Reexamining the role of intercrystalline links in the II-I phase transition of Poly(1-butene)

doi:10.1016/j.polymer.2021.123763

	Reexamining the role of intercrystalline links in the II-I phase transition of Poly(1-butene)
	Li, Xiangyang 1; Chen, Pujing 1,2; Xu, Min 2; Ding, Jianjun 2; Zheng, Kang 2; Zhang, Xian 2; Tian, Xingyou 2
刊名	POLYMER
	2021-05-14
卷号	224
关键词	Form II to form I phase transition Intercrystalline links poly(1-butene)
ISSN号	0032-3861
DOI	10.1016/j.polymer.2021.123763
通讯作者	Li, Xiangyang(xiangyangli@issp.ac.cn)
英文摘要	Despite being studied extensively, the role of intercrystalline links has not been elucidated completely. To clarify its role, two kinds of different lengths of poly (1-butene) chains were blended with different proportions, among which only the long chain was able to form intercrystalline links. Phase transitions of these blends were monitored with time-resolved FTIR. Surprisingly, when the content of long chains reached 30% or 40%, phase transition rates were even slower than they existed alone, indicating phase transition was suppressed greatly by long chains. Adding a minority of short chains actually would also slow down the phase transition, though the effect was not as obvious as long chains. Estimation indicates that the change of enthalpy cannot compensate for the loss in conformational entropy in II-I phase transition. To ensure continuous proceeding of II-I phase transition, the role of amorphous chains is indispensable in the quiescent phase transition. Nevertheless, the role of intercrystalline links should not be undue stressed either. Analysis indicates that a transient amorphous network exists in the blends, consisting of different sizes of amorphous coils. Long chains can form larger coils because of intercrystalline links, while small coils are most likely from individual short chains. Entanglements exist between these amorphous coils, stabilizing the transient network, which would also affect phase transition significantly. When a minority of short chains are added, stress on one side of some big coils reduces. The big coils deviate from previous mass centers, slowing down its internal stress on form II crystal and thus its phase transition rate. Conversely, when a minority of long chains are added, big coils not only would lead small coils deviating from their previous mass centers, but also slow down contraction of the small coils through the entanglement, leading to a larger decrease in form I nuclei. The roles of intercrystalline links and entanglement should be considered simultaneously.
资助项目	National Natural Science Foundation of China[21774133]
WOS关键词	SOLUTION-GROWN CRYSTALS ; SOLID-STATE ; ISOTACTIC POLY(1-BUTENE) ; FORM II ; SEMICRYSTALLINE POLYMERS ; MOLECULAR SEGREGATION ; MELT CRYSTALLIZATION ; NEUTRON-SCATTERING ; POLYBUTENE-1 ; TRANSFORMATION
WOS研究方向	Polymer Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000647571700003
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/122137]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Xiangyang
作者单位	1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Solid State Phys, Key Lab Photovolta & Energy Conservat Mat, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiangyang,Chen, Pujing,Xu, Min,et al. Reexamining the role of intercrystalline links in the II-I phase transition of Poly(1-butene)[J]. POLYMER,2021,224.
APA	Li, Xiangyang.,Chen, Pujing.,Xu, Min.,Ding, Jianjun.,Zheng, Kang.,...&Tian, Xingyou.(2021).Reexamining the role of intercrystalline links in the II-I phase transition of Poly(1-butene).POLYMER,224.
MLA	Li, Xiangyang,et al."Reexamining the role of intercrystalline links in the II-I phase transition of Poly(1-butene)".POLYMER 224(2021).