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1 Acta Materiae Compositae Sinica Vol125 No16 December 2008 : (2008) : 1,2, 3 1,2, 1,2 (1., ; 2., ),,, (17 mm) 5 %, 134 MPa,, % : : ; ; ; O636 : A Bioabsorbable chitosan rod reinf orced by chitosan f iber SH EN Bingxing 1,2, HU Xiaolan 3 1,2, DON G Yanming 1,2 (1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen , China ; 2. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen , China) Abstract : The chitosan rods were prepared by in2situ precipitation, and then chitosan fibers were filled into the matrix to reinforce the chitosan composite rod. The mechanical properties of this composite rod were investigated, and the morphology of the f racture surfaces was observed by means of SEM. The result s indicate that chitosan fiber can improve the mechanical properties of the chitosan composite rod obviously. It is shown that the flexural strength of the composite is improved firstly and then decreases with increasing the mass f raction of chitosan fiber. Compared with the chitosan rod without chitosam fiber, the flexural strength of the composite increases with increasing the length of chitosan fiber. The flexural strength of the composite increases by % when 5 % mass f raction of chitosan fiber with the length 17 mm was filled. This kind of chitosan fiber/ chitosan composite will be widely used in the field of internal fixation in surgery. Keywords : chitosan rod ; chitosan fiber ; reinforcement ; bone nail materials,,,,,,,,,,,, ( [122 ] ) ( [ 326 ] ),,, 1996, [7 ], : ; : : ( ) ; ( E ) ; ( XD KJ CX ) :,,, E2mail : edu. cn

2 , : 29, [829 ], ( PLL A), BIOFIX g [ 10 ],,,,,,,,,,,,,, , 50 MPa s ( 1 wt %, 1 wt %, 25 ), %,, 1. 2 [9 ], 2 wt % 5 %,,,,,,, 12 h, GB/ T ,, [11 ], 40 mm, 4 mm/ min 25, 60 4 h WDS25 XL302ESEM, ( ) , ( L = 5 mm 8 mm),, 1 5 mm,,, 8 %, 8 mm, 1,,,,,,,,,,,, 2 %8 %,,,,,,, 1, 8 %,, 1 Fiber Table 1 Influence of chitosan f iber mass fraction lengt h/ mm on the flexural elastic modulus of the composites Flexural elastic modulus/ GPa 0 % 2 % 5 % 8 % 11 % 14 %

3 30 1 Fig. 1 Influence of chitosan fiber mass fraction on the flexural strength of the composites 2. 2 (5 % 8 %), 2,,,,,, 14 mm 17 mm,,, 2,,,,, Mass 2 Table 2 The influence of chitosan f iber length on fraction/ % the flexural elastic modulus of the composites Flexural elastic moludus/ GPa 0 mm 5 mm 8 mm 11 mm 14 mm 17 mm Fig. 2 Influence of chitosan fiber length on the flexural strength of the composites 2. 3,,,,,,,,,,, 3 (a),,, ;, 3 ( b),,, 3 (c),,,, ;,, 3 (d),,,,,

