Plastic deformation behavior of β-phase isotactic polypropylene in plane-strain compression at room temperature

Łężak, E.; Bartczak, Z.; Gałęski, Andrzej

doi:10.1016/j.polymer.2006.10.016

Cited by 95 publications

(134 citation statements)

References 44 publications

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“…[8][9][10][11][12][13] Pure or nearly pure phase had been obtained by Varga et al,14,15 though phase is meta-stable 16,17 and it may convert into -phase while the specimen is applied with heating treatment or mechanical force. 18,19 As widely acknowledged, the trigonal -phase shows 3 1 helical hand which is the same as -and -phases. 20,21 The assembly of macromolecular chains of iPP towards the given crystalline structure is affected by the crystallographic interaction between iPP and the nucleating agent.…”

mentioning

confidence: 75%

Effect of a Novel Family of N,N′-Diphenyl Bisamides on the Formation of β Crystalline Form in Isotactic Polypropylene

Dou

2009

Polym. J.

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In this paper, a family of eight N,N 0 -diphenyl bisamide compounds were synthesized and characterized by fourier transform infrared (FT-IR) and 1 H nuclear magnetic resonance (NMR) technologies. The influence of different compounds on the formation of crystalline form in iPP had been investigated by means of wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC) and polarized light microscopy (PLM). N,N 0 -diphenyl succinamide (DPS), N,N 0 -diphenyl glutaramide (DPG) and N,N 0 -diphenyl adipamide (DPA) are -nucleating agents for iPP among these compounds. The results also indicate that DPS and DPA have higher ability to induce the -form than DPG. The analysis of the cell parameters of three efficient -nucleating agents shows that they all have approximate periodic length of b-axis of 0.65 nm. And it is also suggested that two-dimensional lattice matching relationships exist between the crystal structures of the -nucleating agents and that of -iPP.

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mentioning

confidence: 75%

Effect of a Novel Family of N,N′-Diphenyl Bisamides on the Formation of β Crystalline Form in Isotactic Polypropylene

Dou

2009

Polym. J.

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“…Notwithstanding, in a very recent work [82], Xu et al proposed a β−α solid state transition operating via crystal slip on the (110) and (120) planes of β crystal lattice. The disordered smectic phase of PP has also been shown to contribute to the strain-induced phase transition process [83,84]. …”

Section: Strain-induced Phase Transitionmentioning

confidence: 99%

Plasticity of semi-crystalline polymers: crystal slip versus melting-recrystallization

Séguéla¹

2007

E-Polymers

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Semi-crystalline polymers can be drawn up to very high draw ratios that involve a complete molecular rearrangement of the chain-folded lamellar morphology into a more or less chain-unfolded fibrillar microstructure. This metamorphosis is likely to take place through an intermediate state of high molecular disorder at a local scale. This is the reason why some authors talk of a strain-induced melting-recrystallization process. In contrast, several structural features occurring at moderate plastic strains are relevant to strictly crystallographic processes. A critical discussion of experimental findings and theoretical approaches is made for pointing out the strength or the deficiency of the different author argumentations. No doubt that both phenomena can occur: crystallographic processes are active at all strain levels whereas meltingrecrystallization is restricted to the post-yield stage accompanied with chain unfolding. Melting-recrystallization is rather a corollary of chain unfolding than a basic mechanism of the plastic deformation. Besides, it may concern only a part of the crystalline phase and can be inhibited under adequate deformation conditions.

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“…The increase of temperature gradient favors the generation of β-crystal during the crystallization process in the temperature field. [15] In the CIM process for iPP, a great amount of α-crystal is produced when the melt contacts the mold wall, and therefore less β-crystal will be formed in the shell. Because the cooling rate of shear layer, away from the surface to a certain extent, is relatively high, the melt temperature can be rapidly reduced to a range of 100 to 140°C to facilitate β-crystal generation, and therefore numerous β-crystals will be produced.…”

Section: Introductionmentioning

confidence: 99%

β‐Crystal formation in isotactic polypropylene due to rapid heat cycle molding

Zhou

et al. 2015

Polymers for Advanced Techs

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Performance of the rapid heat cycle-molded products is highly correlated to its multilayer structure and crystal form in the multilayers. In this study, isotactic polypropylene was introduced in molding experiments, multi-sites sampling was carried out, and β-crystal contents together with multilayer structure were characterized by scanning electron microscopy and X-ray diffraction. It is shown that the distribution of β-crystal is significantly relevant to the multilayer structure. Meanwhile, a higher mold-heating temperature would benefit the formation of β-crystal, the content of which is mainly dependent on mold temperature and filling distance.

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Plastic deformation behavior of β-phase isotactic polypropylene in plane-strain compression at room temperature

Cited by 95 publications

References 44 publications

Effect of a Novel Family of N,N′-Diphenyl Bisamides on the Formation of β Crystalline Form in Isotactic Polypropylene

Effect of a Novel Family of N,N′-Diphenyl Bisamides on the Formation of β Crystalline Form in Isotactic Polypropylene

Plasticity of semi-crystalline polymers: crystal slip versus melting-recrystallization

β‐Crystal formation in isotactic polypropylene due to rapid heat cycle molding

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