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Improvement of mechanical properties of polylactide by equal channel multiple angular extrusion
Author(s) -
Vozniak Iurii,
Beloshenko Victor,
Savchenko Bogdan,
Voznyak Andrej
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49720
Subject(s) - materials science , toughness , crystallinity , ultimate tensile strength , composite material , extrusion , ductility (earth science) , modulus , thermal stability , izod impact strength test , creep , chemical engineering , engineering
The combination of high strength and toughness is always the goal of high‐performance polymer materials for industrial use. This study addresses the potentialities of a solid state equal‐channel multiple‐angular extrusion (ECMAE) in production of polylactide (PLA) with simultaneous improvement in toughness, strength, and thermal stability. Chain extender Joncryl was used to form PLA with different chain length and morphology (linear or branched PLA). It is demonstrated that simple shear deformation implemented in ECMAE results in formation of an orientation order, an increase in the degree of crystallinity, and the creation of α crystals with an increased degree of perfection. The value of the effects achieved depends on the type of PLA morphology. The best result is observed in the case of linear PLA. ECMAE‐modified linear PLA possess the better combination of strength, modulus, and ductility than the branched one. Compared with neat linear PLA, ECMAE‐modified linear PLA shows 12%, 26%, 217%, and 40% increase in tensile strength, Young's modulus, strain at break and impact strength, respectively. Additionally, the storage modulus shows an improved thermal stability of ECMAE‐modified PLA.