writer：Jingxin Zhao, Qiucheng Yang, Tao Wang, Lian Wang, Jichun You
keywords：porous membranes; shape memory effect; separation; deformation; pore size;
source：期刊
specific source：ACS Appl. Mater. & Interfaces 2017, 9, 43415?43419;
Issue time：2017年

An effective strategy to tailor the microporous structures has been developed based on the shape memory effect in porous poly(L-lactic acid) membranes in which tiny crystals and amorphous matrix play the roles of shape-fixed phase and reversible-phase, respectively. Our results indicate that not only PLLA membranes but micropores exhibit shape memory properties. The proportional deformations on two scales have been achieved by uniaxial or biaxial tension, providing a facile way to manipulate continuously the size and the orientation degree of pores on microscale. The enhanced separation performance has been validated by taking polystyrene colloids with varying diameters as an example.