Isothermal and nonisothermal crystallization kinetics of a semicrystalline copolyterephthalamide based on poly(decamethylene terephthalamide)

Liu, Hongzhi; Yang, Guisheng; He, Aihua; Wu, Meiyan

doi:10.1002/app.21011

Cited by 18 publications

(13 citation statements)

References 24 publications

(18 reference statements)

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“…The Avrami theory that was modified by Jeziorny has been used to analyze nonisothermal crystallization kinetics . The Avrami equation was used in the following form:

1 - X_{t} = \exp (- Z_{t} t^{n})

where Z t is the Avrami constant rate, n is the Avrami exponent and X t is the relative crystallinity at temperature T , which can be defined by

X_{t} = \frac{\int_{0}^{t} (d H (t) / d t) d t}{\int_{0}^{\infty} (d H (t) / d t) d t}

where (d H (t)/d t ) is the heat flow and X t ( t ) and X t (∞) indicate the absolute crystallinity at time t and at the end of the crystallization process.…”

Section: Methodsmentioning

confidence: 99%

Influence of a sorbitol‐based nucleating agent modified with silsesquioxanes on the non‐isothermal crystallization of isotactic polypropylene

Barczewski

Dobrzyńska‐Mizera

Dudziec

et al. 2013

J of Applied Polymer Sci

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This article investigates the effect of modifying the polypropylene (iPP) a-phase nucleating agent 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS) with tetrasilanolphenyl silsesquioxane (phPOSS). It has been proven that an increasing amount of silsesquioxane leads to differences in the crystallization behavior. What is more, it has been observed that the nucleation effect that results from the addition of sorbitol derivatives is suppressed by phPOSS activity. To understand the influence of phPOSS addition on the crystallization kinetics of PP/DMDBS/phPOSS composites that have been prepared by melt processing in a twin screw extruder, differential scanning calorimetry, rotational rheometry and Fourier transform infrared spectroscopy are performed.

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“…The Avrami theory that was modified by Jeziorny has been used to analyze nonisothermal crystallization kinetics . The Avrami equation was used in the following form:

1 - X_{t} = \exp (- Z_{t} t^{n})

where Z t is the Avrami constant rate, n is the Avrami exponent and X t is the relative crystallinity at temperature T , which can be defined by

X_{t} = \frac{\int_{0}^{t} (d H (t) / d t) d t}{\int_{0}^{\infty} (d H (t) / d t) d t}

where (d H (t)/d t ) is the heat flow and X t ( t ) and X t (∞) indicate the absolute crystallinity at time t and at the end of the crystallization process.…”

Section: Methodsmentioning

confidence: 99%

Influence of a sorbitol‐based nucleating agent modified with silsesquioxanes on the non‐isothermal crystallization of isotactic polypropylene

Barczewski

Dobrzyńska‐Mizera

Dudziec

et al. 2013

J of Applied Polymer Sci

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“…Wang and Zhang [91] have made and tested semi-aromatic polymers containing 10, 11, 12, and 13-carbon straightchain diamines. Jackson [84] and Liu et al [97] have studied PA 10T. Quynn [98] spun fibers from PA 6T, following the lead of Sprague and Singleton.…”

Section: Polyamides Of Semi-aromatic Compositionmentioning

confidence: 98%

Polyamides – Still Strong After Seventy Years

Marchildon¹

2010

Macro Reaction Engineering

350

141

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Polyamides are a subject of enduring interest because of their variety, their complex internal structures, their commercial importance and versatility, and their various chemistries of preparation and of long‐term use. The present review introduces these polymers and then discusses the first of the above aspects, namely the variety of the polyamides. Here, together, the full family is presented, classified conveniently according to the types and combinations of monomers from which they are constructed. magnified image

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“…32 The value of CRC could be determined from the slope of the plot of cooling rate versus the crystallization peak temperature T p . According to the definition, the CRC values are higher for faster crystallization systems.…”

Section: Crystallization Rate Coefficientmentioning

confidence: 99%

Non‐isothermal crystallization kinetics and melting behaviors of poly(butylene succinate) and its copolyester modified with trimellitic imide units

Liu¹,

Li²,

Zhang³

et al. 2006

J of Applied Polymer Sci

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With the help of differential scanning calorimeter (DSC), the basic thermal behaviors, nonisothermal crystallization kinetics, and subsequent melting behaviors of poly(butylene succinate) (PBS) and its copolyester (PBSTMA) modified with trimellitic imide units were investigated in this paper. The DSC thermograms of PBS and PBSTMA showed that the crystallization behaviors of PBS were affected seriously because of the addition of a small quantity of trimellitic imide units. The nonisothermal crystallization processes of them were represented by the Avrami equation modified by Jeziorny and the method developed by Ozawa. After that, the conception of ''crystallization rate coefficient (CRC)'' introduced by Khanna was employed. The values of CRC for PBS and PBSTMA are 174.6 and 88.2 h -1 , respectively. At the end of this paper, the melting behaviors of PBS and PBSTMA after being cooled from 130 to 308C at different cooling rate were studied in detail.

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Isothermal and nonisothermal crystallization kinetics of a semicrystalline copolyterephthalamide based on poly(decamethylene terephthalamide)

Cited by 18 publications

References 24 publications

Influence of a sorbitol‐based nucleating agent modified with silsesquioxanes on the non‐isothermal crystallization of isotactic polypropylene

Influence of a sorbitol‐based nucleating agent modified with silsesquioxanes on the non‐isothermal crystallization of isotactic polypropylene

Polyamides – Still Strong After Seventy Years

Non‐isothermal crystallization kinetics and melting behaviors of poly(butylene succinate) and its copolyester modified with trimellitic imide units

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