预辐照接枝法提高PVDF的紫外线吸收性能  

Study on Pre-irradiation Grafting Method to Improve Ultraviolet Absorption Property of PVDF

作　　者：董莉[1,2] 熊征蓉[1] 刘向东[1] 杨宇明[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022 [2]中国科学技术大学,合肥230026

出　　处：《工程塑料应用》2017年第1期23-28,共6页Engineering Plastics Application

摘　　要：采用有机合成方法制备反应型紫外线吸收剂2-羟基-4-(3-甲基丙烯酸酯基-2-羟基丙氧基)二苯甲酮(BPMA)。利用制得的BPMA,以聚偏氟乙烯(PVDF)粉体为基材,进行预辐照接枝反应,制得PVDF-g-BPMA。预辐照实验中PVDF的辐照剂量为15 k Gy,在流变仪中的熔融接枝反应温度为190℃,反应时间为6 min,转速为50 r/min。通过核磁共振氢谱、傅里叶变换红外光谱、差示扫描量热、广角X射线衍射以及紫外–可见光谱等对PVDFg-BPMA进行结构表征与紫外线吸收性能测试。结果表明,BPMA成功接枝到PVDF上,接枝率达7.04%。接枝后PVDF的结晶度降低,但晶型未发生改变。相比于未接枝的PVDF,PVDF-g-BPMA薄膜在280~340 nm波长内的紫外光透过率降至0.27%以下,表现出优异的紫外线吸收性能,同时与PVDF/BPMA复合膜相比,其经乙醇抽提48 h后的紫外线吸收性能没有明显变化,表明PVDF预辐照接枝BPMA有效防止了紫外线吸收剂在PVDF内的外迁移。Reactive ultraviolet absorber 2-hydroxy-4-（3-methacryloxy-2-hydroxylpropoxy）benzophenone （BPMA） was pre-pared through organic synthesis. Polyvinylidene fluoride （PVDF） powder was chosen as the base material,and grafted with the synthesized BPMA through pre-irradiation grafting polymerization method for preparing PVDF-g-BPMA. In the experiment of pre-irradiation, the radiation dose of PVDF was 15 kGy and melt grafting reaction was carried out at a temperature of 190℃ for 6 min with rotational speed of 50 r/min in rheometer. The structure and ultraviolet absorption property of PVDF-g-BPMA were character-ized by 1H–NMR,FTIR, DSC, WAXD and UV-vis. The results demonstrate that BPMA is successfully grafted into PVDF powder and the grafting ratio reaches 7.04%. After grafting, the crystallinity of PVDF powder decreases, but the crystal form is not changed. Compared with the ungrafted PVDF,the UV transmittance of PVDF-g-BPMA ？lm decreases to less than 0.27% in the wavelength range of 280–340 nm, which shows excellent ultraviolet absorption property through graft polymerization. What’ s more, compared with the PVDF/BPMA composite ？lm,the ultraviolet absorption property of PVDF-g-BPMA ？lm has no obvious change after ex-tracted by alcohol for 48 h, which indicates that pre-irradiation grafting method is an effective method to prevent migration of ultra-violet absorber in PVDF.

关 键 词：聚偏氟乙烯 预辐照接枝 2-羟基-4-(3-甲基丙烯酸酯基-2-羟基丙氧基)二苯甲酮 紫外线吸收 耐迁移 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]