Abstract：The composites of poly (lactic acid) (PLA) toughened by styrene-butadiene block copolymer (SBS) were prepared via molten blending and compression molding. The effects of SBS contents were investigated on the morphologies, mechanical and thermal properties of composites. The results show that typical droplet-matrix morphologies of SBS/PLA composites were observed with well dispersed SBS particles in matrix and fine interfacial adhesion between SBS and PLA. The tensile strength and elastic modulus were decreased, however, the elongation at break and impact toughness of SBS/PLA composites were constantly increased with increasing SBS mass fraction within the range of research. The heat stability of SBS/PLA composites was greatly improved by the introduction of SBS with the evidence of thermo-decomposing temperature shifting to high temperature zone obviously.
NAMPOOTHIRI K M, NAIR N R, JOHN R P. An overview of the recent developments in polylactide (PLA) research[J]. Bioresource Technology, 2010, 101(22): 8493-8501.
ANDERSON K S, SCHRECK K M, HILLMYER M A. Toughening polylactide[J]. Polymer Review, 2008, 48(1): 85-108.
强涛, 于德梅. 聚乳酸增韧研究进展[J]. 高分子材料科学与工程, 2010, 26(9): 167-170.QIANG T, YU D M. Progress in toughening of PLA[J]. Polymer Materials Science and Engineering, 2010, 26(9): 167-170.
车晶, 秦凡, 杨荣杰. 聚乳酸/蒙脱土纳米复合材料的原位聚合及表征[J]. 材料工程, 2011, (1): 28-33.CHE J, QIN F, YANG R J. Polylactide/montmorillonite nanocomposites in-situ polymerization and characterization[J]. Journal of Materials Engineering, 2011, (1): 28-33.
HASHIMA K, NISHITSUJI S, INOUE T. Structure-properties of super-tough PLA alloy with excellent heat resistance[J]. Polymer, 2010, 51(17): 3934-3939.
OYAMA H T. Super-tough poly(lactic acid) materials: reactive blending with ethylene copolymer[J]. Polymer, 2009, 50(3): 747-751.
LI Y J, SHIMIZU H. Improvement in toughness of poly (L-lactide) (PLLA) through reactive blending with acrylonitrile-butadiene-styrene copolymer (ABS): morphology and properties[J]. European Polymer Journal, 2009, 45(3): 738-746.
ANDERSON K S, HILLMYER M A. The influence of block copolymer microstructure on the toughness of compatibilized polylactide/polyethylene blends[J]. Polymer, 45(26): 8809-8823.
冯玉林, 殷敬华, 姜摇伟, 等. 环氧基团功能化弹性体增韧聚乳酸的性能[J]. 高等学校化学学报, 2012, 33(2): 400-403.FENG Y L, YIN J H, JIANG Y W, et al. Properties of poly(lactic acid) toughened by epoxy-functionalized elastomer[J]. Chemical Journal of Chinese Universities, 2012, 33(2): 400-403.
SU Z Z, LI Q Y, LIU Y J, et al. Compatibility and phase structure of binary blends of poly(lactic acid) and glycidyl methacrylate grafted poly(ethylene octane)[J]. European Polymer Journal, 2009, 45(8): 2428-2433.
SHI Q F, CHEN C, GAO L, et al. Physical and degradation properties of binary or ternary blends composed of poly (lactic acid), thermoplastic starch and GMA grafted POE[J]. Polymer Degradation and Stability, 2011, 96(1): 175-182.
张留进, 陈广义, 魏志勇, 等. 不同增容剂对POE增韧聚乳酸性能的影响[J]. 高分子材料科学与工程, 2012, 28(6): 57-60. ZHANG L J, CHEN G Y, WEI Z Y, et al. Effect of different compatibilizers on the property of PLA/POE composites[J]. Polymer Materials Science and Engineering, 2012, 28(6): 57-60.
HERNADEZ M, SANTANA O O, ICHAZO M N, et al. Fracture behavior at low strain rate of dynamically and statically vulcanized polypropylene/styrene-butadiene-styrene block copolymer blends[J]. Polymer Testing, 2008, 27(7): 881-885.
PRZYBYTNIAK G K, ZAGORSKI Z P, ZUCHOWSKA D. Free radicals in electron beam irradiated blends of polyethylene and butadiene-styrene block copolymer[J]. Radiation Physics and Chemistry, 1999, 55(5-6): 655-658.
AL-SALEH M H, SUNDARARAJ U. Nanostructured carbon black filled polypropylene/polystyrene blends containing styrene-butadiene-styrene copolymer: influence of morphology on electrical resistivity[J]. European Polymer Journal, 2008, 44(7): 1931-1939.
FU Q, WANG G H. Polyethylene toughened by rigid inorganic particles[J]. Polymer Engineering and Science, 1992, 32(2): 94-97.