Toughening of polybutene-1 with form I′ induced by rapid pressurization. Issue 2 (1st December 2021)

• Record Type: Journal Article
• Authors: Liu, Yanping; Wang, Yingchao; Zhang, Hongyu; Wu, Yuewen; Zhao, Shuo; Li, Qian; Shao, Chunguang; Wang, Zhen
• Is Part Of: CrystEngComm. Volume 24:Issue 2(2022)
• Page Start: 300
• Page End: 310
• Publication Date: 2021-12-01
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d1ce01228b
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Combined with in situ wide angle X-ray diffraction, the mechanical properties of polybutene-1 with rapid pressurization are investigated. The toughness of polybutene-1 can be improved significantly by forms I/I′ produced by rapid pressurization. Abstract : Rapid pressurization (RP) induced crystallization of polybutene-1 (PB-1) is performed at different temperatures of 90 °C, 125 °C and 180 °C under various pressures. The mechanical properties of RP PB-1 are investigated with a tensile device and in situ wide-angle X-ray diffraction (WAXD) is used to record the structural evolution during deformation. Using differential scanning calorimetry (DSC) and WAXD, it is found that RP in the melt state produces forms I/I′, while stable form I with a high melting point is generated by RP at 90 °C. All three RP PB-1 samples at 180 °C have lower melting temperature of form I crystals, and their fracture strain is nearly three times that of normal form I. P1T90 shows a small fracture strain equivalent to that of normal form I, because RP at 90 °C only accelerates the phase transition from form II to I. Form I′ that directly crystallized from the melt state and the thinner lamellae of form I contribute to excellent toughness, which are conducive to the molecular orientation along the stretching direction. The optimization of toughness caused by rapid pressurization provides a new idea for the regulation of the mechanical properties of PB-1.