Synthesis and characterization of new UV absorbing microspheres of narrow size distribution by dispersion polymerization of 2-(2′-hydroxy-5′-methacryloxyethylphenyl)-2H-benzotriazole
Synthesis and characterization of new UV absorbing microspheres of narrow size distribution by dispersion polymerization of 2-(2′-hydroxy-5′-methacryloxyethylphenyl)-2H-benzotriazole
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DOI：
10.1016/j.polymer.2009.05.056
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发表时间：
2009-07
期刊：
影响因子：
4.6
通讯作者：
Jenny Goldshtein;S. Margel
中科院分区：
文献类型：
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作者：
Jenny Goldshtein;S. Margel
以甲基乙基酮为连续相，采用分散聚合法合成了2-（2′-羟基-5 ′-甲基丙烯酰氧乙基苯基）-2H-苯并三氮唑（商品名NORBLOC）紫外吸收微球，微球粒径在0.2±0.03 ~ 3.0±0.2μm之间。各种聚合参数，如单体浓度，引发剂的类型和浓度，稳定剂浓度和交联剂单体浓度，对尺寸和尺寸分布，并对所产生的PNORBLOC微球的聚合产率的影响已被阐明。通过将低密度聚乙烯与2%（w/w）直径为0.25±0.03μm的PNORBLOC微球熔融共混，然后在170-190 ℃下进行管状吹塑工艺，制备150±25μm厚度的聚乙烯/PNORBLOC树脂和膜。这些薄膜的紫外辐射（200- 390 nm）截止效率已被证明。
New UV absorbing microspheres of sizes ranging between 0.2±0.03 and 3.0±0.2μm were formed by dispersion polymerization of the monomer 2-(2′-hydroxy-5′-methacryloxyethylphenyl)-2H-benzotriazole (trade name: NORBLOC) in methyl ethyl ketone as a continuous phase. The effect of various polymerization parameters, such as monomer concentration, initiator type and concentration, stabilizer concentration and crosslinker monomer concentration, on the size and size distribution, and on the polymerization yield of the produced PNORBLOC microspheres has been elucidated. Polyethylene/PNORBLOC resins and films of 150±25μm thickness were prepared by melt blending of low density polyethylene with 2% (w/w) PNORBLOC microspheres of 0.25±0.03μm diameters, followed by a tubular blown process at 170–190°C. The UV irradiation (200–390nm) cut-off efficiency of these films has been demonstrated.