摘要
研究了聚丙烯酸、聚丙烯胺、聚乙烯醇三种亲水性高分子对冰重结晶过程的影响。结果表明,随着溶液浓度的增加,三种高分子对冰重结晶的抑制作用均逐渐增强。不同侧链基团会影响高分子对冰重结晶过程的调控效果,聚丙烯胺和聚丙烯酸没有明显抑制冰重结晶的效果,而聚乙烯醇具有很强的抑制冰重结晶的能力。对不同醇解度的聚乙烯醇研究发现,聚乙烯醇抑制冰重结晶的效果会随着醇解度的提高而不断增强。通过研究水分子的质子自旋-自旋弛豫时间(T2)发现:高羟基含量的聚乙烯醇可以更加有效地限制水的扩散运动,从而抑制冰重结晶。
The effect of poly（acrylic acid） （PAA）, poly（allylamine） （PEI） and poly（vinyl alcohol） （PVA） on the ice recrystallization （IR） were studied. The results showed that the IR inhibition activity gradually increased with the increase of polymer solution concentration. Compared with the weak IR inhibition activity of PAA and PEI, PVA was a very effective inhibitor of IR. PVA with higher alcoholysis degree could inhibit IR much more effectively. The water mobility was detected by ~H-NMR, namely, water proton spin-spin relaxation times （T2）. As the proportion of hydroxyl groups increased, the IR inhibition activity of PVA increased due to the reduced mobility of water molecules.
出处
《高分子通报》
CAS
CSCD
北大核心
2016年第9期156-161,共6页
Polymer Bulletin
基金
国家973计划(2012CB933801
2013CB933004)
国家自然科学基金(51436004
21421061
2150030233)
关键词
亲水性高分子
冰重结晶抑制
水分子动力学
Hydrophilic polymers
Ice recrystallisation inhibition
Water molecular dynamics
