Toughness decrease of PLA-PHBHHx blend films upon surface-confined photopolymerization

被引：91
作者：
Rasal, Rahul M. [1 ,2 ]
Hirt, Douglas E. [1 ,2 ]
机构：
[1] Clemson Univ, Dept Chem & Biomol Engn, Clemson, SC 29634 USA
[2] Clemson Univ, Ctr Adv Engn Fibers & Films, Clemson, SC 29634 USA
来源：
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A | 2009年 / 88A卷 / 04期
基金：
美国国家科学基金会;
关键词：
PLA; PHBHHx; physical aging; surface modification; toughness; POLY(LACTIC ACID); IN-VITRO; BIODEGRADABLE POLYLACTIDE; MECHANICAL-PROPERTIES; PHOTOGRAFTING PROCESS; POLYHYDROXYALKANOATES; COPOLYMERS; MORPHOLOGY; MISCIBILITY; POLY(L-LACTIDE);
D O I：
10.1002/jbm.a.32009
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
The present research investigates the effect of photoinduced grafting reaction on the bulk properties of melt processed poly(L-lactic acid) (PLA)-poly[(3-hydroxybutyrate)-co-(3-hydroxyhexanoate)] (PHBHHx) blend films. PLA-PHBHHx blend films, comprising 10 wt % PHBHHx showed a remarkable toughness improvement. From dynamic mechanical analysis of melt processed PLA-PHBHHx blend films, the blend appears to be noncompatible. Unfortunately, PLA-PHBHHx blend films underwent rapid physical aging as characterized using differential scanning calorimetry, resulting in a significant toughness loss. Physically aged films regained the original toughness on annealing at 60 C for 30 min. Annealed PLA-PHBHHx blend films also underwent physical aging leading to a significant toughness loss. Hydrophilic monomers like acrylic acid and acrylamide were successfully photopolymerized from the film surface using a sequential, two-step photo-grafting approach. The resultant films were characterized using water contact angle goniometry, ATR-FTIR spectroscopy, and mechanical testing. PLA-PHBHHx blend films lost their toughness significantly on surface modification and this was assigned to UV-assisted solvent induced crystallization as characterized using wide-angle X-ray diffraction analyses. (c) 2008 Wiley Periodicals, Inc. J Biomed Mater Res 88A: 1079-1086, 2009
引用
收藏
页码：1079 / 1086
页数：8
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