Nonisothermal melt-crystallization kinetics for three linear aromatic polyesters

Supaphol, Pitt; Dangseeyun, Nujalee; Srimoaon, Phornphon; Nithitanakul, Manit

doi:10.1016/s0040-6031(03)00258-2

Cited by 91 publications

(77 citation statements)

References 25 publications

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“…Our model, as stated above, duly considers isokinetic concept, crystal growth as well as primary and secondary crystallizations; and mathematically shows that the activation energy does not depend on cooling rate. Based on the overall findings of Figures 9 and 10, this study ratifies the invariance of activation energy articulated by Galwey and cothinkers, 100,101 and does not support the concept of variable/instantaneous activation energy 94,98,99,[102][103][104] which is practiced in analyzing nonisothermal crystallization kinetic data. This conclusion originates from the appropriate application of isokinetic concept and the current nonisothermal Avrami-Erofeev crystallization model, and the calculation algorithm that we developed.…”

Section: Crystallization Kinetics Of the As-synthesized Polyethylenesmentioning

confidence: 65%

“…This ratifies the invariance of activation energy articulated by Galwey and cothinkers, 100,101 and does not support the concept of variable/instantaneous activation energy 94,98,99,[102][103][104] which is practiced in analyzing nonisothermal kinetic data. The nucleation process, intermediate between instantaneous and sporadic, generated crystal dimensions that varied between cylindrical and spherical.…”

mentioning

confidence: 69%

“…Depending on the polymer type, it either monotonically increases, or it first increases and then it decreases as the relative crystallinity increases. 98 This functional behavior was attributed to the dependence of nucleation energy barrier on temperature. Such a justification ignores isokinetic concept, crystal growth as well as primary and secondary crystallizations.…”

Section: Crystallization Kinetics Of the As-synthesized Polyethylenesmentioning

confidence: 99%

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(ⁿBuCp)₂ZrCl₂‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

et al. 2016

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The judicious design of methylaluminoxane (MAO) anions expands the scope for developing industrial metallocene catalysts. Therefore, the effects of MAO anion design on the backbone structure, melt behavior, and crystallization of ethylene24-methyl-1-pentene (E24M1P) copolymer were investigated. Ethylene was homopolymerized, as well as copolymerized with 4M1P, using (1) , opposite to the supported analogue, acted as a co-chain transfer agent with 4M1P. The modeling of polyethylene melting and crystallization kinetics, including critical crystallite stability, produced insightful results. This study especially illustrates how branched polyethylene can be prepared from ethylene alone using particularly one metallocene-MAO ion pair, and how a compound, that functionalizes silica as well as terminates the chain, can synthesize ethylene2a-olefin copolymers with novel structures. Hence, it unfolds prospective future research niches in polyethyne systhesis.

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Section: Crystallization Kinetics Of the As-synthesized Polyethylenesmentioning

confidence: 65%

mentioning

confidence: 69%

Section: Crystallization Kinetics Of the As-synthesized Polyethylenesmentioning

confidence: 99%

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(ⁿBuCp)₂ZrCl₂‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

et al. 2016

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“…Based on previous non-isothermal melt-crystallization kinetic analyses for these three polyesters [20], comparison of the values of the Ziabicki's kinetic crystallizability parameter (which describes the ability for a semicrystalline polymer to crystallize when it is cooled from the melt to the glassy state at a Table 1 Overall crystallization kinetic data for PET, PTT, and PBT based on the Avrami model …”

Section: −1mentioning

confidence: 99%

Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

et al. 2004

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Isothermal crystallization and subsequent melting behavior for three different types of linear aromatic polyester, namely poly(ethylene terephthalate) (PET), poly(trimethylene terephthalate) (PTT), and poly(butylene terephthalate) (PBT), were investigated (with an emphasis on PTT in comparison with PET and PBT). These polyesters were different in the number of methylene groups (i.e. 2, 3, and 4 for PET, PTT, and PBT, respectively). Isothermal crystallization studies were carried out in a differential scanning calorimeter (DSC) over the crystallization temperature range of 182-208• C. The wide-angle X-ray diffraction (WAXD) technique was used to obtain information about crystal modification and apparent degree of crystallinity. The kinetics of the crystallization process was assessed by a direct fitting of the experimental data to the Avrami, Tobin, and Malkin macrokinetic models. It was found that the crystallization rates of these polyesters were in the following order: PBT > PTT > PET, and the melting of these polyesters exhibited multiple-melting phenomenon. Lastly, the equilibrium melting temperature for these polyesters was estimated based on the linear and non-linear Hoffman-Weeks (LHW and NLHW) extrapolative methods.

