含聚1,3-二氧戊环链段聚合物网络Poly(AA-b-DXL)溶胀度的影响因素研究

EFFECTS ON SWELLING BEHAVIOR OF HYDROPHILIC POLY(AA-b-DXL) NETWORKS

继报道了含聚 1,3 二氧戊环 (PDXL)链段具有pH敏感性的可解体聚合物网络Poly(AA b DXL)的制备后 ,对网络的溶胀性能进行了更为详细和深入的研究 .由PDXL与PAA两种亲水性链段组成的网络不仅具有pH敏感性 ,而且可在水中及有机溶剂中溶胀 .研究表明溶剂的溶度参数及网络的结构与组成对网络的溶胀性能有显著的影响 ;

A detailed research on poly(AA-b-DXL) networks as a continued paper was reported here. The copolymer networks poly(AA-b-DXL) as a combined two hydrophilic parts of PDXL and PAA, not only possess the pH sensitivity, but also can swell in both water and organic solvents. The effects on the swelling behavior of hydrophilic poly ( AA-b-DXL) networks were deeply reported. The results showed that the solubility parameters of solvents and constituents of the networks have a great influence on the swelling behavior of poly( A-A-b-DXL) networks. It means that the networks can reach high swelling degree when the solubility parameter of the solvent is close to either that of the PDXL segments or that of the PAA segments. A micro-phase separation structure was observed and explained. By SEM analysis, the microphase conformation can be clearly observed. No obvious microphase separation was observed when the PDXL content is much higher than that of the PAA. With increase of PAA content in the network to 50 wt% there is an obvious phase separation.