Characterization of poly(lactic acid) enhancement via poly(L-lactic acid)/poly(D-lactic acid) stereocomplexation and its influence on material crystallinity and morphology

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F25%3A00013739" target="_blank" >RIV/46747885:24210/25:00013739 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.polymertesting.2025.108997" target="_blank" >https://doi.org/10.1016/j.polymertesting.2025.108997</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.polymertesting.2025.108997" target="_blank" >10.1016/j.polymertesting.2025.108997</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterization of poly(lactic acid) enhancement via poly(L-lactic acid)/poly(D-lactic acid) stereocomplexation and its influence on material crystallinity and morphology

Popis výsledku v původním jazyce

Poly(lactic acid) (PLA) is a biobased, biodegradable material that has shown great potential as an alternative to fossil-based polymers, already used in various fields due to its biocompatibility and advantageous physico-chemical properties. However, PLA lacks the thermal stability and impact resistance needed for engineering applications. To this end, the current study proposes a solvent-free methodology for the physical preparation of a PLA stereocomplex (PLA-SC) between enantiomeric poly(D-lactic acid) and poly(L-lactic acid), and its use in small amounts as a self-nucleating agent. The strength of the internal hydrogen-bonding (−CH3 … O=C) within the stereocomplex crystallites was altered by applying three threshold extrusion temperatures, and its influence on crystallinity and morphology was investigated. The crystallinity of PDLLA showed a sixfold increase with the addition of PLA-SC, while the crystallinity of PLLA doubled, as indicated by differential scanning calorimetry (DSC) and corroborated by Raman spectroscopy. The self-nucleation effect of the stereocomplex was observed under polarized optical light microscopy (POM). Atomic force microscopy (AFM) revealed two distinct morphologies correlated to the crystallinity trends recorded, namely spherulites and shish-kebabs, the latter being known as flow-induced, oriented semi-crystalline conformations. The intrinsic crystallization kinetics of each matrix promoted lamellar or fibrillar packing, respectively. The heat deflection temperatures (HDT) also increased with an increase in PLA-SC content for both PDLLA and PLLA matrices. Incorporating very low amounts of PLA-SC into PLA matrices of different optical purities under industrial processing conditions enhanced material properties, crucial for widening the applicability of this bioplastic.

Název v anglickém jazyce

Characterization of poly(lactic acid) enhancement via poly(L-lactic acid)/poly(D-lactic acid) stereocomplexation and its influence on material crystallinity and morphology

Popis výsledku anglicky

Poly(lactic acid) (PLA) is a biobased, biodegradable material that has shown great potential as an alternative to fossil-based polymers, already used in various fields due to its biocompatibility and advantageous physico-chemical properties. However, PLA lacks the thermal stability and impact resistance needed for engineering applications. To this end, the current study proposes a solvent-free methodology for the physical preparation of a PLA stereocomplex (PLA-SC) between enantiomeric poly(D-lactic acid) and poly(L-lactic acid), and its use in small amounts as a self-nucleating agent. The strength of the internal hydrogen-bonding (−CH3 … O=C) within the stereocomplex crystallites was altered by applying three threshold extrusion temperatures, and its influence on crystallinity and morphology was investigated. The crystallinity of PDLLA showed a sixfold increase with the addition of PLA-SC, while the crystallinity of PLLA doubled, as indicated by differential scanning calorimetry (DSC) and corroborated by Raman spectroscopy. The self-nucleation effect of the stereocomplex was observed under polarized optical light microscopy (POM). Atomic force microscopy (AFM) revealed two distinct morphologies correlated to the crystallinity trends recorded, namely spherulites and shish-kebabs, the latter being known as flow-induced, oriented semi-crystalline conformations. The intrinsic crystallization kinetics of each matrix promoted lamellar or fibrillar packing, respectively. The heat deflection temperatures (HDT) also increased with an increase in PLA-SC content for both PDLLA and PLLA matrices. Incorporating very low amounts of PLA-SC into PLA matrices of different optical purities under industrial processing conditions enhanced material properties, crucial for widening the applicability of this bioplastic.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Polymer Testing>

ISSN

0142-9418

e-ISSN

—

Svazek periodika

152

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

108997

Kód UT WoS článku

001595082000001

EID výsledku v databázi Scopus

2-s2.0-105017969627