Author
Smita V. Mankar
Bio: Smita V. Mankar is an academic researcher from Lund University. The author has contributed to research in topics: Polyester & Pentaerythritol. The author has an hindex of 2, co-authored 5 publications receiving 44 citations.
Topics: Polyester, Pentaerythritol, Glass transition, Diol, Monomer
Papers
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TL;DR: In this article, a diol with a spirocyclic acetal structure was synthesized, which showed improved glass transition temperature and thermal stability upon the incorporation of the spiro-acetal units.
Abstract: Bio-based rigid diols are key building blocks in the development and preparation of high performance bioplastics with improved thermal and dimensional stability. Here, we report on the straightforward two-step synthesis of a diol with a spirocyclic acetal structure, starting from bio-based vanillin and pentaerythritol. According to a preliminary life cycle assessment (LCA), the greenhouse gas emissions of this bio-based diol are significantly lower than that of bio-based 1,3-propanediol. Copolymerization of the rigid spiro-diol with 1,6-hexanediol and dimethyl terephthalate by melt polymerization yielded a series of copolyesters, which showed improved glass transition temperature and thermal stability upon the incorporation of the spiro-acetal units. The crystallinity and melting point of copolyesters decreased with increasing content of the spirocyclic backbone structures. The copolyesters containing 10% of the new diol was semicrystalline while those with 20 and 30% spiro-diol incorporated were completely amorphous. Moreover, dynamic mechanical analysis indicated that the copolyesters showed comparable storage moduli as AkestraTM, a commercial fossil-based high-performance polyester.
43 citations
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TL;DR: In this article, a rigid diol with a spirocyclic structure via a one-step acid-catalyzed acetalation of fructose-sourced 5-hydroxymethylfurfural and pentaerythritol was reported.
41 citations
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TL;DR: In this paper, a rigid spirocyclic diester monomer was used to produce polyesters and copolyesters with glass transition temperatures in the range 12-49 °C and thermal stability up to 300 °C.
7 citations
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TL;DR: A rigid diol with a cyclic acetal structure was synthesized by facile acetalation of fructose-based 5-hydroxymethyl furfural (HMF) and partly bio-based di-trimethylolpropane (di-TMP) as discussed by the authors.
7 citations
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TL;DR: Sustainable low melting temperature bicomponent polyester fibers that can be circularly recycled were developed in this article, where potentially biobased poly(hexamethylene terephthalate) (PHT) acting as the low...
Abstract: Sustainable low melting temperature bicomponent polyester fibers that can be circularly recycled were developed. The potentially biobased poly(hexamethylene terephthalate) (PHT), acting as the low ...
6 citations
Cited by
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141 citations
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TL;DR: A review on the recent advances in the field of bio-based polyesters is presented in this paper, where the authors present the common challenges faced by bio-polyester elastomers and the prospects for future development.
102 citations
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TL;DR: In this article, a review of existing life cycle assessment (LCA) and technoeconomic analysis (TEA) studies of 5-Hydroxymethylfurfural (HMF) and 2,5-furandicarboxylic acid (FDCA) is presented.
79 citations
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TL;DR: The present review covers the most significant contributions that appeared in the time span January 2015-August 2019, describing the sustainable catalytic synthesis of rigid diols from biomass derivatives, and focuses on heterogeneous catalysis, use of green solvents and mild conditions, cascade processes in one-pot, and continuous flow setups.
Abstract: Bisphenol A is an oil-derived, large market volume chemical with a wide spectrum of applications in plastics, adhesives and thermal papers. However, bisphenol A is not considered safe due to its endocrine disrupting properties and reproductive toxicity. Several functional substitutes of bisphenol A have been proposed in the literature, produced from plant biomass. Unless otherwise specified, the present review covers the most significant contributions that appeared in the time span January 2015-August 2019, describing the sustainable catalytic synthesis of rigid diols from biomass derivatives. The focus is thereupon on heterogeneous catalysis, use of green solvents and mild conditions, cascade processes in one-pot, and continuous flow setups. More than 500 up-to-date references describe the various substitutes proposed and the catalytic methods for their manufacture, broken down according to the main biomass types from which they originate.
67 citations
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TL;DR: Lignin in advanced energy applications: source, extraction methodology, structure/property relationships as mentioned in this paper , Lignin extraction methodolgy, structure and property relationships, etc.
62 citations