Results 181 to 190 of about 23,452,503 (249)

Dramatically Accelerating II-I Crystal Phase Transition of Polybutene‑1 by in Situ Incorporation of H-Shape Long-Chain-Branching Structures.

Macromolecular rapid communications
This communication reports an effective strategy helping address the long-troubling melt processing issue of isotactic polybutene-1 (i-PB) caused by its extremely slow II-I crystal phase transition.
Huiping Yu, Jin-Yong Dong
semanticscholar   +1 more source

Differential thermal analysis of polybutene‐1

Journal of Polymer Science Part C: Polymer Symposia, 1964
AbstractThe three polymorphic forms of polybutone‐1 may be easily characterized by DTA: Form I has a DTA peak near 132°C; Form II has a peak near 118°C; and Form III has doublet peaks at 104° and 118°C. The kinetics of the room temperature transformation of Form II to Form I have been qualitatively investigated by DTA.
Bert H. Clampitt, Richard H. Hughes
openaire   +2 more sources

Form II to form I transition in solution-crystallized isotactic polybutene-1.

Soft Matter
Different polymer chains in a solution or melt have different conformations with corresponding entropy at each moment, which would be confined after crystallization.
Peng Fu, Jiaxin Huo, Jingqing Li, C. De Rosa, Shichun Jiang   +4 more
semanticscholar   +1 more source

Radiation Chemistry of Polybutene-1

1996
Molecular weight changes and gel content measurements of moderately isotactic polybutene-1 following gamma irradiation at ambient temperature, show that both scission and crosslinking occur with G values of 3.2 and 1.0 respectively. 13C NMR shows there is also a loss of stereoregularity.
Busfield, W K, Watson, Gregory S
openaire   +2 more sources

Solution history effects in polybutene-1

Journal of Macromolecular Science, Part B, 1984
Abstract The crystal structure and helical conformation of polybutene-1 crystallized from dilute solution is shown to be a function of the crystal structure before dissolution, the maximum temperature in solution attained before cooling to the crystallization temperature, and the time at that maximum temperature.
K. W. Chau, Phillip H. Geil
openaire   +2 more sources

Crystallization of forms I′ and form II of polybutene-1 in stretched polypropylene/polybutene-1 blends

Polymer, 2019
Abstract In this work, the effects of orientated crystal morphology of polypropylene (PP) induced by tensile stretching on the subsequent crystallization behavior of polybutene-1 (PB-1) in the incompatible PP/PB-1 (50/50) blends were studied. When the PP/PB-1 blends were stretched at a temperature above melting temperature (Tm) of PB-1 but below the ...
Yao Xu, Yaping Ma, Chenguang Liu, Yongfeng Men, Aihua He   +4 more
openaire   +2 more sources

High pressure dilatometry on polybutene-1

Colloid and Polymer Science, 1983
High pressure dilatometry is used to study the melting processes and the melt of isotactic polybutene-1. Evaluating a great number of isobaricV(T)-curves determined in the range of a few hundred bar the pressure dependence of the melting temperature is accurately determined for modifications I and II.
U. Leute, W. Dollhopf
openaire   +2 more sources

Deformation of polybutene-1 crystal aggregates

Journal of Macromolecular Science, Part B, 1970
Abstract The plastic deformation of polybutene-1 crystals on a uniaxially drawn substrate has been studied using an electron microscope. Crystals with hexagonal morphology and crystal structure, with orthorhombic structure and with square morphology were investigated.
D. R. Morrow, A. E. Woodward
openaire   +2 more sources

Glass-Transition-Temperature-Independent Form II to I Phase Transition of Low-Molar-Mass Isotactic Polybutene-1

, 2021
Temperature-dependent form II to I transition in isothermally crystallized low-molar-mass polybutene-1 has been investigated by means of fast scanning calorimetry.
Peiru Liu, Yongfeng Men
semanticscholar   +1 more source

Toughening of polybutene-1 with form I′ induced by rapid pressurization

CrysteEngComm, 2021
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.
Yanping Liu, Yingchao Wang, Hongyu Zhang, Yuewen Wu, Shuo Zhao, Qian Li, Chunguang Shao, Zhen Wang   +7 more
semanticscholar   +1 more source