Mechanical and thermal properties of polypeptide modified hydroxyapatite/poly(L-lactide) nanocomposites  

作　　者：WEI JunChao DAI YanFeng CHEN YiWang CHEN XueSi 

机构地区：[1]Department of Chemistry, Nanchang University, Nanchang 330031, China [2]CAS Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

出　　处：《Science China Chemistry》2011年第3期431-437,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (50733003);the International Cooperation Fund of Science and Technology (20071314) from the Ministry of Science and Technology of China;the fund from Chinese Academy of Sciences (KGCX-YW-208)

摘　　要：A new type of polypeptide(poly(-benzyl-L-glutamate)(PBLG))modified hydroxyapatite(HA)/poly(L-lactide)(PLLA)nanocomposites(PBLG-g-HA/PLLA)were prepared by the solvent-mixing method,and their mechanical and thermal properties were investigated.The tensile test showed that the mechanical properties of PBLG-g-HA/PLLA nanocomposites were better than that of PLLA,even a 0.3 wt%content of PBLG-g-HA in the nanocomposites could make the tensile strength 12%higher than that of the neat PLLA sample,and the tensile modulus was about 17%higher than that of the PLLA sample.The thermal gravimetric analysis(TGA)showed that the PBLG-g-HA/PLLA composites have better thermal stability than the PLLA sample.The differential scanning calorimetry(DSC)was used to characterize the effect of PBLG-g-HA on the crystallization of PLLA.The isothermal crystallization behavior showed that the half crystallization time(t1/2)of PBLG-g-HA/PLLA was much shorter than that of the PLLA sample.When the PBLG-g-HA content was 10%,t1/2 was only 18.7 min,while t1/2 of the PLLA sample was 61.4 min.The results showed that the PBLG-g-HA worked as a nucleating agent and enhanced the crystallization speed of PLLA.A new type of polypeptide（poly（benzyl-L-glutamate）（PBLG））modified hydroxyapatite（HA）/poly（L-lactide）（PLLA）nanocomposites（PBLG-g-HA/PLLA）were prepared by the solvent-mixing method,and their mechanical and thermal properties were investigated.The tensile test showed that the mechanical properties of PBLG-g-HA/PLLA nanocomposites were better than that of PLLA,even a 0.3 wt%content of PBLG-g-HA in the nanocomposites could make the tensile strength 12%higher than that of the neat PLLA sample,and the tensile modulus was about 17%higher than that of the PLLA sample.The thermal gravimetric analysis（TGA）showed that the PBLG-g-HA/PLLA composites have better thermal stability than the PLLA sample.The differential scanning calorimetry（DSC）was used to characterize the effect of PBLG-g-HA on the crystallization of PLLA.The isothermal crystallization behavior showed that the half crystallization time（t1/2）of PBLG-g-HA/PLLA was much shorter than that of the PLLA sample.When the PBLG-g-HA content was 10%,t1/2 was only 18.7 min,while t1/2 of the PLLA sample was 61.4 min.The results showed that the PBLG-g-HA worked as a nucleating agent and enhanced the crystallization speed of PLLA.

关 键 词：HYDROXYAPATITE poly（L-lactide） NANOCOMPOSITE surface modification 

分 类 号：TQ174.759[化学工程—陶瓷工业] TB332[化学工程—硅酸盐工业]