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

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... Full description

Contained in: Journal of Polymer Engineering (Online) Vol. 36, No. 1 (2016), p. 31-41
Journal Title: Journal of Polymer Engineering (Online)
Fulltext access:
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Links: Additional Link (dx.doi.org)
ISSN: 2191-0340
Additional Keywords: ADDITIV
BEWEGLICHKEIT
DEHNUNGSVISKOSITAET
ELASTIZITAET
ELEKTRONENMIKROSKOPIE
FLACHKANALRHEOMETER
MOLARE-MASSE
POLYMILCHSAEURE
SCHRAUBE
STOFFGEMISCH
THERMOANALYSE
DOI: 10.1515/polyeng-2014-0322
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 11 Seiten, 55 Quellen
ID (e.g. DOI, URN): 10.1515/polyeng-2014-0322
PPN (Catalogue-ID): WTI000339539
Note: WTI TEMA DB
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520 |a 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. [Walter de Gruyter GmbH. Reproduced with permission.] 
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