摘要
本文在前文实验结果的基础上采用热台X射线衍射法、流变测定法,进一步说明DSC测得的相转变峰机理和偏光显微镜下的结构转变机理.结果表明,热X射线衍射法测得强度及峰位的变化规律能很好地说明DSC曲线在260℃时的转变峰确为体系的熔融峰;同样,粘弹参数随温度的变化规律又能很好地说明和解释偏光显微镜下的(?)区分离现象;小角X射线衍射结果表明,其相态在260～320℃为向列型液晶,说明共聚酯体系在液晶温度区不存在近晶型相.
A series of liquid crystal phase structure of p-hydroxybenzoate/ethylene terephthalate copolyester at different temperatures is investigated on the base of last article by means of hot WAXD,SAXD as well as dynamic viscoelastometry. From the hot X-ray curves, relation between maximal values of diffraction curves representing the molecular density and temperatures is obtained. The temperature at which the small crystals change into liquid crystal is 270℃-280℃. The measurement of small angle X-ray shows that there is no diffraction peak within the small angle range and the system is in nematic liquid crystal phase rather than smectic phase within the temperature range.
出处
《中国纺织大学学报》
CSCD
1992年第5期15-20,共6页
Journal of China Textile University
关键词
液晶
相结构
共聚物
变性纤维
liquid crystal
phase structure
copolymer
copolymer fibres
p-hydroxybenzoate/ethylene terephthalate
copolyester
