Interfacial stability of compatibilizers dictated by the thermodynamic interactions in an immiscible system and the effects of micelles on the crystallization of PLLA

Abstract

Additional supporting information may be found in the online version of this article.

Stable Co-Continuous PLA/PBAT Blends Compatibilized by Interfacial Stereocomplex Crystallites: Toward Full Biodegradable Polymer Blends with Simultaneously Enhanced Mechanical Properties and Crystallization Rates

“…This was consistent with previous studies where the crystallization of polymer components was inevitably constrained due to the in situ grafting reaction during reactive blending. 30,31 The diffraction peaks of DSB- blends turned quite different. As shown, three visible characteristic peaks at around 12.0°, 20.9°, and 24.0°, which were ascribed to the (110), (300)/(030), and (220) planes of SC-PLAs, were observed (curve v).…”

“…As reported massively, the co-continuous structure demonstrates superior capacity in integrating characteristics impossible to achieve from traditional “sea-island” polymer blends. − It is particularly desirable to make PLA/PBAT blends with a finely dispersed co-continuous morphology, especially in a nanometer scale, for the synergetic enhancement of overall performance. (b) In the current investigations, significant improvement in mechanical properties is usually accompanied with the sacrificing of crystallization in PLA, resulting from the limited mobility of PLA chains after the in situ grafting reaction through reactive blending. , This is undesirable in several cases, especially at which the efficient injection molding procedure is required. It remains a challenge to fabricate super-tough PLA/PBAT blends with a simultaneous acceleration of matrix crystallization via the conventional processing technology.…”

“…(b) In the current investigations, significant improvement in mechanical properties is usually accompanied with the sacrificing of crystallization in PLA, resulting from the limited mobility of PLA chains after the in situ grafting reaction through reactive blending. 30,31 This is undesirable in several cases, especially at which the efficient injection molding procedure is required. It remains a challenge to fabricate super-tough PLA/PBAT blends with a simultaneous acceleration of matrix crystallization via the conventional processing technology.…”

Two antagonistic effects of flow/mixing on reactive polymer blending

“…It consists in blending two (or more) polymers in a mixer (often a twin screw extruder) while forming a copolymer (a compatibilizer) between reactive groups of the polymer components at the interfaces which promotes the dispersion of one polymer in the other and stabilizes the resulting morphology 2–4 . Such a process should meet two requirements in order to be successful: it allows for the formation of a sufficient amount of the copolymer at the interfaces within the residence time of the mixer (on the order of a minute in a twin screw extruder), and the copolymer formed at the interfaces permanently stays there during the entire blending process 5–8 . Flow/mixing plays a key role in this process as it promotes the formation of the copolymer by generating/renewing the interfaces and enhancing the collisions between the reactive groups 9,10 .…”

Sustainable and high‐performance ternary blends from polylactide, CO2‐based polyester and microbial polyesters with different chemical structure

“…One problem is the poor miscibility of PLA or PHAs with other biobased polyesters, which was pursued to be resolved by adding copolymer compatibilizer or reactive compatibilization. 11,[20][21][22] However, these compatibilizing methods usually are complicated, resulting in further increasing the cost.…”