Open AccessNucleation modalities in poly(lactide), poly(butylene succinate), and poly(ε‐caprolactone) ternary blends with partial wetting morphology
Author(s) -
Fenni Seif Eddine,
Wang Jun,
Haddaoui Nacerddine,
Favis Basil D.,
Müller Alejandro J.,
Cavallo Dario
Publication year - 2020
Publication title -
polymer crystallization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.443
H-Index - 9
ISSN - 2573-7619
DOI - 10.1002/pcr2.10145
Subject(s) - materials science , nucleation , crystallization , differential scanning calorimetry , wetting , chemical engineering , phase (matter) , ternary operation , polymer , morphology (biology) , polymer chemistry , optical microscope , scanning electron microscope , composite material , chemistry , organic chemistry , thermodynamics , physics , genetics , biology , computer science , engineering , programming language
Ternary biodegradable polymer blends of poly(lactic acid) (PLA), poly(butylene succinate) (PBS), and poly(ε‐caprolactone) (PCL) with the composition 45/10/45 wt% and exhibiting partial‐wetting morphology were prepared. In this morphology, the minor phase is present as self‐assembled droplets at the co‐continuous interface of the other two major phases. The crystallization of the components in the various blends was thoroughly investigated. Differential scanning calorimetry highlighted minor differences in the overall kinetics of a given component in the ternary blend, with respect to the neat polymer. On the other hand, several unusual nucleation mechanisms could be studied by polarized optical microscopy (PLOM). With reference to the major phases, PLA spherulites displayed surface‐induced nucleation from the interface with molten PBS or PCL droplets. On lowering the crystallization temperature, the PBS phase effectively nucleated at the interface with previously crystallized PLA domains, forming a transcrystalline morphology. Concerning the minor phase, weak partial‐wetting PBS droplets displayed a droplet‐to‐droplet percolation of the nucleation events. Strongly partial‐wetting PCL droplets were confined between previously crystallized PLA and PBS co‐continuous phases and, instead, solidified as isolated domains randomly in space. This work provides further insights in the relationship between morphology and crystallization in immiscible ternary blends.