Feng Jianxin, Stoddart Stephanie S, Weerakoon Kanchana A, Chen Wei
Chemistry Department, Mount Holyoke College, South Hadley, MA 01075, USA.
Langmuir. 2007 Jan 30;23(3):1004-6. doi: 10.1021/la0630110.
Surface-initiated ring-opening metathesis polymerization of cyclooctadiene (COD), a low ring-strain olefin, is reported for the first time. Polymerization was carried out in the vapor phase, which is advantageous compared to conventional solution methods in terms of minimizing chain transfer by reducing polymer chain mobility at the vapor/solid interface. Attachments of a norbornenyl-containing silane and a Grubbs catalyst to silicon substrates were carried out before samples were exposed to COD vapor. The thickness of grafted 1,4-polybutadiene films was controlled by reaction time and reached approximately 40 nm after 7 h. The polymer films were further chemically modified to afford a new polymer, head-to-head poly(vinyl alcohol).
首次报道了低环张力烯烃环辛二烯(COD)的表面引发开环易位聚合反应。聚合反应在气相中进行,与传统溶液法相比,这具有优势,因为在气/固界面处通过降低聚合物链迁移率可将链转移降至最低。在样品暴露于COD蒸气之前,先将含降冰片烯基的硅烷和格拉布催化剂附着到硅基底上。接枝的1,4-聚丁二烯薄膜的厚度通过反应时间控制,7小时后达到约40纳米。聚合物薄膜进一步进行化学改性,以得到一种新的聚合物——头对头聚(乙烯醇)。