Podgórski Maciej, Chatani Shunsuke, Bowman Christopher N
Department of Chemical and Biological Engineering, University of Colorado, UCB 596, Boulder, CO, 80309, USA; Faculty of Chemistry, Department of Polymer Chemistry, MCS University, pl. Marii Curie-Skłodowskiej 5, 20-031, Lublin, Poland.
Macromol Rapid Commun. 2014 Sep;35(17):1497-502. doi: 10.1002/marc.201400260. Epub 2014 Jun 25.
Thermomechanical properties of neat phosphine-catalyzed thiol-Michael networks fabricated in a controlled manner are reported, and a comparison between thiol-acrylate and thiol-vinyl sulfone step-growth networks is performed. When highly reactive vinyl sulfone monomers are used as Michael acceptors, glassy polymer networks are obtained with glass transition temperatures ranging from 30 to 80 °C. Also, the effect of side-chain functionality on the mechanical properties of thiol-vinyl sulfone networks is investigated. It is found that the inclusion of thiourethane functionalities, aryl structures, and most importantly the elimination of interchain ester linkages in the networks significantly elevate the network's glass transition temperature as compared with neat ester-based thiol-Michael networks.
报道了以可控方式制备的纯膦催化硫醇-迈克尔网络的热机械性能，并对硫醇-丙烯酸酯和硫醇-乙烯基砜逐步增长网络进行了比较。当使用高反应性的乙烯基砜单体作为迈克尔受体时，可获得玻璃化转变温度范围为30至80°C的玻璃态聚合物网络。此外，还研究了侧链官能团对硫醇-乙烯基砜网络机械性能的影响。结果发现，与纯酯基硫醇-迈克尔网络相比，网络中包含硫脲官能团、芳基结构，最重要的是消除链间酯键，可显著提高网络的玻璃化转变温度。
