Results 171 to 180 of about 27,269,029 (232)

Spontaneous Form II to I Transition in Low Molar Mass Polybutene-1 at Crystallization Temperature Reveals Stabilization Role of Intercrystalline Links and Entanglements for Metastable Form II Crystals

Macromolecules, 2018
As for the solid–solid transformation from form II to form I in polybutene-1, the intercrystalline links in amorphous phase and the temperature difference between crystallization and phase transition were thought to be essential in previous studies for ...
Yongna Qiao, Fei Yang, Ying Lu, Peiru Liu, Yue-sheng Li, Yongfeng Men   +5 more
semanticscholar   +1 more source

Isotactic Polybutene-1 Single Crystals: Morphology

Journal of Applied Physics, 1964
Three crystalline modifications of isotactic polybutene-1 have been obtained from dilute solution in a variety of habits. These three crystalline modifications are: (a) tetragonal, (b) ``untwinned'' hexagonal, and (c) orthorhombic. The structure of the orthorhombic polymorph has not previously been reported.
V. F. Holland, Robert L. Miller
openaire   +1 more source

Crystallization studies on deformed polybutene‐1 melts

Polymer Engineering & Science, 1971
AbstractAn apparatus was designed and built which allowed an investigation concerning the morphology and kinetics of crystallization of a deformed polybutene‐1 melt. The polymer was quenched from a temperature above its melting point to one of two crystallization temperatures.
A. Wereta, C. G. Gogos
openaire   +1 more source

Morphological Evidence for the Two-Step II–I Phase Transition of Isotactic Polybutene-1

Macromolecules, 2019
Thin films of isotactic polybutene-1 (iPBu) with large lathlike flat-on form II crystals were prepared by isothermal crystallization from melt at 105 °C.
Rui Xin, Zhixin Guo, Yunpeng Li, Xiaoli Sun, Meiling Xue, Jie Zhang, Shouke Yan   +6 more
semanticscholar   +1 more source

Thermodynamic properties of polybutene‐1 and butene‐1

Journal of Polymer Science Part A-2: Polymer Physics, 1967
Abstract : Using published specific heat data, the entropy, enthalpy, and Gibbs free energy of polybutene-1 (PB) were calculated over the temperature range 0 to 315K. The encraty, C sub p/T vs. T, calculated for PB exhibits a maximum at 60K and a small inflection at about 250K, which is associated with the glass transition.
R. W. Warfield, M. C. Petree
openaire   +1 more source

Local deformation in stretched polybutene‐1 spherulites

Journal of Polymer Science Part A-2: Polymer Physics, 1970
AbstractThe orientation of crystals in spherulites of modifications I and II of polybutene‐1 was studied by micro‐x‐ray diffraction. Changes in such micro‐x‐ray diffraction patterns were measured in various regions of the spherulites as a function of strain and time. The relationship between micro‐x‐ray diffraction from parts of spherulites and macro‐x‐
R. Y. Yee, R. S. Stein
openaire   +1 more source

Spherulite growth of polybutene-1 in a thermal gradient

Polymer Bulletin, 1990
Polybutene-1 can form oriented spherulites when crystallized in a thermal gradient because the nucleation is suppressed in the high temperature region and the spherulite growth is obstructed except towards the high temperature. The difference of the growth rate in different radial directions leads to the change of the lamellar growth direction from ...
Y. Huang, J. Petermann
openaire   +1 more source

Dilute solution properties of isotactic polybutene-1

European Polymer Journal, 1969
Abstract Viscosity measurements have been made on fractions of a highly isotactic polybutene-1 sample in cyclohexane and its mixtures with the poor solvent n -propanol at various temperatures. Light scattering measurements were made in cyclohexane at 35°.
K. Satyanarayana Sastry, R.D. Patel
openaire   +1 more source

The enhancement of polybutene-1 crystallinity in polybutene-1/polypropylene blends

Journal of Polymer Science Part C: Polymer Letters, 1987
Mao-Song Lee, Show-An Chen
openaire   +1 more source

Stretching-Induced Melting and Recrystallization Polymorphism Revealed in Polybutene-1

Macromolecules, 2023
Wei Li, Dai Zhang, Chunjing Qv, Rui-Xiong Zhao, Zhenzhen Ma   +4 more
semanticscholar   +1 more source