Liu Fang, Jia Demin, Wu Xiaohua, Hou Tianwei, Wu Changrong, You Changjiang, Wang Yingjun
Materials College, South China University of Technology, Guangzhou 510640.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2002 Dec;19(4):624-7.
In this paper, poly(D,L-lactide) (PDLLA), MDI chain-extending poly(D,L-lactide) (PDLLA/MDI) and MDI chain-extending poly(D,L-lactide)/hydroxyapatite composite (PDLLA/HA/MDI) were prepared respectively and the effects of moulding and extruding conditions on their mechanical properties were also investigated. At the optimal conditions, bending strength of PDLLA and PDLLA/MDI is 35.1 MPa and 51.3 MPa, respectively, and their bending modulus is 2413.6 MPa and 1830.9 MPa, respectively. Bending strength of PDLLA/HA and PDLLA/HA/MDI is 31.2 MPa and 55.4 MPa, respectively, and their bending modulus is 1735.0 MPa and 2068.5 MPa, respectively. These results have shown that the mechanical properties of PDLLA/MDI and PDLLA/HA/MDI have enhanced significantly by MDI chain-extending.
本文分别制备了聚（D，L-丙交酯）（PDLLA）、二苯基甲烷二异氰酸酯扩链聚（D，L-丙交酯）（PDLLA/MDI）和二苯基甲烷二异氰酸酯扩链聚（D，L-丙交酯）/羟基磷灰石复合材料（PDLLA/HA/MDI），并研究了成型和挤出条件对其力学性能的影响。在最佳条件下，PDLLA和PDLLA/MDI的弯曲强度分别为35.1MPa和51.3MPa，弯曲模量分别为2413.6MPa和1830.9MPa。PDLLA/HA和PDLLA/HA/MDI的弯曲强度分别为31.2MPa和55.4MPa，弯曲模量分别为1735.0MPa和2068.5MPa。这些结果表明，通过二苯基甲烷二异氰酸酯扩链，PDLLA/MDI和PDLLA/HA/MDI的力学性能显著提高。
