Affecting mechanism of chitosan on water resistance of magnesium phosphate cement

作者：Liao, Jianguo^*; Lu, Shanxing; Duan, Xingze; Xie, Yufen; Zhang, Yongxiang; Li, Yanqun; Zhou, Aiguo

来源：International Journal of Applied Ceramic Technology, 2018, 15(2): 514-521.

DOI：10.1111/ijac.12795

• cement
• degradation
• magnesium oxide
• phosphate

To solve the problem of poor water resistance and restricted usage of magnesium phosphate cement, the cement prepared by NaH2PO4 and NH4H2PO4 was modified via chitosan, and the modification mechanism was also explored. The results showed that the optimum molar ratio of NaH2PO4: NH4H2PO4 was 2:3. Upon setting the chitosan content of wt.1%, the mechanical strength of the resulting cements after 28 days was 42 MPa. After water immersion, the percentage of the lost mechanical strength of cements and mass loss was smaller than those in the control group. Free amino group on the molecular chain of chitosan could react with Mg2+ ions to form complexes. Interconnected polymer network structure was formed in magnesium phosphate bone cement paste. Magnesium phosphate bone cement had hydration products with Mg2+ ions as nucleation sites, which further gradually formed a network structure, indicating that chitosan could improve the water resistance of magnesium phosphate bone cements.

• 出版日期2018-4
• 单位河南理工大学