Crystal orientation of β-phase isotactic polypropylene induced by magnetic orientation of N,N′-dicyclohexyl-2,6-naphthalenedicarboxamide

Kawai, Tadakazu; Iijima, Ryota; Yamamoto, Yūzō; Kimura, Tsunehisa

doi:10.1016/s0032-3861(02)00690-0

Cited by 89 publications

(48 citation statements)

References 19 publications

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“…According to Kawai et al [37], growth of the polymer on the surface of a given substrate can occur even in the case when there is no exact match between the crystallographic distances. A so-called misfit factor (f m ) between the two crystal structures (the β-structure and the substrate) has suggested that it is given with the following expression: (6) where P A and P B are the corresponding periodic distances of the substrate and the polymer, and if f m <15%, an epitaxial growth can be expected from the substrate surface.…”

Section: Crystallization Of Nucleated Polymer and Correlation To The mentioning

confidence: 99%

“…The misfit factors for Ba and Sr pimelates (Table 2) are higher than 15% and are therefore not suitable for epitaxial growth. But, upon losing water, the distances in the crystal lattice decrease (Table 2) causing decrease in f m and its value falling in the range below 15% [37], which makes possible the growth of the crystals of the β-phase of iPP on the surface of these pimelates. Hence, these pimelates, according to the quantity of the β-phase induced upon crystallization of iPP, are good beta nucleators.…”

Section: Crystallization Of Nucleated Polymer and Correlation To The mentioning

confidence: 99%

“…According to these authors, the epitaxial growth of polyolefines proceeds on the nonpolar part of the molecule of the nucleating agent. It should be mentioned that the epitaxy of polymers on inorganic and organic substrates has been studied intensively by many authors [32][33][34][35][36][37][38][39][40][41]. Lotz and Witmann have analyzed heterogeneous nucleation in terms of physical interactions of the polymer and the nucleating agents.…”

Section: Introductionmentioning

confidence: 99%

“…In their extensive study of the nucleation of the -form of iPP [35] it was found that the matching lattice dimension is about 0.5 nm for most of the different active substrates, including various polymers, salts and other compounds. The interactions between the polymers and solid substrate surfaces (including polymeric surfaces, see for instance [39,40]) have been a subject of extensive research activities [34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the nucleating agent with about 0.65 nm periodicity and orthogonal geometry of the contact face could induce the β-form iPP crystals. Kawai et al studied the alignment of the iPP crystals induced by N,N´-dicyclohexyl-2,6-naphthalenedicarboxamide under a magnetic field [37]. Thus, it becomes clear that the selectivity of the nucleating agents can be evaluated by a dimensional lattice matching theory, central part to which is that a rea-sonable epitaxial match occurs between the repeat distance in the iPP unit cell and the corresponding nucleating surface.…”

Section: Introductionmentioning

confidence: 99%

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The correlation between structure and β-nucleation efficiency of Ba, Sr, Ca and Mg pimelates in isotactic polypropylene

Janevski

Bogoeva‐Gaceva

Stefov

et al. 2015

Maced. J. Chem. Chem. Eng.

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The pimelates of the earth-alkaline elements and pimelic acid have been synthesized and studied. All prepared pimelates are crystallohydrates and Ba and Sr pimelates are isotypic. The obtained compounds have been characterized using infrared spectroscopy and X-ray diffraction, and it was found that, near and above the melting temperature of polypropylene, the pimelates of Ba and Sr are crystalline, whereas the ones of Ca and Mg are amorphous. The nucleation activity of these pimelates has been studied in the process of crystallization of polypropylene in non-isothermal conditions and followed by differential scanning calorimetry (at cooling rate V c = 1-20 K min -1 ). It was found that their nucleation activity, even at concentration of 0.1 %, differs considerably with regards to the cooling rate, and they induce different polymorphic composition of the polymer. The nucleation activity was mostly exhibited by Ca pimelate, and when it was used the content of the β crystalline phase (U β ) in polypropylene ranged from 0.90 to 0.94, depending on the cooling rate, compared to 0.18-0.35 when Mg pimelate was used. In the polymer crystallized by using Ba and Sr pimelate as nucleators, U β ranged from 0.47 to 0.77. Based on the theoretical concepts for nucleation activity of solid substrates, an attempt was made to correlate the structurаl features of the synthesized pimelates with their β-nucleation activity in the process of nonisothermal crystallization of iPP. ). Беше најдено дека нивната нуклеациона активност и при концентрации од 0,1 % значително се разликува во зависност од брзината на ладење и се добива различен однос на полиморфните модификации на полимерот. Најизразена беше нуклеационата активност на пимелатот на Ca, а во случајот кога тој беше употребен, содржината на β-кристалната фаза (U β ) во полипропиленот беше од 0,90 до 0,94, во  Dedicated to Academician Gligor Jovanovski on the occasion of his 70 th birthday.A. Janevski, G. Bogoeva-Gaceva, V. Stefov, M. Najdoski Maced. J. Chem. Chem. Eng. 34 (1), 189-199 (2015) 190 зависност од брзината на ладење, споредено со 0,18-0,35 кога беше употребен пимелат на Mg. Во полимерот кристализиран со употреба на пимелати на Ba и Sr како нуклеатори, U β е од 0,47 до 0,77. Имајќи ги предвид теоретските концепти за нуклеационата активност на супстратите, беше направен обид да се корелираат структурите на синтетизираните пимелати со нивната β-нуклеациона активност во процес на неизотермална кристализација на iPP.

