Crystallization kinetics of polypropylene with hyperbranched polyurethane acrylate being used as a toughening agent

Xu, Gang; Shi, Wenfang; Hu, Peng; Mo, Songping

doi:10.1016/j.eurpolymj.2005.02.037

Cited by 37 publications

(26 citation statements)

References 19 publications

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“…Organic modification of MMT gives rise to different grades of Cloisites and used in the development of polymer nanocomposites. However, the works reported in the published literature are mostly centered on selection of a particular grade of nanoclay in varied concentration in a nanocomposite to study general characteristics of the crystallization using differential scanning calorimeter (DSC) [10][11][12][13][14][15][16][17][18][19][20]. A more systematic study on the crystallization kinetics of polyurethane containing different grades of nanoclay has yet to be reported.…”

Section: Introductionmentioning

confidence: 98%

Crystallization kinetics of polyurethane nanocomposites

Gupta

Abbas

Sharma

et al. 2014

J Therm Anal Calorim

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Nanocomposites of the segmented polyurethane (SPU) polymer containing different grades of Cloisite Ò nanoclay at 3 mass% loading have been prepared. The morphology of the prepared nanocomposites has been viewed through scanning electron microscope combined with energy dispersive X ray for the confirmation of the nanocomposite formation. Their non-isothermal crystallization kinetics have been investigated by applying modified Avrami and combined Avrami-Ozawa equations at four different cooling rates using a modulated differential scanning calorimeter. The crystallization parameters e.g., peak temperature (T p ), associated enthalpy (DH), etc., have been calculated. It has been observed that the addition of nanoclay into SPU accelerates the rate of nucleation and thereby, growth of crystallization in SPU. The Avrami exponent 'n' has shown two dimensional growth, while the rate constant 'Z c ' indicates an increase in the crystallization rate with increasing rate of cooling. The activation energy of the crystallization process has been calculated using Kissinger method. The glass transition temperature has also been estimated using thermomechanical analyzer, and the nanocomposites show superiority over the neat SPU.

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Section: Introductionmentioning

confidence: 98%

Crystallization kinetics of polyurethane nanocomposites

Gupta

Abbas

Sharma

et al. 2014

J Therm Anal Calorim

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“…Blending of PP with other polymer/fillers is generally used to enhance physical properties. Large number of polymers such as poly(ethylene-propylene rubber), polyisobutylene [28], polystyrene [29], styrene-butadiene elastomer [30], polycarbonate [31], high density polyethylene [32], polyphenylene sulfide [33], hyper branched polyurethane acylate [34], and maleic anhydride grafted polypropylene [35] are used to affect the crystallization process.…”

Section: Introductionmentioning

confidence: 99%

Effects of SEBS-g-MA copolymer on non-isothermal crystallization kinetics of polypropylene

Sharma

Maiti

2014

J Mater Sci

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The non-isothermal crystallization kinetics of pure PP and PP/SEBS-g-MA blends up to volume fraction, U d (0-0.50) was studied by differential scanning calorimetry at four different cooling rates. Crystallization parameters were analyzed by Ozawa and Liu models. The Ozawa model fits in the PP/SEBS-g-MA blends and indicates the effect of SEBS-g-MA copolymer on the crystallization process of polypropylene. Augis-Bennet model has been used to calculate activation energy, DE, during non-isothermal crystallization process. The value of DE decreased with SEBS-g-MA due to flexibility of SEBS-g-MA by which movements of chains of PP become easier.

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“…With the addition of some small particles, the supercooling degree (SD) of water can be greatly reduced [1,2], a finding that might improve the performance of ice storage system. Differential scanning calorimetry (DSC) has been widely used to study properties of materials by probing the thermal behaviours, particularly the phase transition with temperature [3][4][5]. In recent years, it has been applied to the investigation of nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Chen

Jia

et al. 2011

Journal of Experimental Nanoscience

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Aqueous dispersions of Titania nanoparticles were cooled using differential scanning calorimetry (DSC). The nanoparticles reduce the supercooling of water by acceleration of nucleation. The experimental results demonstrated the important role in water crystallisation by the internal surface of the sample holder, and that stable nanofluids are required for the measurements to investigate the effect of nanoparticles on freezing. But for dispersions at low concentrations, such as 0.05 wt% and 0.1 wt%, the starting temperatures of freezing were found to be unusual at the cooling rates of 3 C/min and 4.5 C/min, namely they were even lower than that of the deionised (DI) water. It is found that surface controlled nucleation (SCN) is dominant at low cooling rates, while volumetric controlled nucleation (VCN) is dominant at high cooling rates.

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Crystallization kinetics of polypropylene with hyperbranched polyurethane acrylate being used as a toughening agent

Cited by 37 publications

References 19 publications

Crystallization kinetics of polyurethane nanocomposites

Crystallization kinetics of polyurethane nanocomposites

Effects of SEBS-g-MA copolymer on non-isothermal crystallization kinetics of polypropylene

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

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Crystallization kinetics of polypropylene with hyperbranched polyurethane acrylate being used as a toughening agent

Cited by 37 publications

References 19 publications

Crystallization kinetics of polyurethane nanocomposites

Crystallization kinetics of polyurethane nanocomposites

Effects of SEBS-g-MA copolymer on non-isothermal crystallization kinetics of polypropylene

Reduction of supercooling of water by TiO2 nanoparticles as observed using differential scanning calorimeter

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Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter