Low molar mass polybutadiene made crosslinkable by the introduction of styrenic moieties via urethane linkage: synthesis, kinetic and crosslinking studies

The introduction of styrenic moieties was chosen for the radical crosslinking of polybutadiene bearing hydroxy functions. The modifications were carried out with 3-isopropenyl-α,α-dimethylbenzyl isocyanate (TMI) with or without catalyst (DBTL). A 2nd order kinetic fits our experimental results up to...

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Bibliographic Details
Published inEuropean polymer journal Vol. 38; no. 10; pp. 1979 - 1986
Main Authors Schapman, Fanny, Couvercelle, Jean-Pierre, Bunel, Claude
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.10.2002
Elsevier
Subjects
Applied sciences
Chemical modifications
Chemical reactions and properties
Crosslinking
Exact sciences and technology
Kinetic
Mechanical properties
Organic polymers
Physicochemistry of polymers
Polybutadiene
Styrenic
Mechanical properties
Styrenic
Crosslinking
Polybutadiene
Kinetic
Organic isocyanate
Butadiene copolymer
Bifunctional compound
Styrene derivative copolymer
Experimental study
Carbamoylation
Crosslinked copolymer
Chemical modification
Free radical polymerization
Dynamic mechanical properties
Butadiene polymer
Preparation
Styrene derivatives
Prepolymer
Kinetics
Chemical reactivity
Butadiene(hydroxy) polymer
Activation energy
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Summary:The introduction of styrenic moieties was chosen for the radical crosslinking of polybutadiene bearing hydroxy functions. The modifications were carried out with 3-isopropenyl-α,α-dimethylbenzyl isocyanate (TMI) with or without catalyst (DBTL). A 2nd order kinetic fits our experimental results up to high conversion. Arrhenius parameters were calculated. Thermally catalyzed crosslinking was studied. The reaction was followed by measuring swelling ( Q) in toluene as well as mechanical parameters (storage modulus E ′ at the rubbery plateau and tan δ). The influence of temperature, the nature and concentration of initiators, the number of styrenic groups per chain ( n=1.2, 2, 2.4) were investigated. In the range of our experimental conditions, a “reaction master curve” was established to predict the evolution of E ′ and Q as a function of time, for any temperature, initiator concentration and value of n.
ISSN:0014-3057
1873-1945
DOI:10.1016/S0014-3057(02)00088-5