Lin Tengfei, Ma Siwei, Lu Yang, Guo Baochun
Department of Polymer Materials and Engineering, South China University of Technology , Guangzhou 510640, People's Republic of China.
ACS Appl Mater Interfaces. 2014 Apr 23;6(8):5695-703. doi: 10.1021/am500236w. Epub 2014 Apr 8.
Shape memory polymers (SMPs) based on natural rubber were fabricated by crosslinking epoxidized natural rubber with zinc diacrylate (ZDA) using the oxa-Michael reaction. These SMPs possessed excellent shape fixity and recovery. The glass transition largely accounted for the fixing of the SMPs temporary shape. Increasing the ZDA content allowed the trigger temperature (20-46 °C) and recovery time (14-33 s) of the SMPs to be continuously tuned. Nanosized silica (nanosilica) was incorporated into the neat polymers to further increase the flexibility and tune the recovery stress. The nanosilica-SMPs exhibited exceptionally high strength in a rubbery state (>20 MPa). The nanosilica-SMPs exhibited high transparency, making them suitable in visible heat-shrinkable tubes.
基于天然橡胶的形状记忆聚合物（SMPs）通过环氧天然橡胶与二丙烯酸锌（ZDA）利用氧杂迈克尔反应交联制备而成。这些SMPs具有优异的形状固定性和回复性。玻璃化转变在很大程度上决定了SMPs临时形状的固定。增加ZDA含量可使SMPs的触发温度（20 - 46℃）和回复时间（14 - 33秒）得到连续调节。将纳米二氧化硅（纳米SiO₂）掺入纯聚合物中以进一步提高柔韧性并调节回复应力。纳米二氧化硅-SMPs在橡胶态下表现出极高的强度（>20 MPa）。纳米二氧化硅-SMPs具有高透明度，使其适用于可见热收缩管。