4 申丙星, 等 : 可吸收壳聚糖纤维增强壳聚糖棒材图3 Fig 壳聚糖纤维/ 壳聚糖复合材料弯曲断面电镜照片 SEM p hotograp hs of flexural f ract ure of chito san fiber/ chito san co mposites 将壳聚糖纤维加入到壳聚糖乙酸溶液中时, 壳聚糖纤维发生了一定程度的溶胀, 使得在采用原位沉析法制备壳聚糖纤维增强壳聚糖棒材的过程中, 壳聚糖纤维与壳聚糖基体之间发生了强烈的扩散与渗透作用, 使复合材料的界面粘结性大大改善从图 3 ( d) 观察到的丝带状结构和部分紧密连接的界面正是由于这种纤维与基体之间的扩散与渗透作用造成的的力学性能参考文献 : [1] Singh D K, Ray A R. Biomedical application of chitin, chito san and t heir derivatives [J ]. J MS2 Rev Macro mol Chem Phys, 2000, 40 (1) : [2] 卢凤琦, 曹宗顺. 生物降解性防术后粘连膜的实验研究 [J ]. 生物医学工程学杂志, 1996, 13 (4) : Lu Fengqi, Cao Zongshun. St udies on biodegradable membrane for t he p revention of po st surgical adhesions [ J ]. 3 结论 ( 1) 壳聚糖纤维对壳聚糖棒材的力学性能改善 Journal of Biomedical Engineering, 1996, 13 (4) : [3] 与生物相容性研究 [ J ]. 生物医学工程学杂志, 1998, 15 明显在实验范围内, 壳聚糖棒材的弯曲强度随壳聚糖纤维添加量的增加先增加而后发生下降, 而随着壳聚糖纤维长度的增加而增加当壳聚糖纤维 ( 17 mm) 质量分数为 5 %时, 壳聚糖棒材弯曲强度达到 134 M Pa, 与未增强壳聚糖棒材 ( M Pa ) 相比提高了 % 复合材料的弯曲弹性模量随壳聚糖纤维含量的增大而逐渐增大, 在相同纤维含量下, 模量受纤维长度的影响较小 ( 2) 由于壳聚糖纤维和壳聚糖基体的主成分相同, 在复合材料形成过程中纤维与基体发生强烈扩散和渗透, 形成良好的粘结界面, 使材料具有较高卢凤琦, 曹宗顺, 庄昭霞, 牟忠祥, 封锡志. 壳聚糖膜的降解 (2) : Lu Fengqi, Cao Zongshun, Zhuang Zhaoxia, Mou Zhongxiang, Feng Xizhi. Biodegradation and bioco mpatibilit y of a chito san film [ J ]. Journal of Bio medical Engineering, 1998, 15 (2) : [4] 卢凤琦, 曹宗顺. 壳聚糖明胶混合膜的制备及其生物降解性研究 [J ]. 生物医学工程学杂志, 1998, 15 (4) : L u Fengqi, Cao Zhongshun. Preparation of chitosan 2 gelatin mixed film and st udy on itπs biodegradabilit y [J ]. Journal of Biomedical Engineering, 1998, 15 (4) : [5] 郑化, 杜予民, 余家会, 肖玲. 交联壳聚糖膜的制备及其性能的研究 [J ]. 高等学校化学学报, 2000, 21 (5) : 8092

5 Zheng Hua, Du Yumin, Yu Jiahui, Xiao Ling. The properties and preparation of crosslinked chitosan films [J ]. Chemical Research in Chinese Universities, 2000, 21 ( 5) : [ 6 ] Hu Q L, Fang Z P, Zhao Y, Xu C W. A new met hod to prepare chitosan membrane as a biomedical material [J ]. Ch J Polym Sci, 2001, 19 (5) : [ 7 ],,,. [J ]., 1996, 13 (4) : Zhang Jianxiang, Tang Jian, Xu Bin, et al. Biocompatibility and safety evaluation of chitosan rod [ J ]. Journal of Biomedical Engineering, 1996, 13 (4) : [ 8 ],,,,. / [ J ]., 2002 (6) : Li Baoqiang, Hu Qiaoling, Qian Xiuzhen, Fang Zhengping, Shen Jiacong. Bioabsorbable chitosan/ hydroxyapatite composite rod prepared by in 2 situ precipitation for internal fixation of bone fracture [J ]. Acta Polymerica Sinica, 2002 (6) : [ 9 ],,,. [J ]., 2003, 24 (3) : Hu Qiaoling, Qian Xiuzhen, Li Baoqiang, Shen Jiacong. Studies on chitosan rods prepared by in situ precipitation method [ J ]. Chemical Research in Chinese Universities, 2003, 24 (3) : [ 10 ],,,. [J ]., 2006, 23 (3) : Duan Liang, Xu Zhifei, Sun Kang, et al. Preparation and biological evaluation of chitin short fiber reinforced polycaprolactone composite [ J ]. Journal of Biomedical Engineering, 2006, 23 (3) : [ 11 ] Saikku2Backstrom A, Pohjone T, Tormala P, Raiha J E, Rokkanen P. Material properties of absorbable self 2 reinforced fibrillated poly296l/ 42D2lactide ( SR2PLA96) rods [J ]. Journal of Material Science : Material Medicine, 1999, 10 (1) : 128.

12-1b T Q235B ML15 Ca OH Table 1 Chemical composition of specimens % C Si Mn S P Cr Ni Fe

12-1b T Q235B ML15 Ca OH Table 1 Chemical composition of specimens % C Si Mn S P Cr Ni Fe * - - 100084 Q235B ML15 Ca OH 2 DOI 10. 13204 /j. gyjz201508023 STUDY OF GALVANIC CORROSION SENSITIVITY BETWEEN ANY COUPLE OF STUD WELDMENT OR BEAM Lu Xinying Li Yang Li Yuanjin Department of Civil Engineering