摘要
以偶氮染料的乙烯基单体与可溶性淀粉的接枝共聚物为原料,利用动力学分析方法研究其共聚物及其对应的单体在溶液中的光致变色行为.结果表明,由于淀粉骨架的影响,共聚物较单体具有较好的光致变色性;另外,由于空间位阻的影响,对于邻位被丙烯酰氧基取代的聚合物来说,在一定波长的光照射下,发生了光致变色性的禁阻,而对于对位被取代的聚合物,在一定波长的光照射下,由于空间位阻较小,为光致变色性允许,可见,空间位阻是影响光致变色性能的一个非常重要的因素.
The photoisomerization of eopolymers of vinyl monomer and soluble starch and their corresponding monomers were investigated in liquids by dynamical analysis. The experimental results showed that the backbone of starch in the main chain had a marked influence on photoisomerization. The graft copolymers showed better photoisomerization than their corresponding monomers. In addition,the effect of spatial hin- drance was investigated. The results showed that the copolymers of para-acrolyloxy substitution exhibited good photoisomerization while ortho-acroloyloxy substitution appeared to take place photochromic hindrance. It suggested that spatial hindrance was an important factor to influence remarkably photoisomerization.
出处
《兰州交通大学学报》
CAS
2009年第3期170-173,共4页
Journal of Lanzhou Jiaotong University
关键词
接枝共聚物
吸收波长
空间位阻
光致变色
graft copolymer
absorption spectra
spatial hindrance
photochromism
