Polyepoxide–water interactions: Influence of the chemical structure of the network

Zinck, Philippe; Gérard, Jean‐François

doi:10.1016/j.polymdegradstab.2007.11.013

Cited by 11 publications

(14 citation statements)

References 50 publications

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“…If the epoxyde-amine/glass fiber interphase does not undergo any additional degradation, we attribute the gradual loss in energy release rate observed at longer times for anhydride based microcomposites to a chemical degradation of the interphase, as proposed in the literature, and keeping in mind that both polyepoxide networks do not undergo any chemical degradation in the same experimental conditions [34]. The hydrolysis of specific functional groups formed in epoxyde-anhydride/glass fiber interphase may be advanced, as detailed hereafter.…”

Section: Interphase Thermo-hydrolytic Resistance and Mechanisms Of Dementioning

confidence: 86%

“…Hydrolysis could indeed not be detected on bulk samples [34], and the stability of the glass transition temperature of the films between 24 h and 48 h acts also for the absence of chemical degradation of the films. We further use polymer-diluents laws to evaluate the quantity of water which would have been absorbed by the films under the assumption that chain scission does not occur.…”

Section: Water Induced Plasticization: Microscopic Vs Macroscopic Bementioning

confidence: 95%

“…We measured in this frame the glass transition temperatures of the model films after a thermo-hydrolytic treatment in the same experimental conditions as those used for the exposure of microdroplets (Section 3.2). The glass transition temperature of macroscopic specimens at the initial state and at equilibrium after 30h 1/2 in distillated water at 60°C [34] are also represented Fig. 2 for convenience.…”

Section: Water Induced Plasticization: Microscopic Vs Macroscopic Bementioning

confidence: 99%

“…The initial loss in fracture energy is attributed to the release of internal stresses together with the plasticization of the matrix, while long term degradations are attributed to a chemical degradation of interfacial zones. Concerning time scales, the time required to reach saturation for a microdroplet at 60°C and 98% RH can be roughly estimated using the diffusivities determined for the bulk matrices a the same temperature [34]. This leads to a value of a few minutes.…”

Section: Water Induced Plasticization: Microscopic Vs Macroscopic Bementioning

confidence: 99%

“…Anhydride based polyepoxide networks are valuable starting materials for use in water environment, as they exhibit smaller water uptake and weaker interactions of specific functional groups with water molecules as compared to epoxyde-aromatic amine networks [34]. Their use as matrices for high performance composites materials is thus promising.…”

Section: Design Of Thermo-hydrolytic Resistant Interphase and Composimentioning

confidence: 99%

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Thermo-hydrolytic resistance of polyepoxide–glass fibres interfaces by the microbond test

Zinck

Gérard

2008

Composites Science and Technology

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Section: Interphase Thermo-hydrolytic Resistance and Mechanisms Of Dementioning

confidence: 86%

Section: Water Induced Plasticization: Microscopic Vs Macroscopic Bementioning

confidence: 95%

Section: Water Induced Plasticization: Microscopic Vs Macroscopic Bementioning

confidence: 99%

Section: Water Induced Plasticization: Microscopic Vs Macroscopic Bementioning

confidence: 99%

Section: Design Of Thermo-hydrolytic Resistant Interphase and Composimentioning

confidence: 99%

See 3 more Smart Citations

Thermo-hydrolytic resistance of polyepoxide–glass fibres interfaces by the microbond test

Zinck

Gérard

2008

Composites Science and Technology

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A dielectric study of water uptake in epoxy resin systems

Garden¹,

Pethrick²

2017

J of Applied Polymer Sci

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The influence of epoxy resin formulation on the nature and extent of moisture is studied using dielectric and gravimetric analysis for samples cured at 40, 50, 60, and 70 8C and aged at 50 8C and 70 8C. The equilibrium moisture uptake depends on the difference between the glass transition and aging temperature. Dielectric relaxation data measured from 1 to 3 3 10 10 Hz indicates the presence of water in at least two different environments. The high frequency relaxation ca. 1 3 10 10 Hz is associated with water clustered in nano-voids, whereas the relaxation at 10 5 Hz arises from a combination of OH pendant group reorientation motion coupled with that of molecularly dispersed water molecules. A correlation exist between the dielectric permittivity and the amount of moisture absorbed. Water initially resident in voids is re-dispersed with aging into the resin matrix aiding plasticization and allowing densification of the matrix. The extent to which changes occur depends on the chemical functions forming the matrix and densification leads to a drop in the amount of water absorbed. In the complex resin systems, water interacts with both OH groups and polyether of the amine curing agent which is not possible with the aliphatic diamine in the simple system.] V C 2017 Wiley Periodicals, Inc. J. Appl. Polym.Sci. 2017, 134, 44717.

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Kinetic and reactivity distribution behaviors during curing process of carbon/epoxy composite with thermoplastic interface coatings (T800/3900‐2 prepreg) under the nonisothermal conditions

Janković

2016

Polymer Composites

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In this work, the thermal stability, the non-isothermal cure kinetics and distributed reactivity model (DRM) for fiber reinforced resin matrix composite (T800H/ 3900-2 prepreg) have been systematically analyzed using combined phenomenological and partially fundamental approaches. It has been shown that the proposed actual kinetic model (expressed through the three-parameter Sest ak-Berggren (SB) model including the diffusion effects) more accurately describes the curing process than the idealized kinetic model (which includes only the autocatalytic reaction). Presence of diffusion phenomena that occur at elevated temperatures and higher values of the extent of cures were demonstrated and explained in detail, through the use of modified Williams-Landel-Ferry (WLF) equation (based on the glass transition analysis) and the Avrami crystallization theory. The DRM was demonstrated that in autocatalytic stage, the reaction of primary amine with two epoxy groups plays an important role in the overall curing process. It has been shown that condensed phase effects can lower the apparent activation energy (E a ) value of the curing process. The lifetime analysis showed that the studied T800H/3900-2 prepreg possesses good thermal resistance, which is connected with the process including a ring-opening addition-type crosslinking reaction.POLYM. COMPOS.,

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Polyepoxide–water interactions: Influence of the chemical structure of the network

Cited by 11 publications

References 50 publications

Thermo-hydrolytic resistance of polyepoxide–glass fibres interfaces by the microbond test

Thermo-hydrolytic resistance of polyepoxide–glass fibres interfaces by the microbond test

A dielectric study of water uptake in epoxy resin systems

Kinetic and reactivity distribution behaviors during curing process of carbon/epoxy composite with thermoplastic interface coatings (T800/3900‐2 prepreg) under the nonisothermal conditions

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