Microcellular Foaming of Poly(lactic acid)/Silica Nanocomposites in Compressed CO2: Critical Influence of Crystallite Size on Cell Morphology and Foam Expansion

被引：92

作者：

Ji, Guoying ^{[1
]}

Zhai, Wentao ^{[1
]}

Lin, Dongpo ^{[1
]}

Ren, Qian ^{[2
]}

Zheng, Wenge ^{[1
]}

Jung, Dong Won ^{[3
]}

机构：

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo Key Lab Polymer Mat, Ningbo 315201, Zhejiang, Peoples R China

[2] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China

[3] Jeju Natl Univ, Dept Mech Engn, Jeju Do 690756, South Korea

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2013年 / 52卷 / 19期

基金：

中国国家自然科学基金;

关键词：

SEMICRYSTALLINE STATES; LOW-DENSITY; ACID); BEHAVIOR; POLY(ETHYLENE-TEREPHTHALATE); POLY(L-LACTIDE); NANOPARTICLES; POLYPROPYLENE; NUCLEATION;

D O I：

10.1021/ie302281c

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

During the solid state foaming, the CO2 saturated poly(lactic acid) (PLA) sample at 5 MPa and 20 degrees C has a high crystallinity of 23.2%, and the prepared PLA foams exhibits low foam expansion and nonuniform cell structure. This study presents an interesting effect of nanosilica addition on the cell morphology and expansion ratio of PLA foams. It was found that the presence of nanosilica increased the induced crystallinity of PLA up to 29.7% at 5 MPa. The resultant PLA/silica foams exhibited significant and concurrent increase in cell structure uniformity and cell density: the cell density increased about 5-10 times, the expansion ratio increased 1.4-2.1 times, and the crystallinity of foams increased 1.3 times, compared to pure PLA foams. Further investigation suggested that the formation of the tiny crystallite size and the well dispersed nanosilica aggregates were thought as the main reasons to explain the interesting effect of nanosilica addition on the foaming behavior of PLA.

引用

页码：6390 / 6398

页数：9

共 35 条

[1] Preparation and characterization of microcellular polystyrene foams processed in supercritical carbon dioxide [J].