Effect of chemical structure on crystallization behavior of poly(phenylene alkylene dicarboxylate) (PPAD)

Youk, Ji Ho; Ha, Wan Shik; Jo, Won Ho; Park, Chong Rae

doi:10.1002/(sici)1097-4628(19971121)66:8<1575::aid-app19>3.0.co;2-2

Cited by 2 publications

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“…46 The same behavior is reported for poly(phenylene alkylene dicarboxylate)s with different lengths of the aliphatic units. 47 This trend is generally attributed to an increment in the chain flexibility. The different behavior observed for the poly(alkylene dicarboxylate)s analyzed suggests that the chain flexibility is not the only fundamental parameter that causes the melting behavior.…”

Section: Resultsmentioning

confidence: 99%

Thermal properties of poly(alkylene dicarboxylate)s derived from 1,12‐dodecanedioic acid and even aliphatic diols

Celli

Barbiroli

Berti

et al. 2007

J Polym Sci B Polym Phys

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A series of new aliphatic polyesters derived from 1,12-dodecanedioic acid and different diols with an even number of methylene units have been studied to assess the effect of the chemical structure on the final thermal properties of the materials. The polyesters have high thermal stability and are fast crystallizing polymers, with crystallization rate similar to that of polyethylene (PE). This behavior is connected to the fact that long aliphatic chains assume conformational characteristics very similar to that of PE. However, the polyester prepared from ethanediol shows a peculiar behavior (for example, double melting peak, melting and crystallization temperatures, which do not fit the trend of those of the other samples and ringed spherulites) owing to a probable different conformation, deviating from the all-trans planar typical of PE. In the isothermal crystallization studies, a bell-shape trend has been found for the crystallization rate as a function of the number of À À(CH 2 )À À units in the diol. The high crystallization rate of the sample with long À À(CH 2 )À À sequences has been attributed to the high chain flexibility and, thus, high mobility in the molten state and ease of chain folding. By reducing the aliphatic sequence length, instead, implications of the structural characteristics of the samples are probably involved.

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Section: Resultsmentioning

confidence: 99%

Thermal properties of poly(alkylene dicarboxylate)s derived from 1,12‐dodecanedioic acid and even aliphatic diols

Celli

Barbiroli

Berti

et al. 2007

J Polym Sci B Polym Phys

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Thermodynamic properties and crystallization behavior of poly(p-phenylene succinate)

Youk

et al. 1999

J. Appl. Polym. Sci.

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ABSTRACT:The equilibrium thermodynamic properties and crystallization behavior of poly(p-phenylene succinate) (PPSc) were examined using differential scanning calorimetry (DSC) and a wide-angle X-ray diffractometer. When PPSc quenched into liquid nitrogen, the PPSc still showed 60 J/g of the heat of fusion, indicating that PPSc crystallizes too fast to be quenched to a glassy state. The equilibrium heat of fusion (⌬H°) of PPSc and its equilibrium entropy of fusion (⌬S°) were estimated to be 28 and 48 J/mol K, respectively. The effect of the molecular weight and undercooling on PPSc crystallization was analyzed by the Avrami expression. The crystallization rate of PPSc was highest at about 276°C, regardless of molecular weight when the sample was isothermally crystallized. This temperature was higher than that of poly(ethylene terephthalate) (PET) by 100°C. The crystallization rate was highest when the number average molecular weight of PPSc was about 20,000 g/mol.

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Effect of chemical structure on crystallization behavior of poly(phenylene alkylene dicarboxylate) (PPAD)

Cited by 2 publications

References 7 publications

Thermal properties of poly(alkylene dicarboxylate)s derived from 1,12‐dodecanedioic acid and even aliphatic diols

Thermal properties of poly(alkylene dicarboxylate)s derived from 1,12‐dodecanedioic acid and even aliphatic diols

Thermodynamic properties and crystallization behavior of poly(p-phenylene succinate)

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