The effect of bimodal distribution on the mechanical properties of hydroxyapatite particle filled poly(L-lactide) composites
The effect of bimodal distribution on the mechanical properties of hydroxyapatite particle filled poly(L-lactide) composites
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DOI：
10.1016/j.jmbbm.2008.06.001
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发表时间：
2009-01-01
影响因子：
3.9
通讯作者：
Takano, Atsushi
中科院分区：
文献类型：
--
作者：
Takayama, Tetsuo;Todo, Mitsugu;Takano, Atsushi
研究了微米级HA和纳米级HA颗粒的双峰分布对HA/PLLA复合材料的弯曲强度、模量和I型断裂能等力学性能的影响。与单峰分布相比，双峰分布有效地改善了弯曲性能。认为在双峰HA/PLLA体系中，由于纳米粒子的存在，使得PLLA分子链受到均匀分布的纳米粒子的约束，从而减少了分子链的变形。模式I断裂能也有效地提高了双峰分布与额外的能量耗散机制，即，密集的韧性变形的PLLA矩阵和脱粘的颗粒/基体界面在裂纹尖端区域。(C)2008爱思唯尔有限公司保留所有权利。
The effects of a bimodal distribution of micro-HA and nano-HA particles on the mechanical properties such as bending strength, modulus and mode I fracture energy of HA/PLLA composites were investigated. The bending properties were effectively improved by a bimodal distribution compared to a monomodal distribution. it is considered that in the bimodal HA/PLLA, the PLLA molecular chains are constrained by the existence of well distributed nano-particles, resulting in the reduction of the deformation of molecular chains. The mode I fracture energy was also effectively improved by a bimodal distribution with additional energy dissipation mechanisms, that is, dense ductile deformation of the PLLA matrix and debonding of the particle/matrix interfaces in the crack-tip region. (C) 2008 Elsevier Ltd. All rights reserved.