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

Liu, Xiaoqing; Li, Chuncheng; Zhang, Dong; Wan, Zhinian

doi:10.1002/app.24625

Cited by 15 publications

(12 citation statements)

References 34 publications

(26 reference statements)

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“…Copolymers have higher degradation rates than homopolymers, basically because they have lower crystallinity. Therefore, some tests on PBSu and its various copolyesters have been conducted to examine their morphologies, crystallization kinetics, and melting behaviors 9, 14–17. Poly(propylene succinate) (PPSu), with an odd number of methylene groups in the diol monomer, has low crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and kinetics of thermal degradation of poly(butylene succinate‐co‐propylene succinate)s

Chen

2011

J of Applied Polymer Sci

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Poly(butylene succinate) (PBSu) and two PBSu-rich poly(butylene succinate-co-propylene succinate)s were studied. Copolyesters were characterized as random copolymers, based on 13 C-NMR spectra. TGA-FTIR was used to monitor the degradation products at a heating rate of 5 C/min under N 2 . FTIR spectra revealed that the major products were anhydrides, which were formed following two cyclic intramolecular degradation mechanisms by the breaking of the weak O-CH 2 bonds around succinate groups. Thermal stability at heating rates of 1, 3, 5, and 10 C/min under N 2 was investigated using TGA. The model-free methods of the Friedman and Ozawa equations are useful for studying the activation energy of degradation in each period of mass loss. The results reveal that the random incorporation of minor propylene succinate units into PBSu did not markedly affect their thermal resistance. Two model-fitting mechanisms were used to determine the mass loss function f(a), the activation energy and the associated mechanism. The mechanism of autocatalysis nth-order, with f(a) ¼ a m (1 À a) n , fitted the experimental data much more closely than did the nth-order mechanism given by f(a) ¼ (1 À a) n . The obtained activation energy was used to estimate the failure temperature (T f ). The values of T f for a mass loss of 5% and an endurance time of 60,000 h are 160.7, 155.5, and 159.3 C for PBSu and two the copolyesters, respectively.

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Section: Introductionmentioning

confidence: 99%

Mechanisms and kinetics of thermal degradation of poly(butylene succinate‐co‐propylene succinate)s

Chen

2011

J of Applied Polymer Sci

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“…Copolymers have higher degradation rates than homopolymers, basically because of their reduced crystallinity. Accordingly, some tests have been performed to study the morphologies, crystallization kinetics, and melting behaviors of PBSu and its various copolyesters 11, 16–19. Poly(propylene succinate) (PPSu) with an odd number (3) of methylene groups in the diol monomer has gained increasing attention, because it has a higher biodegradation rate than that with two or four methylene groups in the diol monomer 20–23.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal crystallization kinetics of biodegradable poly(butylene succinate‐co‐propylene succinate)s

Chen

Shih

et al. 2010

J Polym Sci B Polym Phys

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Poly(butylene succinate) (PBSu) and two poly(butylene succinate‐co‐propylene succinate)s were synthesized via the direct polycondensation reaction. The copolyesters were characterized as having 7.0.and 11.5 mol % propylene succinate (PS) units, respectively, by 1H NMR. A differential scanning calorimeter (DSC) and a polarized light microscope (PLM) adopted to study the nonisothermal crystallization of these polyesters at a cooling rate of 1, 2, 3, 5, 6, and 10 °C/min. Morphology and the isothermal growth rates of spherulites under PLM experiments were monitored and obtained by curve‐fitting. These continuous rate data were analyzed with the Lauritzen−Hoffman equation. A transition of regime II → III was found at 95.6, 84.4, and 77.3 °C for PBSu, PBPSu 95/5, and PBPSu 90/10, respectively. DSC exothermic curves show that all of the nonisothermal crystallization occurred in regime III. DSC data were analyzed using modified Avrami, Ozawa, Mo, Friedman, and Vyazovkin equations. All the results of PLM and DSC measurements indicate that incorporation of minor PS units into PBSu markedly inhibits the crystallization of the resulting polymer. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1299–1308, 2010

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“…In order to get a straightforward compare about the rate of crystallization rate for pure PBS and its composites during non‐isothermal crystallization process, the parameter titled “crystallization rate coefficient (CRC)” was employed by Khanna . The CRC values can be obtained from the slopes of the curves about the cooling rates φ versus the crystallization peak temperatures T p and it showed a variation in cooling rate which is needed to result in 1°C change in the supercooling for the polymer .…”

Section: Resultsmentioning

confidence: 99%

“…However, the physical significance of n and Z t for non‐isothermal crystallization process is different with the meaning for isothermal crystallization process for the reason that the constant change in temperature influences both the nuclei formation and the growth of spherulite. Thus, these values of n and Z t for the non‐isothermal crystallization should be corrected, and a lot of scientists had done much work for the correction of Avrami equation with the physical truth . Considering the constant change in temperature and the cooling rate (φ), Jeziorny fully changed Z t as following equation:

\log Z_{c} = \frac{\log Z_{t}}{ϕ}

where Z c denotes the crystallization rate constant.…”

Section: Resultsmentioning

confidence: 99%

“…For PBS composites, however, there are only a few reports on PBS composites filled with mica . As we know, mechanical properties, biodegradable properties and thermal properties are greatly influenced by crystallization behavior and kinetics related to the thermal process . Therefore, to better understand the relationship between mica and its PBS composites, characterize materials, and optimize processing parameters, the crystal structure, the crystallization kinetics and crystallization morphology should be studied, especially in the non‐isothermal crystallization process for the reason that the non‐isothermal conditions is of meaningful practical significance .…”

Section: Introductionmentioning

confidence: 99%

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Non‐isothermal crystallization kinetics and morphology of mica particles filled biodegradable poly(butylene succinate)

Zhang

Tan

et al. 2013

J of Applied Polymer Sci

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Biodegradable poly(butylene succinate) (PBS)/mica composites were prepared by melt blending. The non-isothermal crystallization kinetics, spherulitic morphology, and crystalline structure were investigated by DSC, POM, and WAXD, respectively. The concepts of ''crystallization rate coefficient'' and ''crystallization rate parameter'' were employed. The non-isothermal crystallization behavior was successfully analyzed by Avrami and Liu methods while the Ozawa method failed to describe it. The WAXD and POM results showed that the addition of mica did not alter the crystalline structure, but increased the number of nuclei and reduced the size of the spherulites. In addition, the activation energy was also obtained from Hoffman-Lauritzen theory. These results showed that the addition of mica into PBS matrix played a dual role: they acted as nucleation agents to promote the process of nucleation, while acted as physical impediments to retard the growth of crystal. The former was dominating as the crystallization rates of mica/ PBS composites were accelerated.

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

Cited by 15 publications

References 34 publications

Mechanisms and kinetics of thermal degradation of poly(butylene succinate‐co‐propylene succinate)s

Mechanisms and kinetics of thermal degradation of poly(butylene succinate‐co‐propylene succinate)s

Nonisothermal crystallization kinetics of biodegradable poly(butylene succinate‐co‐propylene succinate)s

Non‐isothermal crystallization kinetics and morphology of mica particles filled biodegradable poly(butylene succinate)

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