Formation of β-crystal from nonisothermal crystallization of compression-molded isotactic polypropylene melt

Shangguan, Yonggang; Song, Yihu; Peng, Mao; Li, Bingpeng; Zheng, Qiang

doi:10.1016/j.eurpolymj.2005.02.033

Cited by 68 publications

(44 citation statements)

References 26 publications

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“…The degree of crystallinity, X c , is expressed in mass fraction of the crystalline phase, and can be determined from the WAXD patterns based on the ratio of the integrated intensities under the crystalline peaks A c to the integrated total intensities, A = A c + A a in which A a , is the integrated intensities under the amorphous halo [29]:…”

Section: Wide-angle X-ray Diffraction Analysismentioning

confidence: 99%

RETRACTED: Functional polymers synthesized by grafting of glycidyl methacrylate onto swift heavy ions irradiated BOPP films using chemical initiator

Chawla¹,

Ghosh²,

Avasthi

et al. 2009

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Wide-angle X-ray Diffraction Analysismentioning

confidence: 99%

RETRACTED: Functional polymers synthesized by grafting of glycidyl methacrylate onto swift heavy ions irradiated BOPP films using chemical initiator

Chawla¹,

Ghosh²,

Avasthi

et al. 2009

Nuclear Instruments and Methods in Physics Research Section B:

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“…The over loaded filler particles may aggregate in EOC matrix and the aggregated MCA-FA have lower nucleating ability due to the reduced specific surface area. Further, a weak endothermic peak at about 45 • C is observed for all the samples, which can be attributed to a secondary, less organized, crystal phase [46,47].…”

Section: Siliconmentioning

confidence: 91%

Nanostructured Fly Ash as Reinforcement in a Plastomer-Based Composite: A New Strategy in Value Addition to Thermal Power Station Fly Ash

Patil

Mahendran

Anandhan

2014

Silicon

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Class-F fly ash (FA) from a coal-fired thermal power station was subjected to high energy ball millinginduced mechanochemical activation aided by a surfactant. Subsequently, ethylene-octene copolymer/mechanochemically activated FA (EOC/MCA-FA) composites were prepared by solution casting. The surface modification of FA was confirmed from contact angle measurements and FTIR spectroscopy, which accounts for a good interaction between MCA-FA and the polymer matrix. X-ray diffraction reveals that the crystalline size of quartz phase present in FA got reduced, while the relative lattice strain on it increased during milling. Morphological studies revealed that interfacial adhesion between the polymer and MCA-FA is good and this accounts for the improvement in mechanical properties of the composites even at the minimum filler loading. Flame retardance of the matrix polymer is improved by the addition of either fresh FA or MCA-FA. The results imply that FA is a valuable reinforcing filler for ethylene-octene copolymer and its mechanochemical activation is an effective strategy for its future use.

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“…For pure iPP, the intense reflection peaks at 2θ = 14.1 • , 16.8 • , 18.6 • , 21.0 • , and 21.8 • corresponding respectively to the (110), (040), (130), (111), and (131) reflections of the α-crystals of iPP, and a extremely weak reflection peak at 2θ = 16.0 • corresponding to the (300) reflection of the β-crystals of iPP [26] were observed, indicating that α-crystals were the dominant crystalline phase in pure iPP. [30] However, for all nanocomposites, the reflection peak of β-crystals was clearly observed and, with increasing the Ag loading, the β-crystal reflection peak became increasingly intense accompanied by the increasingly weakening of the α-crystal reflection peaks, showing that β-crystals gradually became the dominant phase. This was in good agreement with the previous DSC results.…”

Section: Effect Of Ag Loading On the Crystallization And Melting Behamentioning

confidence: 96%

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Shi

Sun

Zhu

et al. 2012

Journal of Macromolecular Science, Part B

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Differential scanning calorimetry, x-ray diffraction, and polarized optical microscopy were used to investigate the quiescent crystallization and melting behavior of isotactic polypropylene (iPP) nanocomposites based on synthetic organic-soluble Ag nanocrystals (NCs). The effects of Ag loading and crystallization temperature on the crystallization behavior and crystalline structure were studied. The results showed that the synthetic Ag NCs as a novel effective β-crystal nucleating agent for iPP could promote the overall crystallinity, decrease the size of spherulites, and induce the formation of large amounts of β-crystals in the nanocomposites under quiescent crystallization. The relative content of β-crystals significantly increased with increasing Ag loading, and slightly increased with decreasing crystallization temperature. The quiescent crystallization kinetics was analyzed using the Avrami model. The results showed that the iPP nanocomposites with added Ag NCs had higher crystallization rate constant (k) and lower crystallization half-times (t 1/2 ) as well as the Avrami exponent (n) than pure iPP, indicating that the presence of Ag NCs acted as heterogeneous nucleating sites and promoted the crystallization rate of iPP.

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Formation of β-crystal from nonisothermal crystallization of compression-molded isotactic polypropylene melt

Cited by 68 publications

References 26 publications

RETRACTED: Functional polymers synthesized by grafting of glycidyl methacrylate onto swift heavy ions irradiated BOPP films using chemical initiator

RETRACTED: Functional polymers synthesized by grafting of glycidyl methacrylate onto swift heavy ions irradiated BOPP films using chemical initiator

Nanostructured Fly Ash as Reinforcement in a Plastomer-Based Composite: A New Strategy in Value Addition to Thermal Power Station Fly Ash

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

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