摘要
利用傅里叶变换红外技术(FT-IR)首先阐明了本文工作中的聚氨酯氢键缔合程度或微相分离程度与热历史无关,只与样品所处温度有关。其次,利用差示扫描量热法(DSC)探究了升降温过程中出现的热效应,发现热效应所对应的硬段缔合结构与聚合物结晶行为非常相似,例如有缔合核存在下的快速生长、硬段较多时的快速生长、等温退火后生成特定的缔合结构等。综合以上实验结果可以发现,这些缔合结构的行为非常类似于高分子晶体。但与传统观点不同的是,微相分离与这些潜在的类结晶行为是两个独立的过程。
Hydrogen bond association,microphase separation,and crystallization in polyurethane have not previously been clearly distinguished and explained.This work uses FT-IR spectroscopy to confirm that the degree of hydrogen bonding in polyurethane and the degree of microphase separation are independent of the thermal history and only related to the temperature at which the sample was treated.Using the DSC method,the thermal effects appearing during the heating and cooling process were then explored.It was found that the hard segment associated structure corresponding to the thermal effect is very similar to the crystallization behavior of the polymer,as shown,for example,by the rapid growth in the number of associated cores,the rapid growth in the number of hard segments,and the formation of a specific associated structure after isothermal annealing.Combining these experimental results shows that the behavior of these associated structures is very similar to polymer crystals,and that microphase separation and potential crystallization are two separate processes.
作者
孔正阳
应邬彬
胡晗
王凯
尹静波
张若愚
KONG ZhengYang;YING WuBin;HU Han;WANG Kai;YIN JingBo;ZHANG RuoYu(School of Materials Science and Engineering,Shanghai University,Shanghai 200444;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第2期81-88,共8页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金(51773218/11775195)
中国科学院青年创新促进会(2018338)
浙江省重点研究发展计划(2018C03G3220872)。
关键词
聚氨酯
微相分离
硬段
缔合
硬相区
polyurethane
microphase separation
hard segment
association
hard domain
