Chain extension and branching of poly(L-lactic acid) produced by reaction with a DGEBA-based epoxy resin

Zhou, Zhiping; Huang, Guangshun; Xu, Weijian; Ren, F. M.

doi:10.3144/expresspolymlett.2007.101

Cited by 37 publications

(31 citation statements)

References 16 publications

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“…Other chain extenders reported in the literature are DGEBA-based resins. Such a selective functionalization has been performed in order to increase the reactivity of specific chain extenders [17,18]. Chain extension of PLA has also been performed by initiating polymerization with either tetrol or hexol.…”

Section: Introductionmentioning

confidence: 99%

Reactive extrusion of PLA, PBAT with a multi-functional epoxide: Physico-chemical and rheological properties

Al-Itry

Lamnawar

Maazouz

2014

European Polymer Journal

192

127

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Section: Introductionmentioning

confidence: 99%

Reactive extrusion of PLA, PBAT with a multi-functional epoxide: Physico-chemical and rheological properties

Al-Itry

Lamnawar

Maazouz

2014

European Polymer Journal

192

127

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“…Carlson et al [18,19] modified PLA using maleic anhydride and a range of alkoxy forming peroxides. Zhou et al [20] obtained a copolymer prepared by chain extension of dicarboxylated PLLA and a diglycidyl ether of bisphenol-A (DGBA) based epoxy resin. Najafi et al [21] prepared PLA-clay nanocomposites using polycarbodiimide, tris(nonyl phenyl) phosphate and Joncryl ADR-4368 as chain extenders.…”

Section: Introductionmentioning

confidence: 99%

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

Hernández-Alamilla

Valadez-González

2015

Journal of Polymer Engineering

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Abstract The effect of two commercial melt strength enhancer additives, Paraloid BPMS-250 (BPMS) and Biostrength 700 (BIOS), on the thermal, rheological and morphological properties of polylactide (PLA) was studied. Thermal analyses showed that both the BPMS and BIOS additives decreased the ability of PLA to crystallize. The rheological tests indicated that zero-shear viscosity and storage modulus of the PLA/BPMS and PLA/BIOS blends were significantly increased with the additive content. These could be attributed to the entanglements between the PLA chains with those of the high molecular weight additive, creating a physical network which reduces the segmental mobility of PLA and improves the melt elasticity of the blend. The entanglement molecular weights (Me) of PLA/BPMS and PLA/BIOS blends were lower than those of unprocessed and processed PLA (Me≈4×104 g/mol), which suggests greater chain entanglements and a higher entanglement density (ve). The elongational viscosity (ηE) and melt strength values were estimated using a screw-extrusion capillary rheometer, where the PLA/BIOS blends presented the highest values. Finally, scanning electron microscopy on the samples was carried out to assess the blend morphology.

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“…The addition of 1 phr (part per hundred part of resin) of DGEBA resulted in a slight increase of torque values, suggesting the presence of some interchain reactions during processing. DGEBA has been reported to be an effective chain extender for PLA . Thus, it can also act as a bridge between PLA and PBAT chains, through the reaction between the epoxy (from DGEBA) and carboxyl groups at the end of PLA and/or PBAT chains, as illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Diglycidyl ether of bisphenol A‐based epoxy resin (DGEBA) has been also tested as chain extender for dicarboxylated PLA . Following this principle, Dong et al reported a comparative study involving the compatibilization of PBAT/PLA (20:80) with multi functional epoxy‐based copolymer or 1,6‐hexanediol diglycidyl ether.…”

Section: Introductionmentioning

confidence: 99%

DGEBA‐Based Epoxy Resin as Compatibilizer for Biodegradable Poly (lactic acid)/Poly(butylene adipate‐co‐terephthalate) Blends

Pereira

Soares

Jesus

et al. 2018

Macromolecular Symposia

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Poly (lactic acid) (PLA) and poly(butylene adipate‐co‐terephthalate) (PBAT) are melt blended in a proportion of 50:50 in the presence of diglycidyl ether of bisphenol A (DGEBA) − based epoxy resin, which plays a role of compatibilizing agent and/or chain extender. The increase of torque values during melt mixing and the molar mass of the polymer in the compatibilized blends suggest that DGEBA acts as a chain extender between the polyesters chains. The blend is immiscible with sea‐island type morphology, as suggested by scanning electron microscopy. The addition of 3 phr of DGEBA results in a decrease of domain size and a better interfacial adhesion, which is also confirmed by rheological behavior. An increase of modulus and tensile strength of the blend is also observed by the addition of 3 phr of DGEBA. Dynamic‐mechanical and thermal properties are also investigated. Therefore, this article provides a new strategy for improving the compatibilization of PLA and PBAT biodegradable polyesters and open new possibilities to develop fully biodegradable polymeric materials.

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Chain extension and branching of poly(L-lactic acid) produced by reaction with a DGEBA-based epoxy resin

Cited by 37 publications

References 16 publications

Reactive extrusion of PLA, PBAT with a multi-functional epoxide: Physico-chemical and rheological properties

Reactive extrusion of PLA, PBAT with a multi-functional epoxide: Physico-chemical and rheological properties

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

DGEBA‐Based Epoxy Resin as Compatibilizer for Biodegradable Poly (lactic acid)/Poly(butylene adipate‐co‐terephthalate) Blends

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