Study of the thermal stabilization mechanism of biodegradable poly(L-lactide)/silica nanocomposites

被引：62

作者：

Wen, Xin ^{[1
]}

Zhang, Kunyu ^{[1
]}

Wang, Yan ^{[2
]}

Han, Lijing ^{[1
]}

Han, Changyu ^{[1
]}

Zhang, Huiliang ^{[1
]}

Chen, Shan ^{[2
]}

Dong, Lisong ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

[2] NE Normal Univ, Coll Life, Changchun 130024, Peoples R China

来源：

POLYMER INTERNATIONAL | 2011年 / 60卷 / 02期

关键词：

poly(L-lactide); silica; nanocomposites; thermal stability; thermal degradation; L-LACTIC ACID; DEGRADATION MECHANISM; SILICA; STABILITY; COMPOSITES; POLYLACTIDE; POLYMERS; KINETICS; RHEOLOGY; BLENDS;

D O I：

10.1002/pi.2927

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Biodegradable poly(L-lactide) (PLA)/silica (SiO2) nanocomposites were prepared by melt compounding to investigate the effect of spherical nanofillers on the thermal stability of PLA. The nanocomposites displayed improved thermal stability both under nitrogen and in air. The stabilization mechanism was attributed mainly to the barrier effect of the network formed, which was demonstrated by the improved barrier properties and rheological performance. The dispersion of nanofiller and matrix-nanoparticle interactions were investigated to evaluate the dependence of the network on SiO2 loadings. Fourier transform infrared spectroscopy and thermogravimetric analysis indicated that hydroxyl groups on SiO2 surfaces and PLA chain-ends reacted during melt processing. The resulting grafted SiO2 and entangled PLA chains formed a dense network, which hindered the diffusion of oxygen and volatile decomposition products. Furthermore, the improvement in thermal stability resulted from the restraining effect on the mobility of active hydroxyl end-groups, so that some related thermal decomposition reactions were inhibited, which was confirmed from gel permeation chromatography measurements. (C) 2010 Society of Chemical Industry

引用

页码：202 / 210

页数：9

共 51 条

[1] An overview of polylactides as packaging materials [J].

Auras, R ;

Harte, B ;

Selke, S .

MACROMOLECULAR BIOSCIENCE, 2004, 4 (09) :835-864

[2] Poly(ε-caprolactone)-based nanocomposites:: Influence of compatibilization on properties of poly(ε-caprolactone)-silica nanocomposites [J].

Avella, M ;

Bondioli, F ;

Cannillo, V ;

Di Pace, E ;

Errico, ME ;

Ferrari, AM ;

Focher, B ;

Malinconico, M .

COMPOSITES SCIENCE AND TECHNOLOGY, 2006, 66 (7-8) :886-894

[3]

Bandyopadhyay S., 1999, Polymeric Materials Science and Engineering, V81, P159, DOI DOI 10.1177/0021998310381541

[4] Characterization and thermal degradation of polypropylene-montmorillonite nanocomposites [J].

Bertini, F ;

Canetti, M ;

Audisio, G ;

Costa, G ;

Falqui, L .

POLYMER DEGRADATION AND STABILITY, 2006, 91 (03) :600-605

[5] A new approach to prepare poly(ethylene terephthalate)/silica nanocomposites with increased molecular weight and fully adjustable branching or crosslinking by SSP [J].

Bikiaris, Dimitris ;

Karavelidis, Vassilis ;

Karayannidis, George .

MACROMOLECULAR RAPID COMMUNICATIONS, 2006, 27 (15) :1199-1205

[6] Polyethylene thermal oxidative stabilisation in carbon nanotubes based nanocomposites [J].

Bocchini, Sergio ;

Frache, Alberto ;

Camino, Giovanni ;

Claes, Michael .

EUROPEAN POLYMER JOURNAL, 2007, 43 (08) :3222-3235

[7]

Bogaert JC, 2000, MACROMOL SYMP, V153, P287, DOI 10.1002/1521-3900(200003)153:1<287::AID-MASY287>3.0.CO

[8]

2-E

[9] Influence of residual monomers and metals on poly (L-lactide) thermal stability [J].

Cam, D ;

Marucci, M .

POLYMER, 1997, 38 (08) :1879-1884

[10] Melt rheology of organoclay and fumed silica nanocomposites [J].

Cassagnau, Ph. .

POLYMER, 2008, 49 (09) :2183-+

← 1 2 3 4 5 6 →