Classification of aliphatic-butylene terephthalate copolyesters in relation to aliphatic/aromatic ratio

Wojtczak, Malgorzata; Dutkiewicz, Sławomir; Gałęski, Andrzej; Gutowska, Agnieszka

doi:10.1016/j.polymer.2017.02.054

Cited by 20 publications

(20 citation statements)

References 37 publications

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“…Slight increase of L LA from 1.26 to 1.38 was observed suggesting that the LA units are rather short, irrespective of the initial composition. Anyway, all copolymers exhibit B value bellow 1, pointing out that T, BG and LA units tend to form block copolymers under reactive melt blending process [6,43]. Being more precise, short-block copolymers were obtained (B > 0.65) [6].…”

Section: Results and Discussion 31 Synthesis And Molecular Charactementioning

confidence: 88%

“…The mass loss and derivative of mass loss curves in an air atmosphere are shown in Figure 11. The TGA traces of both homopolymers were found to exhibit two maxima of mass loss in an oxidizing atmosphere, the first major step attributed to the decomposition of polymer backbone (chain scission of the ester bonds) is followed by the minor step, attributed to an oxidative degradation process [43,68]. The PBT/PLA blends decomposition profile exhibit three distinct mass loss steps, two of them in the lower temperature range (300-435°C).…”

Section: Thermal Stabilitymentioning

confidence: 97%

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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: 88%

Section: Thermal Stabilitymentioning

confidence: 97%

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 copolymerization reaction and copolymer structure are controlled by the ratios and reactivity of reagents and catalysts. [14] The photocrosslinking property of polymer is owed to carbon-carbon double bond of α, β-unsaturated carbonyl groups which undergo [2+2] cycloaddition reactions under ultraviolet radiation. [15] Our objective for the synthesis of these eight copolyesters containing chalcone moieties in the main chain is to characterize them and finally studying their biological activities.…”

Section: Research Articlementioning

confidence: 99%

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Rais¹

2018

AJP

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Aim: To synthesise random copolyesters containing chalcone moiety in the main chain, their characterization and biological activity. Material and Methods: A series of eight random copolyesters were synthesized by the polycondensation of a chalcone diol with two aromatic diacid chlorides and four aliphatic diacid chlorides. The two aromatic diacid chlorides used were terephthaloyl chloride and isophthaloyl chloride. The aliphatic diacid chlorides used were adipoyl chloride, oxalyl chloride, glutaryl chloride, and succinyl chloride. The chalcone diol was synthesized by acid catalyzed Claisen-Schmidt reaction. Results and Discussions: These copolyesters were characterized by qualitative solubility tests and viscosity measurements. The microstructure of the repeating units available in the copolyester main chain was established by Fourier transform infrared, 1 H-nuclear magnetic resonance (NMR), and 13 C-NMR spectroscopic techniques. DSC was apply to study thermal analysis. The well diffusion method was employed to establish the biological efficacy of these eight copolyesters by involving Grampositive and Gram-negative bacteria. Conclusion: The presented work reports random copolyester preparation by polycondensation method and viscosity measurements tells about that the prepared compounds are of high molecular weight. others like FTIR, NMR, Solubility measurements and DSC characterize them. Biological properties was also studied.

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“…Such an approach has been used only for PLA reinforced with highly oriented bers of PBS. 10 Our current study focuses on new PLA-based blends namely PLA with novel aliphatic-aromatic copolyesters (PBASGT), synthesized previously, 16 and commercial PBAT. It is attempted to transform the blends to composites by morphology modication in the minor phase from droplets to bers.…”

Section: Introductionmentioning

confidence: 99%

In situgeneration of sustainable PLA-based nanocomposites by shear induced crystallization of nanofibrillar inclusions

et al. 2019

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Classification of aliphatic-butylene terephthalate copolyesters in relation to aliphatic/aromatic ratio

Cited by 20 publications

References 37 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

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In situgeneration of sustainable PLA-based nanocomposites by shear induced crystallization of nanofibrillar inclusions

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