Investigation of the synergistic effect of melt-extension and nanofiller on the crystal–crystal phase transition from form II to I of isotactic polybutene-1

Zhang, Yuru; Wei, Wenjia; Liu, Yi; Ji, Youxin; Su, Fengmei; Liu, Chuntai

doi:10.1039/d2sm00841f

Cited by 2 publications

(2 citation statements)

References 70 publications

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“…A homemade two-drum extensional rheometer , was utilized to load the extensional flow field. As shown in Figure a, the sample was fixed to the two gear drums with clamps and was stretched by rotating the gear drums in the opposite direction.…”

Section: Methodsmentioning

confidence: 99%

Memory Effect on the Form II to I Phase Transition of Isotactic Polybutene-1 in a Flow Field

Wei,

Ji,

Zhang

et al. 2023

Macromolecules

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In this work, the memory effect on the phase transition from form II to I of isotactic polybutene-1 (iPB-1) in the flow field is studied with in situ wide-angle X-ray diffraction (WAXD) techniques combined with a homemade two-drum extensional rheometer. Heterogeneous melt containing residual form II seeds was prepared by heating the form II crystal to different melting temperatures (T m ). The results show that the memory effect has a limited contribution to the phase transition kinetics without melt extension. However, the memory effect can be activated by a flow field. The phase transition kinetics shows obvious dependence on T m , which increases with the decrease of T m . In addition, the result shows that the melt memory and flow field mainly accelerate the nucleation rather than the growth of form I. As form II with a high orientation degree is induced in the flow field, it is speculated that the higher nucleation rate of form I during phase transition is attributed to the large number of tie molecules distributed in the oriented form II lamellae, which promote the nucleation of form I. In summary, the coupling of memory effect and melt extension plays an essential role in accelerating the phase transition of iPB-1.

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Section: Methodsmentioning

confidence: 99%

Memory Effect on the Form II to I Phase Transition of Isotactic Polybutene-1 in a Flow Field

Wei,

Ji,

Zhang

et al. 2023

Macromolecules

Self Cite

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show abstract

“…2 Therefore, an efficient approach of quickly obtaining a trigonal phase remains a challenge. Previous studies have revealed that II-I phase transition can be accelerated by high pressure, 1,15,16 proper control of temperature, [17][18][19][20] solvent, 21,22 supercritical CO 2 , 16,23,24 blending, [25][26][27][28] change of macromolecular structures, [29][30][31][32][33] application of external forces, [34][35][36][37] etc. Among these methods, introducing the foreign co-units into the main chain of PB is effective to change the molecular structure and tune the crystal polymorphism.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and phase transition of butene/propylene copolymers

Yuan

et al. 2023

CrystEngComm

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Investigation of the synergistic effect of melt-extension and nanofiller on the crystal–crystal phase transition from form II to I of isotactic polybutene-1

Abstract: New questions and conjectures are raised on the crystal-crystal phase transition of isotactic polybutene-1 (iPB-1) containing nanofiller in the flow field. In this work, we investigate the phase transition from...

Cited by 2 publications

References 70 publications

Memory Effect on the Form II to I Phase Transition of Isotactic Polybutene-1 in a Flow Field

Memory Effect on the Form II to I Phase Transition of Isotactic Polybutene-1 in a Flow Field

Crystallization and phase transition of butene/propylene copolymers

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