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运用紫外-可见分光光度法分别考察了聚N,N-二乙基丙烯酰胺(PDEA)和N-羟甲基丙烯酰胺(NHMAA)与DEA的共聚物P(DEA-co-NHMAA)稀水溶液相分离行为.结果发现,当P(DEA-co-NHMAA)中NHMAA的质量分数小于5.25%时,随着NHMAA含量的增加,其最低临界溶解温度(TLCS)下降;当NHMAA的含量大于5.25%时,随着NHMAA含量的增加,其TLCS上升;与PDEA相比,P(DEA-co-NHMAA)相分离行为的浓度依赖性减弱;PDEA和P(DEA-co-NHMAA)从无规线团(coil)到蜷曲球(globular)的突然转变与从globular到coil的逐渐转变机理不同.据此提出了P(DEA-co-NHMAA)在稀水溶液中相变的分子机理.
The aqueous solutions of poly (N, N-diethylacrylamide (PDEA) and N-methylolacrylamide (NHMAA) and DEA copolymer P (DEA-co-NHMAA) diluted aqueous solution The results showed that when NHMAA content in P (DEA-co-NHMAA) was less than 5.25%, the lowest critical solution temperature (TLCS) decreased with the increase of NHMAA content. When NHMAA content was more than 5.25% , The TLCS increased with the increase of NHMAA content. Compared with PDEA, the phase separation behavior of P (DEA-co-NHMAA) decreased in a concentration-dependent manner. PDEA and P (DEA-co-NHMAA) The abrupt change of globular to globular differs from the gradual change from globular to coil, and the molecular mechanism of P (DEA-co-NHMAA) phase transition in dilute aqueous solution is proposed.