Journal ArticleDOI
Thermoplastic elastomers by hydrogen bonding 1. Rheological properties of modified polybutadiene
R. Stadler,L. de Lucca Freitas +1 more
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In this paper, a polybutadiene of narrow molecular weight distribution was modified using 4-phenyl-1, 2,4-triazoline-3,5-dione.Abstract:
Polybutadiene of narrow molecular weight distribution was modified using 4-phenyl-1, 2,4-triazoline-3,5-dione. The degree of modification was 1% and 2% with respect to the repeating units. Hydrogen bonding between the highly polar urazole groups thus incorporated into the polymer gives rise to the formation of a thermoreversible elastomeric network. Dynamic mechanical measurements in the temperature range between 220 and 330 K support the picture of the thermoreversible hydrogen bond interaction. The rubber elastic plateau is shifted to higher temperatures and lower frequencies. The increase in the plateau modulus cannot be attributed solely to the contribution of the network structure but is mainly a consequence of the broadening of the relaxation time spectrum in the modified samples. From the temperature dependence of the shift factors log(aT) it is concluded that the general WLF approach fails. The strong temperature dependence of the apparent activation energy of flow is a consequence of the temperature dependence of the hydrogen bond interaction.read more
Citations
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Self-healing and thermoreversible rubber from supramolecular assembly
TL;DR: The design and synthesis of molecules that associate together to form both chains and cross-links via hydrogen bonds and the system shows recoverable extensibility up to several hundred per cent and little creep under load are designed and synthesized.
Journal ArticleDOI
Self‐Healing Polymers via Supramolecular Forces
TL;DR: This Review describes recent examples and concepts of supramolecular polymers based on hydrogen bonding, π-π interactions, ionomers, and coordinative bonds, thus convincingly discussing the advantages and versatility of these supramolescular forces for the design and realization of self-healing polymers.
Journal ArticleDOI
Physical chemistry of supramolecular polymer networks
TL;DR: This critical review summarizes the current state of the art in the physical-chemical characterization of supramolecular networks and relates this knowledge to that about classical, covalently jointed and crosslinked networks.
Journal ArticleDOI
Model Transient Networks from Strongly Hydrogen-Bonded Polymers
TL;DR: In this article, random copolymers consisting of n-butyl acrylate backbones with quadruple hydrogen-bonding side chains based on 2-ureido-4[1H]-pyrimidinone (UPy) have been synthesized via controlled radical polymerization and postpolymerization functionalization.
Journal ArticleDOI
Supramolecular polymers from linear telechelic siloxanes with quadruple- hydrogen- bonded units
J.H.K.K. Hirschberg,Felix Hugo Beijer,H.A.M. van Aert,Pieter C. M. M. Magusin,Rint P. Sijbesma,E. W. Meijer +5 more
TL;DR: In this paper, two ureidopyrimidone (UPy) functional groups are associated via quadruple hydrogen bonds in a donor-donor-acceptor−acceptor −acceptor (DDAA) array.
References
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Book
Viscoelastic properties of polymers
TL;DR: In this article, the authors describe the nature of Viscoelastic behavior of polymeric systems and approximate relations among the linear Viscoels and approximate interrelations among the Viscelastic Functions.
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Evidence of nonaffine and inhomogeneous deformation of network chains in strained rubber-elastic networks by deuterium magnetic resonance
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Polymer Compatibilization Through Hydrogen Bonding
TL;DR: Partially modified polystyrene containing vinyl phenyl hexafluorodimethyl carbinol was mixed with a number of counterpolymers, including poly(vinyl-acetate), poly(methyl methacry1 ate), poly (ethy] methacelate, poly (n-butyl methace late), polyviny] methyl ether, poly(2,6 dimethyl-1,4 phenylene oxide), bisphenol A polycarbonate poly(styrene-co-acryloni-trile), poly poly(dimethyl
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Orientation and relaxation in uniaxially stretched poly(vinyl methyl ether)-atactic polystyrene blends
TL;DR: The influence of strain rate and temperature of stretching on orientation of both polymer chains in blends containing up to 25% PVME has been studied in this article, and the relaxation master curves at a reference temperature T = T g +40°C have also been determined.