Preparation and Characterization of Polymer-Inorganic Nanocomposites by In Situ Melt Polycondensation of L-Lactic Acid and Surface-Hydroxylated MgO

被引：73

作者：

Li, Yonghui ^{[1
]}

Sun, Xiuzhi Susan ^{[1
]}

机构：

[1] Kansas State Univ, Dept Grain Sci & Ind, Biomat & Technol Lab, Manhattan, KS 66506 USA

来源：

BIOMACROMOLECULES | 2010年 / 11卷 / 07期

关键词：

METAL-OXIDE PARTICLES; POLY(LACTIC ACID); SILICATE NANOCOMPOSITES; BIODEGRADABLE POLYMERS; MECHANICAL-PROPERTIES; TIO2; NANOPARTICLES; CHEMICAL REAGENTS; POLY(L-LACTIDE); HYDROXYAPATITE; POLYLACTIDE;

D O I：

10.1021/bm100320q

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Compared with pristine polymers, bionanocomposites derived from biopolymers and inorganic nanoparticles have significantly improved electrical/magnetic properties, mechanical properties, thermal stability, gas barrier properties, and fire retardance. In this study, poly(lactic acid) (PLA) nanocomposites were prepared by in situ melt polycondensation of L-lactic acid with different loading ratios of surface-hydroxylated magnesium oxide (MgO) nanocrystals. Molecular weight, structure, morphology, and thermal properties of the nanocomposites were characterized. PLA-grafted MgO (PLA-g-MgO) was isolated from free PLA for the nanocomposite with 3% MgO via repeated dispersion/centrifugation processes and characterized. The weight-average molecular weight of the PLA-0.01%MgO nanocomposite was 55500, which was 30% higher than that of pure PLA. Discoloration of PLA was obviously depressed in the presence of MgO nanocrystals. Formation of hydrogen bonding between PLA chains and surface -OH groups from MgO was detected by Fourier transform infrared spectroscopy. Morphological images showed uniform dispersion of MgO nanocrystals in the PLA matrix and demonstrated a strong interfacial interaction between the PLA matrix and MgO nanocrystals. PLA-MgO nanocomposites exhibited improved thermal stability compared with pure PLA. Calculations based on thermogravimetric analysis revealed that more than 42.5% PLA was successfully grafted into PLA-g-MgO.

引用

页码：1847 / 1855

页数：9

共 61 条

[1] Oxide surfaces as environmental interfaces [J].

Al-Abadleh, HA ;

Grassian, VH .

SURFACE SCIENCE REPORTS, 2003, 52 (3-4) :63-161

[2] Polymer-layered silicate nanocomposites: Preparation, properties and uses of a new class of materials [J].

Alexandre, Michael ;

Dubois, Philippe .

Materials Science and Engineering: R: Reports, 2000, 28 (1-2) :1-63

[3] Toughening polylactide [J].

Anderson, Kelly S. ;

Schreck, Kathleen M. ;

Hillmyer, Marc A. .

POLYMER REVIEWS, 2008, 48 (01) :85-108

[4] INTERMOLECULAR HYDROGEN-BONDING EFFECT ON C-13 NMR CHEMICAL-SHIFTS OF GLYCINE RESIDUE CARBONYL CARBONS OF PEPTIDES IN THE SOLID-STATE [J].

ANDO, S ;

ANDO, I ;

SHOJI, A ;

OZAKI, T .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1988, 110 (11) :3380-3386

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

Auras, R ;

Harte, B ;

Selke, S .

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

[6] Lactic acid-magnesium oxide nanocrystal interactions: how nanoparticle size and shape affect chemistry and template oligomerization [J].

Beavers, Erin M. ;

Klabunde, Kenneth J. ;

Wang, Biobing ;

Sun, Susan .

NEW JOURNAL OF CHEMISTRY, 2009, 33 (09) :1951-1959

[7] Role of epoxy groups on clay surface in the improvement of morphology of poly(L-lactide)/clay composites [J].

Chen, GX ;

Kim, HS ;

Shim, JH ;

Yoon, JS .

MACROMOLECULES, 2005, 38 (09) :3738-3744

[8] Role of hydroxyl groups in the basic reactivity of MgO: a theoretical and experimental study [J].

Chizallet, C. ;

Costentin, G. ;

Lauron-Pernot, H. ;

Krafft, J. M. ;

Bazin, P. ;

Saussey, J. ;

Delbecq, F. ;

Sautet, P. ;

Che, M. .

OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES, 2006, 61 (04) :479-488

[9] Study of the structure of OH groups on MgO by 1D and 2D 1H MAS NMR combined with DFT cluster calculations [J].

Chizallet, Celine ;

Costentin, Guylene ;

Lauron-Pernot, Helene ;

Che, Michel ;

Bonhomme, Christian ;

Maquet, Jocelyne ;

Delbecq, Francoise ;

Sautet, Philippe .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (49) :18279-18287

[10] Infrared characterization of hydroxyl groups on MgO: A periodic and cluster density functional theory study [J].

Chizallet, Celine ;

Costentin, Guylene ;

Che, Michel ;

Delbecq, Francoise ;

Sautet, Philippe .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (20) :6442-6452

← 1 2 3 4 5 6 7 →