Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7889475 | Composites Part A: Applied Science and Manufacturing | 2018 | 27 Pages |
Abstract
The microporous poly(l-lactic acid) (PLLA) was prepared successfully by uniaxial stretching PLLA with nanoscale dispersed silica as pore forming agent. The SEM results revealed that the silica dispersed uniformly in the PLLA matrix with the form of monodispersed nanoparticles or nanoscale aggregates when the content was 3-20â¯wt%. The number and size of the micropores and the porosity for the microporous PLLA were increased with the increase of silica content, stretching ratio and stretching rate (5-20â¯mm/min), while were reduced with the rise of stretching temperature. The stretching ratio of 2.5 was the key point for pore forming when silica content was under 10â¯wt%. The porosity was up to 21.1% with the silica content of 20â¯wt% and stretching ratio of 4.5. The mechanical properties and thermal insulation properties of microporous PLLA were also improved comparing with that of PLLA without pores.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yunjing Chen, Lijing Han, Helong Chen, Shiling Jia, Lisong Dong,