冷冻解冻法制备多孔聚乙烯醇材料及性能分析

Preparation of Porous Polyvinyl Alcohol Materials by Freeze-Thaw Method and Property Analysis

采用冷冻解冻法制备多孔聚乙烯醇/β-磷酸三钙/碳纳米管(PVA/β-TCP/CNT)复合材料,探究CNT添加量对其孔隙率及力学性能的影响。结果表明:添加适量的CNT可以有效降低PVA/β-TCP/CNT多孔复合材料的孔径和孔隙率,保障多孔聚乙烯醇复合材料形成更致密的多孔结构。CNT添加量为0.3%~0.5%时,复合材料的孔隙率最低,约为82%。添加CNT后,PVA/β-TCP/CNT多孔复合材料的弹性模量及拉伸强度均显著提升,PVA/β-TCP/CNT多孔复合材料的溶胀度均明显下降。CNT添加量为0.3%时,复合材料的弹性模量及拉伸强度达到2 245.08 MPa和6.61 MPa。制备的PVA/β-TCP/CNT多孔复合材料能够满足医疗生物材料聚合物支架的要求。

Porous polyvinyl alcohol/β-Tricalcium phosphate/carbon nanotubes(PVA/β-TCP/CNT) composites were prepared by freeze-thaw method,and the effects of CNT addition on the porosity and mechanical properties of CP/CNT composite materials were investigated.The results show that adding an appropriate amount of CNT can effectively reduce the pore size and porosity of PVA/β-TCP/CNT porous composites ensure the formation of a denser porous structure in the porous polyvinyl alcohol composites.When the CNT addition amount is 0.3%~0.5%,the porosity of the composites is the lowest,about 82%.After adding CNT,the elastic modulus and tensile strength of PVA/β-TCP/CNT porous composites were significantly improved,and the swelling of PVA/β-TCP/CNT porous composites is significantly decreased.When the CNT addition is 0.3%,the elastic modulus and tensile strength of the composites reach 2 245.08 MPa and 6.61 MPa,respectively.The prepared PVA/β-TCP/CNT porous composites can meet the requirements of medical biomaterial polymer scaffolds.