| PREPARATION AND PROPERTIES OF HIGH STRENGTH RODS FROM L-AND D,L-LACTIDE COPOLYMER |
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| 作者姓名： | Yu-shan Hu Zheng-pu Zhang Dong Song Dong-ren Bai Yong-mei Wang Institute of Polymer Chemistry State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation Nankai University Tianjin China |
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| 作者单位： | Yu-shan Hu;Zheng-pu Zhang;Dong Song;Dong-ren Bai;Yong-mei Wang Institute of Polymer Chemistry State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation，Nankai University Tianjin 300071，China |
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| 摘 要： | Starting with the L-and D,L-lactide copolymer (L:DL = 9: 1) P(L-DL)LA] of M_w = 32.1×10~4, rods were obtainedthrough a two stage process: (1) melt-extrusion at 155℃, and (2) hot-drawing at 90℃ to various drawing ratios. Themolecular weight of P(L-DL)LA fell to 9.3×10~4 as a consequence of the production process. The crystallization andmolecular orientation of P(L-DL)LA developed as a result of the hot-drawing. The mechanical strengths of the rods increasewith the drawing ratio. The maximum for tensile strength, bending strength, bending modulus, and shear strength are329 MPa, 237 MPa, 8.8 GPa, and 157 MPa, respectively.
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| 关 键 词： | P（L-DL）LA Self-reinforcement Rod Process Bone fracture fixation |
| 收稿时间： | 2000-07-09 |
| 修稿时间： | 2000-08-25 |
PREPARATION AND PROPERTIES OF HIGH STRENGTH RODS FROM L-AND D,L-LACTIDE COPOLYMER |
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| Yu-shan Hu,Zheng-pu Zhang,Dong Song,Dong-ren Bai,Yong-mei Wang Institute of Polymer Chemistry State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation,Nankai University Tianjin ,China.PREPARATION AND PROPERTIES OF HIGH STRENGTH RODS FROM L-AND D,L-LACTIDE COPOLYMER[J].Chinese Journal of Polymer Science,2001,0(4):351-357. |
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| Authors: | Yu-shan Hu Zheng-pu Zhang Dong Song Dong-ren Bai Yong-mei Wang |
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| Institution: | Institute of Polymer Chemistry State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation; Nankai University Tianjin 300071; China |
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| Abstract: | Starting with the L- and D,L-lactide copolymer (L:DL = 9: 1) P(L-DL)LA] of Mw = 32.1×104, rods were obtainedthrough a two stage process: (1) melt-extrusion at 155℃, and (2) hot-drawing at 90℃ to various drawing ratios. Themolecular weight of P(L-DL)LA fell to 9.3×104 as a consequence of the production process. The crystallization andmolecular orientation of P(L-DL)LA developed as a result of the hot-drawing. The mechanical strengths of the rods increasewith the drawing ratio. The maximum for tensile strength,bending strength,bending modulus,and shear strngth are 329 MPa,237 MPa,8.8 GPa,and 157 MPa,respectively. |
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| Keywords: | P(L-DL)LA Self-reinforcement Rod Process Bone fracture fixation |
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