Kinetic analysis of the thermal oxidation of metallocene cyclic olefin copolymer (mCOC)/TiO2 composites by FTIR microscopy and thermogravimetry (TG)

Yang, Thomas C.-K.; Lin, Senshang; Chuang, Tsu-Hwang

doi:10.1016/s0141-3910(02)00225-2

Cited by 44 publications

(23 citation statements)

References 13 publications

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“…Variation in the activation energy for both PLA and PLA-GR nanocomposites with respect to conversion can be noticed all through the thermal degradation process. This reveals that the thermal degradation of both PLA and composites does not proceed through the simple process [50,51]. The activation energy value (177 kJ/mol) obtained for neat PLA is in accordance with the literature data [52].…”

Section: Flynn-wall-ozawa Methodssupporting

confidence: 89%

Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid)

et al. 2015

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In present study, the effect of graphene (GR) on crystallization and thermal degradation kinetic behavior of poly(lactic acid) (PLA) was investigated. The non isothermal cold crystallization kinetic study for PLA-GR nanocomposites was carried out using differential scanning calorimetry at different heating rates of 2.5, 5, 7.5 and 10°C/min. The obtained kinetic data were analyzed using crystallization kinetic models such as Avrami and Tobin methods. The decreasing trend obtained in the Avrami as well as Tobin exponent (n and n T, respectively) with respect to neat PLA revealed the nucleating effect of graphene. Thermal degradation behavior of both PLA and PLA-GR nanocomposites was also analyzed by Kissinger method. The increasing trend in the activation energy with respect to GR loading was observed as compared to neat PLA. This is an indication of improvement in the thermal stability of PLA with an increase in the GR loading. Polarized optical microscopy (POM) was used to observe the growth of spherulites in the PLA and PLA-GR nanocomposites. With respect to addition of GR in the PLA matrix, reduction in the nucleation induction time and an increment in the number of nucleation sites were reflected in the POM analysis.

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Section: Flynn-wall-ozawa Methodssupporting

confidence: 89%

Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid)

et al. 2015

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“…On a previous work [20] we published the high thermal stability of these cycloolefin resins with a decomposition temperature above of 450 ∘ C. The very low CI values and the little difference on the mechanical properties reflected on the percent in elongation at break indicate a good stability to oxidation even under the presence of prodegradant additives at the thermal aging conditions. Similar results on thermal stability of cycloolefins have been reported by Yang and coworkers [21] and an investigation on the role of metal stearates on the degradation behavior of LDPE has been published by Roy and coworkers [22].…”

Section: Tensile Testssupporting

confidence: 84%

A Comparative Study of the Photodegradation of Two Series of Cyclic Olefin Copolymers

Gutiérrez-Villarreal¹,

Zavala-Betancourt²

2017

International Journal of Polymer Science

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A series of commercial cyclic olefin copolymers (COC), namely, ethylene-norbornene (E-NB) and ethylene-tetracyclododecene (E-TD), were processed as thin films with thicknesses of 25 m by an extrusion process. The photodegradation of neat and formulated films with different metal stearates (Fe, Co, and Mn) was investigated using an ultraviolet (UV) light lamp (340 nm) for a period of 30 days in an accelerated weathering tester model QUV from Q-LAB according to the ASTM D 5208-01 standard practice. Changes in carbonyl index (CI) and tensile properties were used to evaluate the photodegradation of the films and other properties, such as variation by DSC, were also analyzed. The present study reveals that (E-NB) copolymers show higher sensitivity to photodegradation than (E-TD) resins, in the absence and presence of metal stearates. We also find that the Fe salt shows the highest oxidative activity.

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“…This type of ageing has been referenced by several authors [91][92][93][94][95][104][105][106]. Thermal ageing is performed to study the thermal stability and the thermal properties of materials.…”

Section: Ageing By Thermal Oxidationmentioning

confidence: 99%

“…Yang et al [106] used FTIR microscopy and thermogravimetry under air atmosphere to study the kinetic behaviour of the thermal oxidation of Topas Ò 5013. In this study, authors mixed TiO 2 powder with ENCs to improve the thermophysical and dielectrics properties of electro-optic devices, and this material was compared with pure metallocene COC (mCOC).…”

Section: Ageing By Thermal Oxidationmentioning

confidence: 99%

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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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Kinetic analysis of the thermal oxidation of metallocene cyclic olefin copolymer (mCOC)/TiO2 composites by FTIR microscopy and thermogravimetry (TG)

Cited by 44 publications

References 13 publications

Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid)

Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid)

A Comparative Study of the Photodegradation of Two Series of Cyclic Olefin Copolymers

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

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