Calcium dicarboxylates nucleation of β‐polypropylene

Li, Xiaojun; Hu, Keliang; Ji, Mingrong; Yunlan, Huang; Zhou, Guien

doi:10.1002/app.10913

Cited by 89 publications

(54 citation statements)

References 32 publications

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“…it is 137 cm -1 . This difference in the IR spectra of barium and strontium pimelate is 155 cm -1 (taking the frequency of the stretching symmetric COO mode as 1395 cm -1 ) and is close to the values found in the spectra of calcium pimelate (Δν = 160 [58]) and magnesium pimelate. On the other hand, in the structure of barium and strontium pimelates [42][43][44] it was found that the coordination mode of carboxylate groups is bridging tridentate.…”

Section: Fig 1 Infrared Spectra Of the Synthesized Pimelatessupporting

confidence: 80%

“…7), which is in accordance with literature data [25,58,29]. We have tried to evaluate the nucleation activity by determination of the content of the β-phase in the crystal phase of iPP since U β , in certain conditions, depends only on the character of the nucleating agent.…”

Section: Crystallization Of Nucleated Polymer and Correlation To The supporting

confidence: 75%

“…But, one should also consider that these criteria are not always strict and should be critically observed. Based on the difference between the frequencies of the antisymmetric and symmetric COO strechings modes Li et al [58] concluded that chelate coordination exists between the calcium ion and carbonyl groups in calcium pimelate. Following this model, it is implied that in the structure of magnesium pimelate, a chelate coordination of carboxylate groups exists.…”

Section: Fig 1 Infrared Spectra Of the Synthesized Pimelatesmentioning

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: Fig 1 Infrared Spectra Of the Synthesized Pimelatessupporting

confidence: 80%

Section: Crystallization Of Nucleated Polymer and Correlation To The supporting

confidence: 75%

Section: Fig 1 Infrared Spectra Of the Synthesized Pimelatesmentioning

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 modification of iPP ranges from the addition of rubbers, [1][2][3][4][5] thermoplastic elstomers, [6][7][8][9][10][11][12][13] rigid inorganic and organic fillers, 4,14 b-nucleating agent 15,16 to introduction of comonomers 17,18 and polymerization of in-reactor iPP catalloy, 19,20 etc. The well-known rubbery iPP modifiers included EPR, EPDM, SEBS, and so on.…”

Section: Introductionmentioning

confidence: 99%

Phase separation induced morphology evolution andcorresponding impact fracture behavior of iPP/PEOc blends

Pang

Dong

Zhao

et al. 2011

J of Applied Polymer Sci

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In this study, the influence of phase separation on impact toughness of isotactic polypropylene (iPP)/ poly(ethylene-co-octene) (PEOc) blends was investigated. For the typical toughened polymeric system, three iPP/ PEOc compositions (80/20, 70/30, and 60/40) were selected. When the polymeric blends were annealed at 200 C, the coarsening of phase domains was more prominent for the blend containing higher content of PEOc, and the scale of its morphological evolution was increased as well. The impact test showed that the impact strength variation trend as a function of annealing time was closely related to morphological evolution. It was believed that the sharpening of phase boundary and coarsening of phase domains were responsible for the depression of impact toughness, and the probable fracture mode alteration from shear banding to crazing and voiding. Structure evolution induced by phase separation showed an important effect on impact toughness, and it was also affected by the environmental conditions. Proper temperature was required to catch the tough-brittle transition induced by phase separation. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: [445][446][447][448][449][450][451][452][453] 2011

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“…8 The preparation of 100% pure b-hexagonal phase polymer is reported by Li et al 9 In the unit cell of hexagonal phase, the helices are located in alternative rows with opposite direction and they possess the same sense of rotation. The axial repeat distance of hexagonal phase is found to be slightly less (c ¼ 0.635 nm) 5 than that found in the monoclinic cell (c ¼ 0.650 nm).…”

Section: Introductionmentioning

confidence: 96%

The influence of annealing treatment on the molecular structure and the mechanical properties of isotactic polypropylene fibers

Karacan

Benli

2011

J of Applied Polymer Sci

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An investigation was carried out on the effects of annealing treatment on the molecular structure and the mechanical properties of isotactic polypropylene fibers annealed in an air heated environment at temperatures ranging from 60 to 140 C. Analysis of the equatorial Xray diffraction traces showed the presence of a three phase system of amorphous-smectic-monoclinic forms and revealed the transformation of the metastable smectic form to the highly stable monoclinic form as the annealing temperature is increased, resulting in an enhanced degree of crystallinity and the crystallite size. The improvements in the degree of crystallinity and the crystallite size became more remarkable above 120 C. Evaluation of the crystallinity was carried out using an analysis of density, infrared spectroscopy, and X-ray diffraction methods whereas the state of the molecular orientation was evaluated using polarized infrared spectroscopy measurements only. Polarized infra-red spectroscopy measurements after the curve fitting procedure showed a slight increase of the molecular orientation of the helical chain segments present in the crystalline phase represented by the IR bands at 841 and 998 cm À1 whereas the amorphous structure represented by the IR band at 974 cm À1 showed no significant change with increasing annealing temperature. The improvement in the molecular orientation of the crystalline phase became more remarkable above 120 C. Tensile strength of the annealed fibers increased with increasing annealing temperature but the elongation at break and the initial modulus were not affected as much as the tensile strength.

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Calcium dicarboxylates nucleation of β‐polypropylene

Cited by 89 publications

References 32 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

Phase separation induced morphology evolution andcorresponding impact fracture behavior of iPP/PEOc blends

The influence of annealing treatment on the molecular structure and the mechanical properties of isotactic polypropylene fibers

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