problems that the acrylate macromonomer is often colored during synthetic process and the UV-cured film of liquid optical clear adhesive prepared therefrom is easy to turn yellow,a new synthetic route is reported in this paper.A colorless and transparent polybutadiene acrylate macromonomer(PBAM)is synthesized in one-pot using hydroxyl-terminated polybudiene(HTPB),potassium naphthalene,and acryloyl chloride(AC)as raw materials.Subsequentially,liquid optical clear adhesive was prepared through blending PBAM,reactive diluent monomer,and photoinitiator.Finally,a series of colorless and transparent films were prepared through UV-curing process.The structure of PBAM was characterized by GPC,1H-NMR,and FTIR.The optical properties,yellowing resistance,low temperature resistance of UV-cured films were further studied.The results showed that a colorless and transparent PBAM was successfully synthesized by the new route.The UV-cured films of liquid optical clear adhesive exhibited excellent optical properties and yellowing resistance property.The transmittance of cured films was as high as 98%.After 264 hours of accelerated aging exposure to ultraviolet radiation,the color difference(ΔE)was below 1.5.In addition,the cured film also presented good low temperature resistance,and it’s glass transition temperature was as low as-30℃.