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Title: EPDM polymers with intermolecular asymmetrical molecular weight, crystallinity and diene distribution

Abstract

Rapid extrusion of EPDM elastomers require low viscosity and thus low molecular weights for the polymer. Efficient vulcanization of these elastomers requires network perfection and thus high molecular weights for the polymer. The benefits of these apparently mutually exclusive goals is important in uses of EPDM elastomers which require extrusion of profiles which are later cured. This paper shows that by introducing simultaneously asymmetry in the distribution of molecular weights, crystallinity and vulcanizable sites these apparently contradictory goals can be resolved. While these polymers cannot be made from a single Ziegler polymerization catalyst, the authors show the synthesis of these model EPDM polymers by blending polymers with very different molecular weights, ethylene and ENB contents. These blends can be rapidly extruded without melt fracture and can be cured to vulcanizates which have excellent tensile properties.

Authors:
; ;  [1]
  1. Exxon Chemical Co., Linden, NJ (United States)
Publication Date:
OSTI Identifier:
141948
Report Number(s):
CONF-930304-
TRN: 93:003688-1636
Resource Type:
Conference
Resource Relation:
Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; ETHYLENE PROPYLENE DIENE POLYMERS; EXTRUSION; VULCANIZED ELASTOMERS; STRUCTURAL CHEMICAL ANALYSIS; ZIEGLER CATALYST; CHEMICAL COMPOSITION; MOLECULAR WEIGHT; CRYSTAL STRUCTURE

Citation Formats

Datta, S., Cheremishinoff, N.P., and Kresge, E.N.. EPDM polymers with intermolecular asymmetrical molecular weight, crystallinity and diene distribution. United States: N. p., 1993. Web.
Datta, S., Cheremishinoff, N.P., & Kresge, E.N.. EPDM polymers with intermolecular asymmetrical molecular weight, crystallinity and diene distribution. United States.
Datta, S., Cheremishinoff, N.P., and Kresge, E.N.. Fri . "EPDM polymers with intermolecular asymmetrical molecular weight, crystallinity and diene distribution". United States.
@article{osti_141948,
title = {EPDM polymers with intermolecular asymmetrical molecular weight, crystallinity and diene distribution},
author = {Datta, S. and Cheremishinoff, N.P. and Kresge, E.N.},
abstractNote = {Rapid extrusion of EPDM elastomers require low viscosity and thus low molecular weights for the polymer. Efficient vulcanization of these elastomers requires network perfection and thus high molecular weights for the polymer. The benefits of these apparently mutually exclusive goals is important in uses of EPDM elastomers which require extrusion of profiles which are later cured. This paper shows that by introducing simultaneously asymmetry in the distribution of molecular weights, crystallinity and vulcanizable sites these apparently contradictory goals can be resolved. While these polymers cannot be made from a single Ziegler polymerization catalyst, the authors show the synthesis of these model EPDM polymers by blending polymers with very different molecular weights, ethylene and ENB contents. These blends can be rapidly extruded without melt fracture and can be cured to vulcanizates which have excellent tensile properties.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 31 00:00:00 EST 1993},
month = {Fri Dec 31 00:00:00 EST 1993}
}

Conference:
Other availability
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