摘要
用ＤＳＣ法研究了国内外不同厂家生产的工业用ＰＥＴ纤维的熔融行为，其热谱表明，一般呈现熔融双峰．实验证明，双熔融峰是由ＤＳＣ过程中纤维材料中一部分热稳定性差的结构发生重排所致．结合用ＷＡＸＤ法、ＳＡＸＳ法、双折射法、密度法获得的结构参数指出，工业用纤维的熔融行为，除受晶粒尺寸、晶粒完善程度、晶粒尺寸分布等因素的影响之外，连续网的结构也起着重要作用．另外，用ＤＳＣ法测定工业用纤维结晶度的精度还有不如人意之处．
Melting behavior of poly(ethylene terephthalate) industrial fibres from various domestic and overseas factories is studied by differential scanning calorimetric (DSC) measurements.The thermograms of polyester fibres often show double melting endotherms.This behavior has been attributed to melting of less stable crystallites followed by recrystallization during scanning in differential scanning calorimetry experiment.Combined with data obtained from wide angle X ray diffraction,small angle X ray scattering,birefringence and density,it is pronounced that the continuous network structure plays an important part on melting behavior of industrial poly(ethylene terephthalate) fibers in addition to the effect of crystal size,crystal perfection and crystal size distribution.In addition,the degree of crystallinity f c w(DSC) calculated from the heat of fusion is not very satisfying for describing crystalline weight fraction of industrial PET fibres.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1999年第2期134-140,共7页
Acta Polymerica Sinica
基金
国家自然科学基金
国家教委聚合物分子工程开放实验室资助