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Section: Crystallization Of Nucleated Polymer and Correlation To The mentioning

confidence: 99%

Section: Crystallization Of Nucleated Polymer and Correlation To The mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The correlation between structure and β-nucleation efficiency of Ba, Sr, Ca and Mg pimelates in isotactic polypropylene

Janevski

Bogoeva‐Gaceva

Stefov

et al. 2015

Maced. J. Chem. Chem. Eng.

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Charge storage behavior of isotropic and biaxially‐oriented polypropylene films containing α‐ and β‐nucleating agents

Behrendt

Mohmeyer

Hillenbrand

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:A study on the influence of the crystal modification (␣ and ␤) of isotactic polypropylene (i-PP) films on the resulting electret properties is presented. Two commercial nucleating agents, sodium 2,2Ј-methylene-bis(4,6-di-tertbutylphenyl)-phosphate (NA11) and N,NЈ-dicyclo-hexyl-2,6-naphthalene-dicarbox-amide (NU100), were employed in this investigation. Isothermal charge decay was measured at 90°C. In hot pressed isotropic polypropylene films, no significant differences in the charge storage properties were observed for ␣-and ␤-nucleated specimens. In addition, the article presents the influence of the nucleating agents at different concentrations on the PP-film morphology of biaxially stretched films with respect to electret features. It was possible to prepare elongated cavities with the virtually insoluble NA11 additive during stretching, even at concentrations below 0.3 wt %. These films displayed slightly improved electret properties in comparison to stretched neat PP films due to generated cavities acting as barriers for the drift of charges. Various draw ratios were also studied for i-PP films with 0.15 wt % NA11.

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Effect of N,N′‐diphenyl adipamide on the formation of the β‐crystalline form in isotactic polypropylene

Dou

2008

J of Applied Polymer Sci

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ABSTRACT:The polymorphic compositions and mechanical properties of isotactic polypropylene (iPP) samples nucleated by a selective b-nucleating agent [N,N 0 -diphenyl adipamide (DPA)] were investigated with wide-angle X-ray diffraction, polarized light microscopy, scanning electron microscopy, and mechanical tests. It was found that b-phase crystals emerged with the addition of DPA, and the relative proportion of the b-crystalline form reached the maximum value of 0.97 with the addition of 0.1 wt % DPA. The curved lamellae in the b spherulites were like flowers. The b spherulites were etched more easily than a spherulites because amorphous regions were distributed inside the b spherulites. The Izod notched impact strength increased sharply with the addition of DPA and attained the maximum value of 7.30 kJ/m 2 (the value of blank iPP was 3.13 kJ/m 2 ) with the addition of 0.1 wt % DPA. An analysis of the misfit factors between DPA and b-iPP showed that b-iPP could epitaxially crystallize on the DPA crystal well.

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Crystal orientation of β-phase isotactic polypropylene induced by magnetic orientation of N,N′-dicyclohexyl-2,6-naphthalenedicarboxamide

Cited by 89 publications

References 19 publications

The correlation between structure and β-nucleation efficiency of Ba, Sr, Ca and Mg pimelates in isotactic polypropylene

The correlation between structure and β-nucleation efficiency of Ba, Sr, Ca and Mg pimelates in isotactic polypropylene

Charge storage behavior of isotropic and biaxially‐oriented polypropylene films containing α‐ and β‐nucleating agents

Effect of N,N′‐diphenyl adipamide on the formation of the β‐crystalline form in isotactic polypropylene

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