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Thermal and mechanical properties of short‐segment block copolyesters and copolyether–esters
Wiley - Tập 23 Số 10 - Trang 2119-2147 - 1985
Janis L. Castles, Michael Vallance, J. M. McKenna, Stuart L. Cooper
AbstractThe effects of chain structure and processing variables on the microstructure and linear viscoelastic behavior of a series of copolyether–ester block polymers are described. In addition, the random copolyester analogs of the hard block are examined. The ester segments are composed of two isomers, poly(tetramethylene terephthalate) (PTMT) and poly(tetramethy...... hiện toàn bộ
Superstructure in segmented polyether–urethanes
Wiley - Tập 13 Số 3 - Trang 455-476 - 1975
Yaw‐Jen Chang, Garth L. Wilkes
AbstractThe morphology of several series of segmented polyether–urethanes was studied. The “hard” segments contained urethane and urea linkages formed by 4,4′‐dicyclohexylmethane diisocyanate (Hylene W) and selected aliphatic and aromatic monomeric diamines (DA). The “soft” segments were composed of oligomeric poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO)...... hiện toàn bộ
Macromolecular nucleation
Wiley - Tập 12 Số 2 - Trang 255-263 - 1974
Bernhard Wunderlich, Aspy Mehta
AbstractThe rate‐determining step of crystallization of macromolecules from melt and solution is shown to be molecular nucleation. Molecular nucleation is described by using classical nucleation theory. Good agreement is found between the molecular nucleus size and the critical length of the rejected species. Molecular nucleation has a higher free‐energy barrier th...... hiện toàn bộ
The question of Cp − Cv for crystalline polyethylene
Wiley - Tập 11 Số 2 - Trang 397-398 - 1973
Vera Bares, Bernhard Wunderlich
An analysis of the crystallization behavior of poly(ethylene oxide)/poly(methyl methacrylate) blends by spectroscopic and calorimetric techniques
Wiley - Tập 22 Số 7 - Trang 1331-1342 - 1984
Xuanrong Li, Shaw Ling Hsu
AbstractInfrared spectra in conjunction with calorimetric measurements have been used to follow the crystallization process and microstructural changes of poly(ethylene oxide) (PEO) in poly(ethylene oxide) and poly(methyl methacrylate) (PMMA) blends. We have given particular attention to compositions containing low PEO concentrations. The crystallization behavior a...... hiện toàn bộ
The heat of fusion of 66 nylon
Wiley - Tập 22 Số 9 - Trang 1615-1621 - 1984
Howard W. Starkweather, P. Zoller, Glover A. Jones
AbstractThe heat of fusion ΔHf of 66 nylon has been determined by use of the Clapeyron equation. Measurements of ΔHf and the unit‐cell parameters on molding pellets show that this material contains the α2
Hydrogen bonding in nylon 66 and model compounds
Wiley - Tập 23 Số 3 - Trang 537-555 - 1985
Dana Garcia, Howard W. Starkweather
AbstractFourier‐transform infrared spectroscopy was used to study the hydrogen bond‐breaking process in nylon 66 and two model compounds. The resulting enthalpy and entropy values indicated that while there is no interaction between adjacent amide groups in the polymer chain, there is, nevertheless, a substantial cooperative effect in the transverse hydrogen bond d...... hiện toàn bộ
A model for permeation of mixed gases and vapors in glassy polymers
Wiley - Tập 19 Số 10 - Trang 1513-1530 - 1981
William J. Koros, R. T. Chern, V. Stannett, H. B. Hopfenberg
AbstractA model is discussed which explains reported complex effects of feed composition and pressure on component permeabilities in high‐pressure gas separators based on glassy polymer membranes. A special form of Fick's law which accounts for the fact that penetrants in glassy polymers sorb into and diffuse through two different molecular environments provides th...... hiện toàn bộ
Diffusion‐controlled formation of porous structures in ternary polymer systems
Wiley - Tập 17 Số 3 - Trang 477-489 - 1979
Claude Cohen, G. B. Tanny, Stephen Prager
AbstractWe propose a theory for the appearance of two‐phase structures during the formation of polymer membranes from a casting solution immersed in a coagulant bath. Our model is based on diffusion induced phase separation at the spinodal in the ternary nonsolvent‐solvent‐polymer system. A simplified treatment of the interdiffusion process by the diffusion layer m...... hiện toàn bộ
Synthesis and solution properties of linear, four‐branched, and six‐branched star polyisoprenes
Wiley - Tập 12 Số 12 - Trang 2521-2533 - 1974
N. Hadjichristidis, Jacques Roovers
AbstractA number of linear, four‐ and six‐branched regular star polyisoprenes were synthesized by anionic polymerization techniques in benzene using lithium as the counterion and polyfunctional silicon chloride compounds as the coupling agents. Light‐scattering measurements in dioxane were performed in order to establish Θ solvent conditions. Determinations of the ...... hiện toàn bộ
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