Behavior of low molecular weight model HEUR associative polymers in concentrated surfactant systems

Langmuir ◽  
1993 ◽  
Vol 9 (3) ◽  
pp. 708-715 ◽  
Author(s):  
A. P. Mast ◽  
R. K. Prud'homme ◽  
J. E. Glass
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Associative Polymers ◽  
Surfactant Systems ◽  
Weight Model

The thermodynamic properties of solutions of polystyrene and of low molecular weight model compounds

2007 ◽  
Vol 16 (2) ◽  
pp. 679-691 ◽  
Author(s):  
J. Pouchlý ◽  
J. Biroš ◽  
K. Šlc ◽  
J. Vondrejsová
Keyword(s):  
Molecular Weight ◽  
Thermodynamic Properties ◽  
Low Molecular Weight ◽  
Model Compounds ◽  
Weight Model

The Chemistry of Phenol-Formaldehyde Resin Vulcanization of EPDM: Part I. Evidence for Methylene Crosslinks

1995 ◽  
Vol 68 (5) ◽  
pp. 717-727 ◽  
Author(s):  
Martin van Duin ◽  
Aniko Souphanthong
Keyword(s):  
Molecular Weight ◽  
Phenol Formaldehyde ◽  
Polymer System ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Low Molecular Weight ◽  
Hydroxyl Groups ◽  
Reaction Products ◽  
Cure Reaction ◽  
Weight Model

Abstract The application of phenol-formaldehyde resins as crosslinking agents is increasing in importance due to the good high temperature properties of the corresponding vulcanizate and the use in thermoplastic vulcanizates. With respect to the chemistry of phenol-formaldehyde cure (reaction mechanism and structure of crosslink) there are still problems that have to be resolved. The reaction products of the phenol-formaldehyde resin curing of EPDM, contain 2-ethylidene norbornene (ENB) as the third monomer, have been studied. Since such an investigation is rather difficult to perform for the polymer system, a low molecular weight model for EPDM was used: 2-ethylidene norbornane (ENBH). Reaction of ENBH and a resole results in scission of the dimethylene ether bridges, i.e. in degradation of the resole into mono-, bis- and terisooctylphenol units. These are consequently converted into products, consisting of two ENBH molecules linked by mono-, bis- and terisooctylphenol units. The solid resole seems to be a technological solution for storing phenol in combination with formaldehyde. These results support the use of 2-hydroxymethylphenol (HMP) as a low molecular weight model for the resole. At low temperatures and/or short reaction times HMP oligomers (= resoles) and HMP oligomers linked to one ENBH molecule are formed, which are converted into ENBH/HMP (1:1) condensation products. The reaction products of ENBH with both the resole and HMP are shown to contain methylene linked structures, as demonstrated by the formation of monisooctylphenol crosslinks and the presence of residual unsaturation and hydroxyl groups, besides chroman linked structures. This is the first experimental evidence that during phenol-formaldehyde resin cure of rubber, formation of methylene bridges occurs.

Ionic interactions and transport in a low-molecular-weight model polymer electrolyte

1998 ◽  
Vol 108 (17) ◽  
pp. 7426-7433 ◽  
Author(s):  
Anders Ferry ◽  
Greger Orädd ◽  
Per Jacobsson
Keyword(s):  
Molecular Weight ◽  
Polymer Electrolyte ◽  
Ionic Interactions ◽  
Low Molecular Weight ◽  
Weight Model

Molecular structures of some low molecular weight model compounds with conformational features similar to those of high molecular weight compounds

1967 ◽  
Vol 16 (5) ◽  
pp. 2877-2880 ◽  
Author(s):  
P. Corradini ◽  
P. Ganis ◽  
C. Pedone ◽  
A. Sirigu ◽  
P. A. Temussi
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Structures ◽  
Low Molecular Weight ◽  
Model Compounds ◽  
Weight Model

A study of the structure-mesomorphism relationship in some polymers and low-molecular-weight model compounds

1990 ◽  
Vol 26 (11) ◽  
pp. 1259-1265 ◽  
Author(s):  
Joaquin Barbera ◽  
Enrique Melendez ◽  
Fernando Navarro ◽  
Jose L. Serrano
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Model Compounds ◽  
Weight Model

scholarly journals Thermotropic Main Chain Polyesters with Polymethylene Spacers and Their Low Molecular Weight Model Compounds—Odd-Even Effect of Polymethylene Spacers

1986 ◽  
Vol 18 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Jung-Il Jin ◽  
E-Joon Choi ◽  
Seog-Cheol Ryu ◽  
Robert W Lenz
Keyword(s):  
Molecular Weight ◽  
Main Chain ◽  
Low Molecular Weight ◽  
Model Compounds ◽  
Weight Model

Programmed release of a low-molecular-weight model substance from multilayer pva-based structures

1999 ◽  
Vol 33 (9) ◽  
pp. 484-486
Author(s):  
V. S. Markin ◽  
A. L. Iordanskii ◽  
R. Yu. Kosenko
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Model Substance ◽  
Weight Model ◽  
Programmed Release
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