Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evaporation Induced Crystal Nucleation and Morphology of Dried Poly (Vinylidene Fluoride) Droplets

Version 1 : Received: 26 October 2021 / Approved: 28 October 2021 / Online: 28 October 2021 (09:55:59 CEST)

A peer-reviewed article of this Preprint also exists.

Liang, Y.; Wang, S. Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets. Crystals 2021, 11, 1442. Liang, Y.; Wang, S. Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets. Crystals 2021, 11, 1442.

Journal reference: Crystals 2021, 11, 1442
DOI: 10.3390/cryst11121442

Abstract

The evaporation of polymer solution droplet is an important in solution-based polymer film fabrications, such as inkjet print, spray coatings, and droplet casting etc. In this work, we investigated the effect of droplet size, solvent evaporation rate, and concentration on “coffee-ring” effect, crystal nucleation, polymorphism, and morphology of dried poly (vinylidene fluoride) (PVDF) solution droplets with atomic force microscopy (AFM) method. We found that the crystal structure, morphology and crystal distribution in the center and edge regions of dried PVDF droplets were different due to “coffee-ring” effect. The “coffee-ring” effect of dried PVDF droplets was mainly composited of accumulated crystals at the edge region of droplet, which was mainly made by crystallization of migrated chains. The interplay between migration of chains, crystallization and solidification of PVDF droplets significantly influenced the formation of “coffee-ring”. In addition, our results showed that the decrease of droplet size and controlling solvent evaporation rate were effective ways to improve the PVDF β-phase nucleation and decrease crystal size.

Keywords

evaporation; poly (vinylidene fluoride); crystallization; droplet; coffee ring effect; ultrasonic spray

Subject

MATERIALS SCIENCE, Polymers & Plastics

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