In situ photo-cross-linking of cinnamate functionalized poly(methyl methacrylate-co-2-hydroxyethyl acrylate) fibers during electrospinning
In situ photo-cross-linking of cinnamate functionalized poly(methyl methacrylate-co-2-hydroxyethyl acrylate) fibers during electrospinning
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DOI：
10.1021/ma048844g
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发表时间：
2004-11-30
期刊：
影响因子：
5.5
通讯作者：
Wilkes, GL
中科院分区：
文献类型：
--
作者：
Gupta, P;Trenor, SR;Wilkes, GL
介绍了一种在静电纺丝过程中原位交联聚合物纤维的新方法。电纺装置进行了修改，以促进紫外线照射的电纺纤维，同时在飞行中的收集器目标。合成了三种具有不同摩尔%的光反应性肉桂酸酯官能团（4、9和13摩尔%）的聚合物，并将其用于本研究。在静电纺丝过程中，肉桂酸酯官能化的聚（甲基丙烯酸甲酯-co-2-羟乙基丙烯酸酯）纤维通过紫外光照射原位交联。随后的红外光谱测量辐照和未辐照的静电纺丝纤维表明两个[2 pi +2 pi]环加成的亚乙烯基C=C和反式-顺式光异构化的肉桂酸基团。此外，照射的共聚物被观察到形成不溶性凝胶，这表明在紫外光照射过程中的光二聚化是主要的光过程，导致交联网络的形成。正如预期的那样，发现凝胶分数随着肉桂酸酯物质的摩尔%的增加而增加。
A novel methodology for in situ cross-linking of polymeric fibers during electrospinning is described. The electrospinning apparatus was modified to facilitate UV irradiation of the electrospun fibers while in flight to the collector target. Three polymers with different mol % of the photoreactive cinnamate functional group (4, 9, and 13 mol %) were synthesized and utilized for this study. Fibers of cinnamate functionalized poly(methyl methacrylate-co-2-hydroxyethyl acrylate) were cross-linked in situ by UV irradiation during electrospinning. Subsequent FTIR measurements on irradiated and non-irradiated electrospun fibers indicated both [2pi + 2pi] cycloaddition of the vinylene C=C and trans-cis photoisomerization of the cinnamate group. Furthermore, the irradiated copolymers were observed to form insoluble gels which indicated that the photodimerization was the primary photoprocess during UV irradiation, leading to the formation of a cross-linked network. As expected, it was found that the gel fraction increased with increasing mol % of the cinnamate species.