Isothermal Crystallization Kinetics of Polypropylene and Hyperbranched Polyester Blends

Fan, Qing; Duan, Fei Hong; Guo, Huai Bing; Wu, Tian Shung

doi:10.4028/www.scientific.net/amr.396-398.1688

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…At last, the activation energy (ÁE) describing the nonisothermal crystallization process is calculated as a function of the relative crystallinity based on Kissinger method. [28][29] Experimental Materials PP (H100EY, weight-average molecular weight ¼ 180,000 g mol À1 ) was obtained from the Reliance Industries Ltd (Jamnagar, Gujarat, India). Virgin PP was in the form of pellets with a melt flow index (MFI) of 11 g/10 min at the rate of 230 C/2.16 kg and a density of 0.9 g cm À3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of nanoclay on the nucleation, crystallization and melting behaviour of polypropylene

Sahoo

Mohanty

Nayak

2016

Journal of Thermoplastic Composite Materials

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Non-isothermal crystallization kinetics of virgin polypropylene (PP) and its nanocomposites have been evaluated using differential scanning calorimetric technique. The nanocomposites were prepared using melt intercalation method. It is observed that the crystallization peak temperature of nanocomposite is marginally higher than virgin PP at various cooling rates. The non-isothermal crystallization melt data were analysed using Avrami, Ozawa and Mos models. The half-time for crystallization decreased with incorporation of clay nanoparticles. The values of crystallization rate constant and cooling rate at unit crystallization time showed that the crystallization rate increased with the increasing of cooling rates for virgin PP and nanocomposite, but the crystallization rate of nanocomposite was faster than that of PP at a given cooling rate. The activation energy for non-isothermal crystallization of virgin polymer and nanocomposites based on Kissinger method has been determined to be 186 and 196 kJ mol−1, respectively. The polarized micrographs showed that the number of effective nuclei increased in the PP-clay nanocomposite, where the clay acts as a heterogeneous nucleating agent during the crystallization of the nanocomposite.

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Section: Introductionmentioning

confidence: 99%

Effect of nanoclay on the nucleation, crystallization and melting behaviour of polypropylene

Sahoo

Mohanty

Nayak

2016

Journal of Thermoplastic Composite Materials

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“…[22][23][24][25] In particular, temperature cycling is considered to be a unique and important strategy for controlling the characteristics of crystal quality during crystallization. Temperature cycling during the engineering process has attracted a great deal of attention in polymer solidification and synthesis, [26][27][28] phase behavior of polymers, 29,30 stability and heat transfer of Taylor vortex flow, 31 catalytic processes, 32 and so on. In solution state crystallization (such as cooling and evaporation crystallization), temperature cycling originated from the fines removal technique for CSD control during a continuous crystallization process, which was proposed by Saeman in 1956.…”

Section: Introductionmentioning

confidence: 99%

Application of temperature cycling for crystal quality control during crystallization

Yang

2016

CrystEngComm

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Characteristics of crystal quality, including crystal size distribution, size, morphology, polymorphism and chirality, have been established as important indicators of crystalline materials. There have been many attempts at controlling crystal quality during crystallization. Herein, this study summarizes crystal quality control by using temperature cycling during solution state crystallization. During crystallization, the temperature cycling is implemented through successive heating-cooling cycles for dissolution and recrystallization in crystal suspension. Therefore, the fines crystals or one species are expected to dissolve out completely during the heating period, and the remaining crystals or dominant species continuously grow or nucleate during the cooling period. When such temperature cycling is facilitated during crystallization, the characteristics of crystal quality, including crystal size distribution, size, morphology, polymorphism and chirality, are well managed. Furthermore, based on the basic principle of temperature cycling, the key parameters for controlling each characteristic of crystal quality are clearly elucidated during the process. Thus, this review provides qualitative insight into the general operation strategies and the principle of temperature cycling for crystal quality control during crystallization.

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Isothermal Crystallization Kinetics of Polypropylene and Hyperbranched Polyester Blends

Cited by 2 publications

References 6 publications

Effect of nanoclay on the nucleation, crystallization and melting behaviour of polypropylene

Effect of nanoclay on the nucleation, crystallization and melting behaviour of polypropylene

Application of temperature cycling for crystal quality control during crystallization

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