Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates

Batista, Natássia Lona; Olivier, Philippe; Bernhart, Gérard; Rezende, Mirabel Cerqueira; Botelho, Edson Cocchieri

doi:10.1590/1980-5373-mr-2015-0453

Cited by 118 publications

(103 citation statements)

References 23 publications

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“…As Table illustrates, with increasing the cooling rate, a drop in X c [Figure (B)], slightly lower melting temperature [Figure (A)], an increase in γ phase proportion compared to α phase one [Figure (A)] and a slight increase in T g (at 15 °C/min) {the middle of peaks was considered as T g [Figure (A′)]} are also obvious. Higher cooling rate leads to less ordered polymer chains as a result of which T m has a downward trend . Higher cooling rate is said to be a motivator for producing more γ phase .…”

Section: Resultsmentioning

confidence: 99%

Calorimetric and rheokinetic analyses merged to capture crystallization kinetics in polyamide/clay nanocomposites: Revisiting predictability of models

Kermaniyan

Garmabi

Saeb

2018

J of Applied Polymer Sci

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Crystallization kinetics of polymer/clay systems was the subject of numerous investigations, but still there are some ambiguities in understanding thermal behavior of such systems under isothermal and nonisothermal circumstances. In this work, isothermal rheokinetic and nonisothermal calorimetric analyses are combined to demonstrate crystallization kinetics of polyamide6/nanoclay (PA6/NC) nanocomposites. As the main outcome of this work, we detected different regimes of crystallization and compared them by both isothermal dynamic rheometry and nonisothermal differential scanning calorimetry (DSC), which has not been simultaneously addressed yet. A novel analysis, somehow different from the common ones, is used to convert the storage modulus data to crystallinity values leading to more reasonable Avrami parameters in isothermal crystallization. It was found based on isothermal rheokinetic studies that increase of NC content and shear rate are responsible for erratic behavior of Avrami exponent and crystallization rates. Optimistically, however, isothermal crystallization by rheometer was confirmed by DSC. Nonisothermal calorimetric evaluations suggested an accelerated crystallization of PA6 upon increasing NC content and cooling rate. The crystallization behavior was quantified applying Ozawa (r2 between 0.070 and 0.975), and combinatorial Avrami–Ozawa (r2 between 0.984 and 0.998) models, where the latter appeared more appropriate for demonstration of nonisothermal crystallization of PA6/NC nanocomposites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46364.

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Section: Resultsmentioning

confidence: 99%

Calorimetric and rheokinetic analyses merged to capture crystallization kinetics in polyamide/clay nanocomposites: Revisiting predictability of models

Kermaniyan

Garmabi

Saeb

2018

J of Applied Polymer Sci

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“…In addition, the percentage crystallinity, calculated from Eqn , slightly increases from 38.5% for neat LDPE to 39.6% for the 1.0 wt% LDPE/rGO nanocomposite. The improvement in the degree of crystallinity of the nanocomposites indicates that rGO also can serve as a nucleation agent in the LDPE matrix to enhance the thermal properties of the LDPE/rGO nanocomposites …”

Section: Resultsmentioning

confidence: 99%

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Toh

Ong

Bindumadhavan

et al. 2018

Polymer International

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The variation in physicochemical properties on incorporation of unmodified reduced graphite oxide (rGO) into a low‐density polyethylene (LDPE) matrix has received much attention. Herein, a simple method is developed for the fabrication of LDPE/rGO nanocomposites using a solvent casting method. The UV‐visible spectra showed that addition of rGO can effectively cut off the short‐wavelength UV‐B light, which resists the occurrence of photoreaction. The stiffness of the LDPE/rGO nanocomposites was improved by 45% with an increase of modulus of elasticity as the rGO content increases. This is slightly opposite to the small decrease of the nanocomposite tensile strength. The addition of rGO to LDPE improved the thermal stability and degree of crystallization of LDPE/rGO nanocomposites when the rGO content increases from 0.025 to 1 wt%. The gas barrier property was also improved by 26% with 0.3 wt% of rGO. The dielectric property of the LDPE/rGO nanocomposites was also evaluated for industrial electronics application and the dielectric constant increases 50% compared with the neat LDPE when 0.1–1 wt% rGO was added. Results obtained clearly indicate the feasibility of using unmodified rGO to improve the properties of LDPE matrix for meeting the performance requirements for intended use in packaging industries. © 2018 Society of Chemical Industry

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“…The Scherrer method was applied to determine the crystallite size ( L ) through the application of the Debye–Scherrer equation (Eq. 1):

L = \frac{Kλ}{β \cos θ}

where λ is the wavelength of the X‐ray diffractometer in nanometers, β is the full‐width at half‐maximum of the main diffraction peak for PHB, arising from the (020) diffraction plane which corresponds to a 2 θ value of 13.8° , and K is a constant related to the crystallite format (in this case, K = 0.9) .…”

Section: Methodsmentioning

confidence: 99%

Study of C─H⋯O Bond of Organic–Inorganic Hybrids Based on Polyhydroxybutyrate and Oxides Obtained Via an In Situ Sol–Gel Route

Toledo

Rodrigues

Filho

et al. 2020

Polymer Engineering & Sci

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Sol–gel‐based zirconia (ZrO2) and silica (SiO2) were obtained in situ via hydrolysis–polycondensation of metal alkoxide precursors in membranes of poly(3‐hydroxybutyrate) (PHB). What followed was an assessment of thermal and spectroscopic effects from the insertion of the inorganic network in the PHB matrix. The findings exhibited a dependence of both the concentration and the chemical nature of the precursor on the properties of the as‐formed inorganic–organic hybrids. The results also indicated that positive nucleating effects, a reduction of the crystallite size and a variation in thermal transitions correlate with spectroscopic data from the alpha and beta crystal forms of the PHB matrix, as well as the crystallization data obtained through polarized light microscopy. POLYM. ENG. SCI., 60:673–681, 2020. © 2020 Society of Plastics Engineers

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Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates

Cited by 118 publications

References 23 publications

Calorimetric and rheokinetic analyses merged to capture crystallization kinetics in polyamide/clay nanocomposites: Revisiting predictability of models

Calorimetric and rheokinetic analyses merged to capture crystallization kinetics in polyamide/clay nanocomposites: Revisiting predictability of models

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Study of C─H⋯O Bond of Organic–Inorganic Hybrids Based on Polyhydroxybutyrate and Oxides Obtained Via an In Situ Sol–Gel Route

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