Thermal oxidation aging of polydicyclopentadiene and composites

Hu, Yinghui; Zhang, Yunpeng; Nutt, Steven

doi:10.1002/pc.24125

Cited by 15 publications

(14 citation statements)

References 35 publications

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“…The concentrations of carbonyls generated by oxidation were calculated using the Beer-Lambert equation with a molar absorptivity of 300 mol l À1 cm À1 [4] at 1710 cm À1 . The double bond concentration methods will be detailed later.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

“…The final kinetic model appears to be suitable at least in the domain of moderate degrees of conversion and allows the extent of PDCPD degradation to be predicted with time, temperature and external oxygen pressure as input parameters. The case of stabilized PDCPD should now be addressed to get closer to practical cases [4,5,6,29].…”

Section: T( C)mentioning

confidence: 99%

“…Many authors have emphasized the effects of thermal oxidation [4] and crosslinking [5] on physical and mechanical properties through experiments (e.g. T g , rubbery modulus, tensile properties).…”

Section: Introductionmentioning

confidence: 99%

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Thermal oxidation of Poly(dicyclopentadiene)– kinetic modeling of double bond consumption

Huang

David

Gac

et al. 2019

Polymer Degradation and Stability

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This paper reports chemical changes that occur in polydicyclopentadiene during thermal oxidation at several temperatures and oxygen pressures. A particular attention was paid to the double bond consumption since these latter are associated with crosslinking and subsequent changes in mechanical properties. A kinetic model was derived from the experimental results. Its rate constants were assessed from the "inverse approach" based on their selective identification under specific ageing conditions (for example under oxygen excess). The resulting model satisfactorily describes both carbonyl formation and double bond consumption for a wide range of temperature and oxygen pressure for the first time. This can be exploited to predict the changes of local mechanical properties.

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Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Section: T( C)mentioning

confidence: 99%

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Thermal oxidation of Poly(dicyclopentadiene)– kinetic modeling of double bond consumption

Huang

David

Gac

et al. 2019

Polymer Degradation and Stability

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“…This reaction leads to the formation of a new chemical bond and so an increase in the crosslink density of the polymer. Finally, based on literature, it appears that oxidation leads to large changes in mechanical behavior [1,11]. However, all these tests were performed on thick samples, i.e.…”

Section: Introductionmentioning

confidence: 99%

Impact of thermal oxidation on mechanical behavior of polydicylopentadiene: Case of non-diffusion limited oxidation

David

Huang

Richaud

et al. 2020

Polymer Degradation and Stability

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Impact of thermal oxidation on mechanical behavior of polydicyclopentadiene (pDCPD) is studied in this paper. Thermal oxidation is performed over a wide range of ageing temperature, from 20 C to 120 C using 60 mm thin films in order to avoid heterogeneous degradation through sample thickness. After several ageing durations, chemical changes were monitored using Fourier-transform infrared spectroscopy (FTIR) and network modification (e.g. glass transition, Tg) was measured using dynamic mechanical analysis (DMA). In addition, tensile tests and fracture tests, based on the essential work of fracture (EWF) concept, were used to study how oxidation affects some mechanical properties of pDCPD. During oxidation polydicyclopentadiene undergoes crosslinking due to the presence of double bonds that leads to a large increase in T g (from 150 to 225 C) as well as an increase in rubbery modulus. This increase in T g results in an increase in maximal stress that can be described using the Kambour relationship. In parallel, an embrittlement of the polymer is observed here with a decrease in both essential and non-essential work of fracture. Finally, it appears that the accelerating effect of ageing temperature can be described using an Arrhenius equation with an activation energy close to 65 kJ/mol for carbonyl formation, maximal stress changes and decrease in fracture energy.

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“…Organic-inorganic hybrid films represent a class of new advanced materials that combine the flexibility and processability of organic polymers with superior mechanical and thermal stability of inorganic phase. Much research was reported on the fabrication of PEEK nanocomposites by using low-cost conventional techniques such as extrusion and compression molding [17][18][19][20]. To produce composites exhibiting improved properties, different strategies were used to achieve a good dispersion of nanofiller within the polymer matrix, such as ultrasonication, ball milling, wrapping in compatibilizing agents, polymer functionalization, and covalent grafting.…”

Section: Introductionmentioning

confidence: 99%

Thermal, Electrical, and Gas Transport Properties of New Aromatic Poly(Ether Ether Ketone)/Silica Hybrid Films

Hamciuc¹,

Hamciuc²,

Rusu³

et al. 2017

Polymer Composites

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New hybrid films were prepared through a sol–gel process starting from a poly(ether ether ketone)‐containing pendant carboxyl groups (PEEK‐R) and various alkoxysilanes (tetraethoxysilane, methyltrietoxysilane, and phenyltriethoxysilane) as precursors of the inorganic network. PEEK‐R was synthesized from 4,4′‐difluorobenzophenone and a mixture of phenolphthalein and phenolphthalin. Owing to the presence of polar phthalide and carboxyl groups in the PEEK‐R structure, the hybrid films showed homogeneous morphologies. The films exhibited good thermal stability, having initial decomposition temperature over 440°C and a glass transition of 180–218°C. The contact angle values of film surfaces with water and ethylene glycol increased by the introduction of silica. The dielectric spectroscopy analysis at lower temperature evidenced two secondary relaxation processes, γ and β. At higher temperature, a conductivity relaxation was observed. The thermal activation energy of conductivity was in the range of 0.6–1.02 eV, confirming the electronic conduction via hopping. Gas permeation tests using small molecules (He, N2, O2, and CO2) indicated that hybrid films showed higher permeability than pure polymer film for all tested gases. The permeability increase was accompanied by a slight reduction in selectivity, but CO2/N2 selectivity remained significantly high making this type of hybrid materials promising candidate for gas separation membranes. POLYM. COMPOS., 39:E1544–E1553, 2018. © 2017 Society of Plastics Engineers

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Thermal oxidation aging of polydicyclopentadiene and composites

Cited by 15 publications

References 35 publications

Thermal oxidation of Poly(dicyclopentadiene)– kinetic modeling of double bond consumption

Thermal oxidation of Poly(dicyclopentadiene)– kinetic modeling of double bond consumption

Impact of thermal oxidation on mechanical behavior of polydicylopentadiene: Case of non-diffusion limited oxidation

Thermal, Electrical, and Gas Transport Properties of New Aromatic Poly(Ether Ether Ketone)/Silica Hybrid Films

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