The glass transition temperature of filled polymers and its effect on their physical properties

Droste, D. H.; Dibeneditto, A.T.

doi:10.1016/0010-4361(70)90055-8

Cited by 4 publications

(5 citation statements)

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“…crystallization occurred at higher temperature. For glass transition, it was also shown in filled system that polymer modification at the matrix-filler interface caused free volume and chain mobility decrease resulting in glass transition temperature increase (Droste and Dibenedetto, 1969). It was seen on mechanical properties that interface interactions between the PLA and the natural fibres were weak.…”

Section: Thermal and Thermo-mechanical Propertiesmentioning

confidence: 99%

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Gamon

Evon

Rigal

2013

Industrial Crops and Products

118

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. b s t r a c tNatural fibres from miscanthus and bamboo were added to poly(lactic acid) by twin-screw extrusion. The influence of extruder screw speed and of total feeding rate was studied first on fibre morphology and then on mechanical and thermal properties of injected biocomposites. Increasing the screw speed from 100 to 300 rpm such as increasing the feeding rate in the same time up to 40 kg/h helped to preserve fibre length. Indeed, if shear rate was increased with higher screw speeds, residence time in the extruder and blend viscosity were reduced. However, such conditions doubled electrical energy spent by produced matter weight without significant effect on material properties. The comparison of four bamboo grades with various fibre sizes enlightened that fibre breakages were more consequent when longer fibres were added in the extruder. Longer fibres were beneficial for material mechanical properties by increasing flexural strength, while short fibres restrained material deformation under heat by promoting crystallinity and hindering more chain mobility.

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Section: Thermal and Thermo-mechanical Propertiesmentioning

confidence: 99%

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Gamon

Evon

Rigal

2013

Industrial Crops and Products

118

View full text Add to dashboard Cite

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“…So a maximum shift of 30 °C in T g occurs with 20 wt % graphene loading. Increase in the graphene content reduces the value of tan δ as graphene sheets restrict the molecular motion of polymer chains at the interphase . The broadening of tan δ peaks along with the increase in T g points to reduced segmental relaxation .…”

Section: Resultsmentioning

confidence: 99%

Highly filled multilayer thermoplastic/graphene conducting composite structures with high strength and thermal stability for electromagnetic interference shielding applications

Joseph

Koroth

John

et al. 2019

J of Applied Polymer Sci

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Polyvinyl chloride (PVC)/graphene and poly(methyl methacrylate) (PMMA)/graphene nanocomposites were made by solution casting technique with graphene weight fractions of 1, 5, 10, 15, and 20%. Multilayer structures of the composites were made by hot compression technique to study their electromagnetic interference shielding effectiveness (EMI SE). Tensile strength, hardness, and storage modulus of the nanocomposites were studied in relation with graphene weight fraction. There has been a substantial increase in the electrical conductivity and EMI SE of the composites with 15-20% filler loading. Differential thermal analysis of the composites shows improved thermal stability with an increase in graphene loading. PMMA/graphene composites have better thermal stability, whereas PVC/graphene composites have superior mechanical properties. About 2 mm thick multilayer structures of PMMA/graphene and PVC/graphene composites show a maximum EMI SE of 21 dB and 31 dB, respectively, in the X band at 20 wt % graphene loading. Figure 6. SEM images of the tensile fractured surface of (a) PMMA/20 wt % graphene composite, (b) PVC/20 wt % graphene composite, (c) ultimate tensile strength of polymer/graphene composites, (d) Young's modulus of polymer/graphene composites. [Color figure can be viewed at wileyonlinelibrary.com] ARTICLE WILEYONLINELIBRARY.COM/APP

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“…plasticization) because a better interface means that more energy is required for the polymer chains to move, with and without the presence of water. 50…”

Section: Resultsmentioning

confidence: 99%

Effect of modified graphene oxide on the mechanical, thermal, and barrier properties of vinylester

Gauvin

Cousin

Robert

2018

Journal of Composite Materials

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Graphene, which is a one atom thick layer of graphite, has been considerably studied in the past decade due to its extraordinary physical properties. The development of new routes of synthesis facilitates the use of graphene in polymer nanocomposite. The addition of very small amounts (<1%) of graphene in a polymer matrix does not only increase its thermal and mechanical properties, but it would also enhance permeability, by limiting the diffusion of water through the material. Graphene-polymer nanocomposite would be an interesting alternative to conventional polymer nanocomposite such as nanoclay-polymer nanocomposite. In this study, graphene oxide is synthesized from graphite flakes, following the Tour method, and modified with silane to improve its compatibility with the polymer. Polymer nanocomposite made from vinylester resin and 0.5 wt% graphene oxide is prepared as well as other types of typically used polymer nanocomposite such as graphite flake, silica fume or nanoclay based composite. Samples are soaked in a water bath to study the water absorption of these nanocomposites. Mechanical property measurements and thermal analyses are performed to evaluate the benefit of using graphene oxide. Results show a significant enhancement of the mechanical and thermal properties with a graphene oxide content ten times lower than the one needed with conventional nanoparticles. Moreover, unlike nanoclay-based polymer nanocomposite, graphene oxide does not increase water absorption at saturation.

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The glass transition temperature of filled polymers and its effect on their physical properties

Cited by 4 publications

References 0 publications

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Twin-screw extrusion impact on natural fibre morphology and material properties in poly(lactic acid) based biocomposites

Highly filled multilayer thermoplastic/graphene conducting composite structures with high strength and thermal stability for electromagnetic interference shielding applications

Effect of modified graphene oxide on the mechanical, thermal, and barrier properties of vinylester

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