Processing stabilization of poly(3-hydroxybutyrate)/poly(lactic acid) blends with oligomeric carbodiimide

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F19%3APU130250" target="_blank" >RIV/00216305:26310/19:PU130250 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.scientific.net/MSF.955.7" target="_blank" >https://www.scientific.net/MSF.955.7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/MSF.955.7" target="_blank" >10.4028/www.scientific.net/MSF.955.7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Processing stabilization of poly(3-hydroxybutyrate)/poly(lactic acid) blends with oligomeric carbodiimide

Popis výsledku v původním jazyce

Reactivity of five reactive agents with two biopolyesters, poly(3-hydroxybutyrate) (PHB) and poly(lactic acid) (PLA), was studied in situ during processing in laboratory kneader with simultaneous recording of a melt torque. Among them only Raschig, an oligomeric carbodiimide based additive, was proven to enhance melt viscosity of both. In order to find out the most efficient level of this additive for stabilizing of both polymers and PHB/PLA (70/30 w/w) blend, different concentrations were studied by means of melt torque monitoring, rheology time tests and gel permeation chromatography. Results showed the same trend for neat polymers and their blend. Addition of more than 0.5 % wt. did not have any further positive effect on molecular weight or complex viscosity of the melt. Higher amount is not consumed during the reaction and is left in the sample. Therefore, this amount was used for processing stability studies on PHB/PLA blends by subsequent extrusion cycles. Melt volume-flow rate of extruded samples was obtained and results showed lower values for all stabilized blends comparing to the first extrusion sample of non-stabilized blend. At the same, stability of the blends is secured up to the third extrusion cycle.

Název v anglickém jazyce

Processing stabilization of poly(3-hydroxybutyrate)/poly(lactic acid) blends with oligomeric carbodiimide

Popis výsledku anglicky

Reactivity of five reactive agents with two biopolyesters, poly(3-hydroxybutyrate) (PHB) and poly(lactic acid) (PLA), was studied in situ during processing in laboratory kneader with simultaneous recording of a melt torque. Among them only Raschig, an oligomeric carbodiimide based additive, was proven to enhance melt viscosity of both. In order to find out the most efficient level of this additive for stabilizing of both polymers and PHB/PLA (70/30 w/w) blend, different concentrations were studied by means of melt torque monitoring, rheology time tests and gel permeation chromatography. Results showed the same trend for neat polymers and their blend. Addition of more than 0.5 % wt. did not have any further positive effect on molecular weight or complex viscosity of the melt. Higher amount is not consumed during the reaction and is left in the sample. Therefore, this amount was used for processing stability studies on PHB/PLA blends by subsequent extrusion cycles. Melt volume-flow rate of extruded samples was obtained and results showed lower values for all stabilized blends comparing to the first extrusion sample of non-stabilized blend. At the same, stability of the blends is secured up to the third extrusion cycle.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/LO1211" target="_blank" >LO1211: Centrum materiálového výzkumu na FCH VUT v Brně - udržitelnost a rozvoj</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Science Forum

ISSN

1662-9752

e-ISSN

—

Svazek periodika

955

Číslo periodika v rámci svazku

2019

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

6

Strana od-do

7-12

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85071032315