Crystallization of hard segments in MDI/BD-based polyurethanes deformed at elevated temperature and their dependence on the MDI/BD content

doi:10.1016/j.eurpolymj.2017.10.014

CORC > 化学研究所 > 中国科学院化学研究所

	Crystallization of hard segments in MDI/BD-based polyurethanes deformed at elevated temperature and their dependence on the MDI/BD content
	Li, Xuke 1; Lu, Ying 1; Wang, Hai 1; Poeselt, Elmar 2; Eling, Berend 2; Men, Yongfeng 1
刊名	EUROPEAN POLYMER JOURNAL
	2017-12-01
卷号	97 页码:423-436
关键词	Thermoplastic Polyurethane Hard Segment Content Crystal Form transFormation Strain-induced Crystallization Periodic Microfibrils Hard Domain Elongation
ISSN号	0014-3057
DOI	10.1016/j.eurpolymj.2017.10.014
英文摘要	Morphological variation of thermoplastic polyurethanes (TPUs) with different hard segment contents (HSCs) stretched at 100 degrees C higher than the T-g of hard domain was monitored by in-situ wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) techniques. WAXS patterns reveal that the crystalline modification of TPUs with high HSCs transforms from paracrystal (termed as form I) to form III of 4,4'-methylene diphenyl diisocyanate/1,4-butanediol (MDI/BD) segment, and TPUs with low HSCs show the direct transition from amorphous MDI/BD packing to form III packing. The form III crystals are fibrillar hard domains. Chord distribution functions (CDFs) computed from the SAXS patterns were employed to illustrate the domain topology. The streak-like CDF peaks off the meridian indicate the existence of cylindrical microfibrils which are composed of very low inhomogeneities between the destructured hard domains and stretched soft domains along the straining direction. These microfibrils of TPUs with low HSCs present a periodically lateral correlation. interface distribution function (IDF) and chord length distribution (CLD) were computed from Bonart's longitudinal and transverse projection to quantify the domain stacking and microfibril arrangement respectively. The average size of hard domains increases up to a constant size with the increasing macroscopic strain which may be related to the maximal sequence length of hard segment. The average size of soft domain also reaches up to a constant size at large strain that is smaller than the fully-extended length of soft segment. The variation of domain size is different from deformation at room temperature. The HSC affects the behaviors of morphological evolution significantly.
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000419415800044
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45403]
专题	中国科学院化学研究所
通讯作者	Li, Xuke; Men, Yongfeng
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Renmin St 5625, Changchun 130022, Jilin, Peoples R China 2.BASF Polyurethanes GmbH, GMP LT, Elastogranstr 60, D-49448 Lemforde, Germany
推荐引用方式 GB/T 7714	Li, Xuke,Lu, Ying,Wang, Hai,et al. Crystallization of hard segments in MDI/BD-based polyurethanes deformed at elevated temperature and their dependence on the MDI/BD content[J]. EUROPEAN POLYMER JOURNAL,2017,97:423-436.
APA	Li, Xuke,Lu, Ying,Wang, Hai,Poeselt, Elmar,Eling, Berend,&Men, Yongfeng.(2017).Crystallization of hard segments in MDI/BD-based polyurethanes deformed at elevated temperature and their dependence on the MDI/BD content.EUROPEAN POLYMER JOURNAL,97,423-436.
MLA	Li, Xuke,et al."Crystallization of hard segments in MDI/BD-based polyurethanes deformed at elevated temperature and their dependence on the MDI/BD content".EUROPEAN POLYMER JOURNAL 97(2017):423-436.