Mechanical Characteristics of PVA/STMP Hydrogel in Tensile and Unconfined Compression

摘要：

Hydrogels based on Poly(vinyl alcohol) (PVA) were synthesized using the combining method of chemical agent and freezing-thawing cycle. Sodium Trimetaphosphate (STMP) is a kind of crosslinking agent in this reaction. The resulting hydrogels were characterized in terms of tensile properties and compression stress-strain testing. The influences of STMP and water content on mechanical properties of hydrogels were investigated. It is suggested that PVA hydrogel has excellent tensile strength, higher elongation at break and viscoelastic materials stress-strain curve. Tensile strength of specimens without STMP increases from 4 to 6.8 MPa, as well as elongation increase from 300％ to 458％, respectively. When the strain changes from 10％ to 50％, tangent compressive modulus dramatically increases from 0.58 to 9.9 MPa for hydrogels with 80wt ％ water and 0.41 to 5.4 MPa for 85wt ％ water. Meanwhile, the addition of STMP can further improve the mechanical properties of PVA hydrogel.

关键词： PVA hydrogel STMP tensile strength elongation at break tangent compressive modulus

作者: Wei Zhu Jin Gao Xiaogang Li Junli Lin Hanhui Cao Bai-tian Sun

作者单位: Institute of Advanced Materials and Technology, University of Science & Technology Beijing,Beijing, Harbin Binhui Group

会议类型: 国际会议

会议名称: 2011 International Conference on Mechatronics and Applied Mechanics(2011年机电一体化与应用力学国际会议 ICMAM 2011)

会议地点: 香港

会议语种:英文

页码: 1372-1375

在线出版日期: 2011-12-27（万方平台首次上网日期，不代表论文的发表时间）