Comonomer distribution effect on the ageing behavior of ethylene-propylene random copolymers

2018 ◽  
Author(s):  
Jingbo Wang ◽  
Markus Gahleitner ◽  
Juliane Braun ◽  
Davide Tranchida
Keyword(s):  
Random Copolymers ◽  
Ethylene Propylene ◽  
Distribution Effect

Microstructure of Ethylene/Propylene Random Copolymers Prepared by a Fluorinated Bis(phenoxy-imine)Ti Catalyst

2006 ◽  
Vol 58 (5-6) ◽  
pp. 903-911 ◽  
Author(s):  
Zixiu Du ◽  
Junting Xu ◽  
Xin Wang ◽  
Zhiqiang Fan
Keyword(s):  
Random Copolymers ◽  
Ethylene Propylene

Crystallinity and Mechanical Behavior Evolution in Ethylene−Propylene Random Copolymers

2001 ◽  
Vol 34 (11) ◽  
pp. 3626-3633 ◽  
Author(s):  
Kathryn J. Wright ◽  
Alan J. Lesser
Keyword(s):  
Mechanical Behavior ◽  
Random Copolymers ◽  
Ethylene Propylene

Maleated Ethylene-Propylene Random Copolymers:  Determination of the Microstructure and Association Level by Fluorescence Spectroscopy

2001 ◽  
Vol 105 (21) ◽  
pp. 4827-4839 ◽  
Author(s):  
Veena Vangani ◽  
Jillian Drage ◽  
Junaid Mehta ◽  
Anna K. Mathew ◽  
Jean Duhamel
Keyword(s):  
Fluorescence Spectroscopy ◽  
Random Copolymers ◽  
Ethylene Propylene

scholarly journals THE STRUCTURE CHARACTERIZATION OF ETHYLENE-PROPYLENE RANDOM COPOLYMERS FOR HOT WATER PIPING

2006 ◽  
Vol 006 (1) ◽  
pp. 177-179
Author(s):  
Meifang Guo ◽  
Yuping Dong ◽  
Honghong Huang ◽  
Jingchun Zhang ◽  
Qianshu Li
Keyword(s):  
Hot Water ◽  
Structure Characterization ◽  
Random Copolymers ◽  
Ethylene Propylene ◽  
Water Piping

Ethylene Propylene Terpolymers

1967 ◽  
Vol 40 (2) ◽  
pp. 569-589 ◽  
Author(s):  
R. German ◽  
G. Vaughan ◽  
R. Hank
Keyword(s):  
Molecular Weight ◽  
Raw Materials ◽  
General Purpose ◽  
Random Copolymers ◽  
Technological Properties ◽  
Ethylene Propylene ◽  
The Third ◽  
Low Degrees ◽  
Accelerator System ◽  
Controlled Structures

Abstract The general technological properties of a polymer are closely related to its molecular structure. It is, therefore, important to know polymerization methods by which to produce reproducible polymers with controlled structures. Use of several monomers in copolymerization significantly increases the difficulty of this problem, but in the end it leads to a much wider spectrum of raw materials. In addition to variations caused by changes in molecular weight and in molecular weight distribution the nature of copolymers may be altered by changing the composition of the monomer mixture and the way monomers are distributed in the polymer chain. Use of Ziegler-Natta catalysts has already given a multiplicity of materials composed of ethylene and propylene: random copolymers are particularly interesting as rubbers. Introduction of a third component to give unsaturation in the terpolymer, so that this may be vulcanized with sulfur and accelerators, has greatly increased the possible areas of application for these polymers. Utility of a diene as the third component to give EPT's which can be used as general purpose rubbers depends on its price, the ease with which it copolymerizes through one double bond, its influence on the velocity or steric course of the ethylene-propylene copolymerization, vulcanization characteristics of the resulting terpolymers, and finally on the technological properties of the vulcanizates. The amount of copolymerized termonomer should be limited to retain the advantageous chemical and physical properties of the original ethylene-propylene copolymers. However very low degrees of unsaturation limit the sulfur and accelerator system, the characteristics of which depend strongly on the structure of the terpolymer as well as on the nature and form of the vulcanization agent. It is therefore essential to have a thorough understanding of this multiple interdependency for optimal application of the materials. We describe here reproducible procedures for production of terpolymers with controlled structures, and the course of vulcanization of the products in relation to terpolymer structure. We shall describe methods, based on these investigations, which may be applied for control of the vulcanization characteristics of the polymers.

Synthesis and characterization of ethylene–propylene random copolymers with isotactic propylene sequence

Polymer ◽  
2001 ◽  
Vol 42 (23) ◽  
pp. 9611-9615 ◽  
Author(s):  
Yong-Woo Shin ◽  
Toshiya Uozumi ◽  
Minoru Terano ◽  
Koh-hei Nitta
Keyword(s):  
Random Copolymers ◽  
Synthesis And Characterization ◽  
Ethylene Propylene

Dynamics of Ethylene−Propylene Random Copolymers by1H and13C Solid-State NMR

2011 ◽  
Vol 115 (9) ◽  
pp. 1978-1985 ◽  
Author(s):  
G. Mollica ◽  
C. Forte ◽  
M. Malvaldi ◽  
M. Geppi
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Random Copolymers ◽  
Ethylene Propylene
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