ArticleLangmuir : the ACS journal of surfaces and colloids2026
Shear-Induced Evolution of Cellular Structure and Thermo-Mechanical Properties in PLA/HNC and In-situ Fibrillated PLA/PTFE Composite Foams.
Article in Langmuir : the ACS journal of surfaces and colloids, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
High-performance cellular biopolymeric foams require precise control of processing and filler-induced microstructure. In this study, poly(lactic acid) (PLA) composite foams with halloysite nanoclay (HNC) and polytetrafluoroethylene (PTFE) were produced via twin-screw extrusion foaming using azodicarbonamide. The effect of screw speed (20-120 rpm) on morphology, crystallization, and compressive properties was investigated. In PLA/HNC, increasing screw speed improved filler dispersion and heterogeneous nucleation, reducing cell size by ∼50-60% and yielding a maximum void fraction of ∼20.5% at 60 rpm. In contrast, PLA/PTFE exhibited complete in situ fibrillation into a three-dimensional nanofibrillar network (∼100-500 nm), whose density increased continuously with screw speed without saturation. PLA/PTFE showed over a 20-fold reduction in crystallization half-time of PLA at 130 °C (vs ∼4-fold for HNC) due to its high nucleation surface area. It also achieved superior compressive performance (∼68-70 MPa·cm3/g strength and ∼11 J/g toughness at 120 rpm), exceeding PLA/HNC by ∼50% and ∼80%, respectively, through fibril-driven reinforcement mechanisms of cell walls.
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