BES-Na磺酸型聚氨酯复合水凝胶的制备与性能研究

Preparation and properties of BES-Na sodium sulfonate polyurethane composite hydrogel

以N,N-双(2-羟乙基)-2-氨基乙磺酸钠(BES-Na)和二羟甲基丙酸(DMPA)为亲水扩链剂,原位聚合制备了一系列磺酸型水性聚氨酯(SWPU);再将丙烯酰胺(AM)引入SWPU中乳液聚合制备了一系列BES-Na磺酸型聚氨酯复合水凝胶(SWPUH)。采用傅里叶变换红外光谱(FTIR)表征了SWPUH的结构,研究了BES-Na含量对SWPUH水凝胶的溶胀性能、p H敏感性、离子强度敏感性以及力学性能的影响。结果表明,SWPUH6溶胀比最大,为33. 12,且较SWPUH1平衡溶胀比提升了50. 20%; SWPUH水凝胶还具有多重敏感性,BES-Na的加入能改善水凝胶的酸碱稳定性,且在不同离子强度溶液中,仍然具有较高的溶胀性能。另外,SWPUH水凝胶还具有优异的力学性能,其中SWPUH6水凝胶压缩强度达到最大3. 42 MPa,较SWPUH1压缩强度提升了约4. 5倍,拉伸强度最大值为0. 33 MPa,断裂伸长率最大达到了774%,相比SWPUH1分别提升了175%和59. 3%。

A series of sulfonic acid type water-based polyurethane(SWPU)were prepared by in situ polymerization with using N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate(BES-Na)and dimethylolpropionic acid(DMPA)as hydrophilic chain extenders;A series of BES-Na sulfonic acid type polyurethane composite hydrogel(SWPUH)was prepared by emulsion polymerization with introducing SWPU with acrylamide(AM).The structure of SWPUH was characterized by fourier transform infrared spectroscopy(FTIR).The effects of BES-Na contents on the swelling properties,pH sensitivity,ionic strength sensitivity and mechanical properties of SWPUH hydrogel were also studied.The results showed that SWPUH6 had a maximum swelling ratio of 33.12 and an increased equilibrium swelling ratio of 50.20%compared with that of SWPUH1.SWPUH hydrogels also had multiple sensitivities.The addition of BES-Na could improve the acid-base stability of hydrogel.Different ionic strength solution,still has a high swelling performance.In addition,SWPUH hydrogel also has excellent mechanical properties,including SWPUH6 hydrogel compressive strength up to 3.42 MPa,compared with SWPUH1 compressive strength increased by about 4.5 times,the tensile strength reached a maximum of 0.33 MPa,elongation at break up to 774%,up 175%and 59.3%over SWPUH1 respectively.