利用金属氨酸进行选择性活激素聚合,可在可见波长上调节
Sivaprakash Shanmugam1, Jiangtao Xu1,2, Cyrille Boyer1,2
1†Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia.
Journal of the American Chemical Society
|July 14, 2015
概括
像ZnTPP这样的甲可以在可见光下进行选择性光诱导电子转移-可逆添加-碎片化链转移 (PET-RAFT) 聚合三碳酸盐. 这种方法提供氧气耐受性和可调节率,用于先进的聚合物合成.
科学领域:
- 聚合物化学 聚合物化学
- 光催化作用的光催化
- 材料科学 材料科学 材料科学
背景情况:
- 金属氨酸越来越多地用于医学 (光动力学疗法) 和材料科学 (太阳能).
- 在可见光下的光诱导生物聚合物中对金属烯的研究是一个新的研究领域.
- 光诱导电子转移-可逆添加-碎片化链转移 (PET-RAFT) 是一种受控的聚合技术.
研究的目的:
- 探索金属胺的潜力,特别是胺,在光诱导生物聚合过程中.
- 在可见光下研究由色素在可见光下选择性激活硫乙化合物.
- 了解这种新型聚合系统的机制和特性.
主要方法:
- 作为光催化剂使用四甲 (ZnTPP).
- 使用三碳酸盐化合物研究了 styrene, (meth) acrylates 和 (meth) acrylamides 的聚合.
- 在广泛的波长范围内 (435655 nm) 用可见光照射反应混合物.
- 检查了ZnTPP对不同硫基化合物的选择性.
主要成果:
- 在可见光下,ZnTPP选择性激活PET-RAFT聚合三碳酸盐用于各种单体.
- 其他二氧化碳基化合物 (dithiobenzoate,dithiocarbamate,xanthate) 没有得到有效的激活.
- 聚合物表现出氧气耐受性,允许在空气中发生激进的聚合物.
- 聚合率 (kp(app) 从1.22.6 × 10−2 min−1) 可以通过不同的可见光波长来调整.
- 提出了ZnTPP和三碳酸盐之间的特定分子级相互作用.
结论:
- 色素是可见光下的三碳酸盐选择性PET-RAFT聚合物的有效光催化剂.
- 这种方法为可调节速率和氧气耐受性控制聚合提供了一条新的途径.
- 观察到的选择性表明ZnTPP和三碳酸盐之间的独特分子识别,在聚合物合成中开辟了新的途径.
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