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“…Avrami equation [24][25][26][27][28][29][30][31][32][33][34] can be used to describe the primary stage of nonisothermal crystallization. The Avrami equation is expressed as:…”

Section: Avrami Modelmentioning

confidence: 99%

Non-isothermal Crystallization of Poly(ethylene-co-glycidyl methacrylate)/Silica Nanocomposites

Huang

Kang²,

Lin

et al. 2005

Polym J

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ABSTRACT:Nano-sized silica particles were modified by -aminopropyltriethoxysilane and the modified and unmodified silica particles were then respectively compounded with poly(ethylene-co-glycidyl methacrylate) (PEGMA) in a twin-screw extruder. Non-isothermal crystallization behaviors of neat PEGMA, PEGMA/unmodified silica (Silica), and PEGMA/modified silica (A-Silica) were studied by differential scanning calorimeter at various cooling rates. Modified Avrami model, Ozawa model, and Liu model all successfully described the non-isothermal crystallization processes of the samples. All these models predicted correctly that the crystallization rate follows the order: PEGMA/ Silica > PEGMA/A-Silica > PEGMA. Calculated activation energies for the non-isothermal crystallization processes also indicated that the addition of silica accelerated the crystallization process of PEGMA, whereas the silica particles also retarded the crystallization process if well dispersed. [DOI 10.1295/polymj.37.418] KEY WORDS Nanocomposite / Non-isothermal Crystallization / Kinetics / The incorporation of an inorganic network into a polymer matrix has been extensively studied because it exhibits a wide range of multifunctional properties. Organic-inorganic nanocomposites could dramatically improve material properties because they frequently exhibit unexpected hybrid properties that are synergistically derived from the two components. [1][2][3][4][5] In comparison with neat polymers and microparticulate composites, these improvements are achieved at low concentrations of the inorganic components (1-10 wt %); this contrasts strongly with conventional filled polymers, which generally require high loadings within the range of 25-40 wt %. The control of morphology and phase separation is critical in the preparation and application of organic/inorganic hybrid composites. The introduction of well-dispersed and nanoscale size inorganic domains into a polymer matrix and the control of compatibility between organic and inorganic interphases will result in the maximum effectiveness in a given hybrid composite. The tendency of nanoparticles to agglomerate makes the preparation of polymer-based nanocomposites difficult with the processing techniques common to conventional plastics. Researchers have attempted many specific routes to break down nanoparticle agglomerates and to produce nanostructured composites. [6][7][8][9][10][11][12] The properties of nanocomposites strongly depend on the organic matrix, nanoparticles, and the way in which they were prepared. Chemical surface modification is widely used to obtain a high wettability for a solid surface, a good dispersion of particles, and adhesion of fillers in composite materials. 13In crystalline thermoplastics, the crystalline morphology and the degree of crystallinity are the most important variables in determining mechanical and physical properties of the final products. The crystallization of these polymers is often influenced not only by processing conditions, but also by the presence of the rein...

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Nonisothermal melt-crystallization kinetics for three linear aromatic polyesters

Cited by 91 publications

References 25 publications

(ⁿBuCp)₂ZrCl₂‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

(ⁿBuCp)₂ZrCl₂‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

Non-isothermal Crystallization of Poly(ethylene-co-glycidyl methacrylate)/Silica Nanocomposites

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Nonisothermal melt-crystallization kinetics for three linear aromatic polyesters

Cited by 91 publications

References 25 publications

(nBuCp)2ZrCl2‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

(nBuCp)2ZrCl2‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

Non-isothermal Crystallization of Poly(ethylene-co-glycidyl methacrylate)/Silica Nanocomposites

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(ⁿBuCp)₂ZrCl₂‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization

(ⁿBuCp)₂ZrCl₂‐catalyzed ethylene‐4M1P copolymerization: Copolymer backbone structure, melt behavior, and crystallization