TY - JOUR
T1 - Crystallisation of iPB-1 based on preserved helix conformation
AU - Li, Jingqing
AU - Christiansen, Jesper de Claville
AU - Yu, Donghong
AU - Jiang, Shichun
PY - 2020/3
Y1 - 2020/3
N2 - The intriguing problem during polymer crystallisation is to understand the crystal formation and transition, in particular the initiation in a liquid melt close to solid crystals and one solid crystal close to another. Polymorphic isotactic polybutene-1 (iPB-1) usually crystallises into kinetically favoured metastable form II from melt and then spontaneously transits to thermodynamically stable form I. Keeping in mind that polymer crystallisation is controlled by temperature-dependent prior chain conformation formation, we first successfully conserved form-I-favoured 3/1 helix conformation at low temperatures and determined its decomposition temperature as Td,3/1 = 132 °C. The detailed temperature-dependent helix conformation evolution of iPB-1 during the cooling/heating processes was outlined and the subsequent easy direct form I crystallisation via necessary diffusion and alignment of the preserved 3/1 helix conformation was deduced. The results would be helpful to understand the helix conformation roles in polymer crystallisation, polymorph selection and crystal transition.
AB - The intriguing problem during polymer crystallisation is to understand the crystal formation and transition, in particular the initiation in a liquid melt close to solid crystals and one solid crystal close to another. Polymorphic isotactic polybutene-1 (iPB-1) usually crystallises into kinetically favoured metastable form II from melt and then spontaneously transits to thermodynamically stable form I. Keeping in mind that polymer crystallisation is controlled by temperature-dependent prior chain conformation formation, we first successfully conserved form-I-favoured 3/1 helix conformation at low temperatures and determined its decomposition temperature as Td,3/1 = 132 °C. The detailed temperature-dependent helix conformation evolution of iPB-1 during the cooling/heating processes was outlined and the subsequent easy direct form I crystallisation via necessary diffusion and alignment of the preserved 3/1 helix conformation was deduced. The results would be helpful to understand the helix conformation roles in polymer crystallisation, polymorph selection and crystal transition.
KW - Conformation decomposition
KW - Preserved helix conformation
KW - iPB-1 crystallisation and polymorph selection
UR - http://www.scopus.com/inward/record.url?scp=85078116127&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2020.122209
DO - 10.1016/j.polymer.2020.122209
M3 - Journal article
SN - 0032-3861
VL - 190
JO - Polymer
JF - Polymer
M1 - 122209
ER -