Synthesis and characterization of triblock copolymer PLA-b-PBT-b-PLA and its effect on the crystallization of PLA

Zhou, Jian; Jiang, Zhiqiang; Wang, Zongbao; Zhang, Jianqiang; Li, Jun; Li, Ya; Zhang, Ruoyu; Chen, Peng; Gu, Qun

doi:10.1039/c3ra42096e

Cited by 27 publications

(19 citation statements)

References 43 publications

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“…Moreover, additional solid state polycondensation (SSP) can promote the chain growth to obtain improved final product [46]. It is worth highlighting that M n values are much higher than the ones reported in work by Zhu et al [30] on similar PLA-b-PBTb-PLA copolymers with high PLA content. In contrast to the materials prepared by reactive blending, an increasing trend in molecular weight change in the PBT/PLA blend series was found.…”

Section: Results and Discussion 31 Synthesis And Molecular Charactementioning

confidence: 90%

“…Only copolymers studied by Olewnik et al [24] containing equimolar terephthalate/lactate ratio exhibited some block copolymer character. Furthermore, copolymers of PBT and PLLA as a major component (PLA-b-PBTb-PLA) with relatively defined blocky structure were synthesized via ring opening polymerization of LA with bis-(4-hydroxybutyl) terephthalate (BHBT) in solution [30]. Although this method promoted the organization into blocky structure, the obtained product exhibited very limited number average molecular weight (M n ) with a maximum value of 81.1 g/mol.…”

Section: Introductionmentioning

confidence: 99%

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Poly(butylene terephthalate)/polylactic acid based copolyesters and blends: miscibility-structure-property relationship

Irska¹,

Paszkiewicz²,

Gorący³

et al. 2020

Express Polym. Lett.

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A series of aliphatic-aromatic copolyesters based on poly(butylene terephthalate) (PBT) and poly(lactic acid) (PLA) have been synthesized by means of a novel reactive blending procedure coupled with polycondensation in melt. The obtained copolymers were further compared with PBT and PLA homopolymers and PBT/PLA non-compatibilized physical blends in order to investigate the effect of transesterification reactions on the structural, morphological, thermal and mechanical performance. Properties of the obtained materials have been found strictly dependent on the preparation process and blend/copolymer composition. The PBT/PLA physical blends appeared as highly crystalline, phase separated systems that exhibit brittle behavior. On the other hand, the applied method of reactive blending enhanced interfacial adhesion and promoted the arrangement of PBT and PLA in blocks of different lengths. Although the PBT-b-PLA copolyesters were found to be miscible in amorphous phase, the phase separation that has arisen from PBT crystalline domains occurs. Along with an increase in PLA weight fraction in copolymers, the length of aromatic sequences decreased which in turn resulted in shifting the values of melting temperatures (T m) toward lower ones and decreased the degree of crystallinity (x c). Moreover, PBT-b-PLA copolymer with 30 wt% of PLA units has been demonstrated as a promising thermoplastic shape memory polymer (SMP) with a switching temperature of 35°C.

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Section: Results and Discussion 31 Synthesis And Molecular Charactementioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Poly(butylene terephthalate)/polylactic acid based copolyesters and blends: miscibility-structure-property relationship

Irska¹,

Paszkiewicz²,

Gorący³

et al. 2020

Express Polym. Lett.

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show abstract

“…The addition of a nucleating agent can improve not only the crystallization rate of PLA but also its thermal stability. [27][28][29][30][31] For example, the use of nucleating agents such as talc enhanced the crystallization rate of PLLA. 32,33 Natural nucleating agents like cashew gum 34 or granular starch 35 were also used in PLA.…”

Section: Introductionmentioning

confidence: 99%

Influence of poly(lactide) stereocomplexes as nucleating agents on the crystallization behavior of poly(lactide)s

et al. 2019

RSC Adv.

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“…Unfortunately, the low crystallinity and poor heat resistance of the PLA limit its application . Many efforts have been made to improve the heat resistance of PLA, such as blending, nucleating agents, crosslinking, and nanoparticles …”

Section: Introductionmentioning

confidence: 99%

Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

Xie

Wang

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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The miktoarm star‐shaped poly(lactic acid) (PLA) copolymer, (PLLA)2‐core‐(PDLA)2, was synthesized via stepwise ring‐opening polymerization of lactide with dibromoneopentyl glycol as the starting material. 1H NMR and FTIR spectroscopy proved the feasibility of synthetic route and the successful preparation of star‐shaped PLA copolymers. The results of FTIR spectroscopy and XRD showed that the stereocomplex structure of the copolymer could be more perfect after solvent dissolution treatment. Effect of chain architectures on crystallization was investigated by studying the nonisothermal and isothermal crystallization of the miktoarm star‐shaped PLA copolymer and other stereocomplexes. Nonisothermal differential scanning calorimetry and polarizing optical microscopy tests indicated that (PLLA)2‐core‐(PDLA)2 exhibited the fastest formation of a stereocomplex in a dynamic test due to its special structure. In isothermal crystallization tests, the copolymer exhibited the fast crystal growth rate and the most perfect crystal morphology. The results reveal that the unique molecular structure has an important influence on the crystallization of the miktoarm star‐shaped PLA copolymer. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 814–826

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Synthesis and characterization of triblock copolymer PLA-b-PBT-b-PLA and its effect on the crystallization of PLA

Cited by 27 publications

References 43 publications

Poly(butylene terephthalate)/polylactic acid based copolyesters and blends: miscibility-structure-property relationship

Poly(butylene terephthalate)/polylactic acid based copolyesters and blends: miscibility-structure-property relationship

Influence of poly(lactide) stereocomplexes as nucleating agents on the crystallization behavior of poly(lactide)s

Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

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