二苯甲酮类紫外吸收基聚硅氧烷的合成与表征

在铂催化剂作用下,用4-(3-烯丙氧基-2-羟基)丙氧基-2-羟基二苯甲酮(MUV-O)与含氢硅油(PHMS)在甲苯溶剂中的硅氢化加成反应,合成了一种侧链携带有二苯甲酮类紫外吸收基团的聚硅氧烷(PUVS i)。用红外光谱1、HNMR1、3CNMR、紫外光谱等对产物结构进行了表征。研究了合成反应条件,结果表明:当硅氢化反应温度为80~100℃,催化剂氯铂酸用量为原料总质量的(10~50)×10-6,m(MUV-O)∶m(PHMS)=16.4∶30时,产物PUVS i的接枝率可达91%。新合成的二苯甲酮类紫外吸收基聚硅氧烷PUVS i,对波长为243.2(吸光度A=0.797)、288.2(吸光度A=1.013)、325.4 nm(吸光度A=0.847)的紫外光有强吸收作用。

Synthesis and Characteristic of Polysiloxane with Ultraviolet Absorbing Groups of Benzophenone

In the presence of platinum catalyst,a polysiloxane with pending groups of derivative of benzophenone(PUVSi) is synthesized by hydrosilylation of 4-(3-allyloxy-2-hydroxy) propyloxy-2-hydroxybenzophenone(MUV-O) with polyhydromethylsiloxane(PHMS).The related chemical structure of the product is determined and characterized by IR,~1HNMR,~(13)CNMR and UV spectra.Optimum synthesis condition of PUVSi is investigated and researched.Experimental results indicate that when m(MUV-O)∶m(PHMS)=16.4∶30,and hydrosilylation temperature is maintained at 80～100 ℃ as well as the amounts of H_2PtCl_6 is in the range of(10～50)×10~(-6) based on the total weight of raw materials(PHMS and MUV-O),the grafting yield of the polysiloxane is over 91%.In addition,the new synthesized polysiloxane is proved to be an excellent UV-absorbing agent,exhibiting intensive ultraviolet absorption bands at wavelengths of 243.2 nm(absorbance A=0.797),288.2 nm(absorbance A=1.013) and 325.4 nm(absorbance A=0.847).