Stress-Strain Behaviour, Microhardness, and Dynamic Mechanical Properties of a Series of Ethylene-Norbornene Copolymers

Scrivani, Teresa; Benavente, Rosario; Pérez, Ernesto; Pereña, José M.

doi:10.1002/1521-3935(20010801)202:12<2547::aid-macp2547>3.0.co;2-x

Cited by 56 publications

(57 citation statements)

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“…The parentheses involve the temperature ranges for which activation energies were derived. The obtained values are in good agreement with those derived by Poulsen et al studies of oxygen diffusion [8] and by Scrivani et al from dynamic-mechanical thermal analysis (DMTA) measurements [19].…”

Section: Table Isupporting

confidence: 90%

Molecular Dynamics in Cyclic Olefin Copolymer

et al. 2005

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Nuclear magnetic resonance, broadband dielectric spectroscopy and dynamic-mechanical thermal analysis were employed to study molecular dynamics of ethylene-norbornene copolymer. The analysis of experimental data indicates existence of three motional processes denoted as α, β, and γ in order of decreasing temperature. The α relaxation is related to the dynamic glass transition, while the β relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. The γ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible for γ relaxation in polyethylene. The rate of motion accountable for γ process, follows the Vogel-Fulcher-Tammann equation, similarly to α transition, indicating cooperative nature of the motion.

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Section: Table Isupporting

confidence: 90%

Molecular Dynamics in Cyclic Olefin Copolymer

et al. 2005

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“…Most of these reports correlated the composition, microstructure, and thermal properties of ethene-norbornene copolymer [4][5][6][7][8]. A few studies have been made on the influence of chemical structure on the thermal properties of cyclic olefin copolymers.…”

Section: Introductionmentioning

confidence: 99%

Chemical structure and physical properties of cyclic olefin copolymers (IUPAC Technical Report)

Shin

Park

Liu

et al. 2005

Pure and Applied Chemistry

153

101

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without theAbstract: Cyclic olefin copolymers comprise a new class of polymeric materials showing properties of high glass-transition temperature, optical clarity, low shrinkage, low moisture absorption, and low birefringence. There are several types of cyclic olefin copolymers based on different types of cyclic monomers and polymerization methods. In this work, we have analyzed the chemical structure of the currently commercialized cyclic olefin copolymers by 13 C NMR, and investigated their glass-transition temperatures and surface characteristics. It was observed that the glass-transition temperature, T g , of cyclic olefin copolymers depended on the bulkiness of the main chain, and the number of rings had an important role in increasing the bulkiness of cyclic olefin copolymers. Cyclic olefin copolymers with polar substituents such as ester or ether groups showed high surface energy per area and peel strength.

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“…Wilson et al [85], Forsyth et al [80,86] and Scrivani et al [87] worked on laboratory-made ENCs, whereas Makrocka et al [88,89] worked essentially on Topas COC (8007 and 6013). They all indicated by means of dynamic mechanical thermal analysis (DMTA) and DSC the presence of 3 motional processes related to dynamic glass transition assigned to the different segments of the ENCs.…”

Section: Cyclic Olefin Copolymers (Coc) Development Of Cyclic Olefin mentioning

confidence: 99%

Physico-chemical ageing of ethylene–norbornene copolymers: a review

et al. 2017

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The main object of this report is to review and summarize the current state of the scientific literature relating to physico-chemical ageing of ethylene-norbornene copolymers (ENCs). These processes occur through different means such as photodegradation under the effect of ultraviolet radiation, temperature and ionizing radiation (under air or oxygen). In most cases ageing causes chains scissions that lead to the creation of degradation compounds that exhibit high mobility, corresponding to their low molecular weight and/or high polarity. Cross-linking can also occur, leading to the modification of mechanical properties. The presence of oxygen during ageing is of great importance for the physico-chemical modifications of those polymers in terms of oxidation and thermal stability. ENCs belong to cyclic olefin copolymers (COC) class, whose synthesis was developed in the late 1950s. Nevertheless, commercial applications are relatively new. They attract growing interest in different fields, due to their very useful physical and chemical properties such as transparency, heat and chemical resistance, low permeability to gas as well as biocompatibility. In the literature, a large number of papers deal with the synthesis and characterization of different grades of ENC, but only a few deal with the effects of ageing on these materials. This literature review consists of a summary of the main milestones in the development of COC as well as of cyclic olefin polymers (COP), a review of main techniques for predicting ageing, degradation of additives and interaction between COC/COP and contact environment as well as toxicity of the extractables.

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Stress-Strain Behaviour, Microhardness, and Dynamic Mechanical Properties of a Series of Ethylene-Norbornene Copolymers

Cited by 56 publications

References 10 publications

Molecular Dynamics in Cyclic Olefin Copolymer

Molecular Dynamics in Cyclic Olefin Copolymer

Chemical structure and physical properties of cyclic olefin copolymers (IUPAC Technical Report)

Physico-chemical ageing of ethylene–norbornene copolymers: a review

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