Polyurethane networks based on α,ω-dihydroxytelechelic and on random hydroxyl-functionalized side chain poly(2-chloroethyl vinyl ether)s: Synthesis and investigation of mechanical properties
✍ Scribed by Véronique Bennevault; Gilles Richard; Alain Deffieux
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 667 KB
- Volume
- 198
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
This paper reports on the synthesis and characterization of polyurethane networks based on an α,ω‐dihydroxytelechelic poly(2‐chloroethyl vinyl ether) (PCEVE precursor, type I) and on PCEVE with 2‐hydroxyethyl groups statistically distributed along the chains (PCEVE precursor, type II). The different hydroxyl‐functional polymer precursors were synthesized via “living” cationic polymerization of CEVE to allow the control of molecular weights, molecular weight distributions, as well as, for the dihydroxytelechelic precursor, the chain end functionality. PCEVE precursors of type II were obtained by derivatization of a small fraction of 2‐chloroethyl side groups into 2‐hydroxyethyl groups, using polymer analogous reactions.
The mechanical properties of the corresponding PCEVE‐polyurethane (PU) networks were investigated. Data are analyzed in terms of precursor structure and average chain length between crosslinks. The mechanical properties of the PCEVE‐PU networks are also compared to those of PU networks based on hydroxyl‐terminated polybutadiene (HTPB) prepared according to the same experimental procedure. It was found that the networks based on PCEVE have higher toughness to break and higher elongation properties.