Visible Light-Induced Grafting from Polyolefins
Visible Light-Induced Grafting from Polyolefins
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DOI：
10.1021/ma401431h
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发表时间：
2013-08-27
期刊：
影响因子：
5.5
通讯作者：
Yagci, Yusuf
中科院分区：
文献类型：
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作者：
Ciftci, Mustafa;Batat, Pinar;Yagci, Yusuf
采用开环易位聚合（ROMP）、溴氢化反应和可见光引发自由基聚合相结合的方法制备了聚乙烯接枝聚丙烯酸叔丁酯（PE-g-PtBA）共聚物。首先，顺式-环辛烯在链转移剂的存在下经由ROMP聚合并定量地氢溴化。然后在可见光下，使用十羰基二锰（Mn-2（CO）（10）），通过从Br取代的线性聚（乙烯）（PE）主链接枝的方法生长聚-（丙烯酸叔丁酯）（PtBA）链。研究了Mn-2（CO）（10）浓度和辐照时间对接枝密度和接枝效率的影响。接枝共聚物的丙烯酸叔丁酯（tBA）酯通过酸解水解成丙烯酸官能团，得到亲水性聚烯烃。通过H-1和C-13 NMR、傅里叶变换红外、原子力显微镜和接触角测量对前体聚合物、接枝共聚物和水解聚合物进行了表征。
Polyethylene-graft-poly(tert-butylacrylate) (PE-g-PtBA) copolymers were prepared by using a combination of ring-opening metathesis polymerization (ROMP), hydrobromination, and visible light-induced free radical polymerization. First, cis-cyclooctene was polymerized via ROMP in the presence of a chain transfer agent and quantitatively hydrobrominated. Poly-(tert-butyl acrylate) (PtBA) chains were then grown via a grafting from approach from the Br-substituted linear poly(ethylene) (PE) backbone using dimanganese decacarbonyl (Mn-2(CO)(10)) under visible light. The effect of Mn-2(CO)(10) concentration and irradiation time on the grafting density and efficiency was evaluated. The tert-butyl acrylate (tBA) esters of the graft copolymers were hydrolyzed into acrylic acid functionalities by acidolysis to obtain hydrophilic polyolefins. The precursor polymer, graft copolymer, and hydrolyzed polymer were characterized by H-1 and C-13 NMR, Fourier transform infrared, atomic force microscopy, and contact angle measurements.