How latex film formation and adhesion at the nanoscale correlate to performance of pressure sensitive adhesives with cellulose nanocrystals

Kuvaus

Emulsion polymerized latex-based pressure sensitive adhesives (PSAs) are more environmentally benign because they are synthesized in water but often underperform compared to their solution polymerized counterparts. Studies have shown a simultaneous improvement in the tack, and peel and shear strength of various acrylic PSAs upon the addition of cellulose nanocrystals (CNCs). This work uses atomic force microscopy (AFM) to examine the role of CNCs in (i) the coalescence of hydrophobic 2‐ethyl hexyl acrylate/n‐butyl acrylate/methyl methacrylate (EHA/BA/MMA) latex films, and (ii) as adhesion modifiers over multiple length scales. EHA/BA/MMA. Thin films with varying solids content and CNC loading were prepared by spin coating. AFM revealed that CNCs lowered the solids content threshold for latex particle coalescence during film formation. This improved the cohesive strength of the films, which was directly reflected in the increased shear strength of the EHA/BA/MMA PSAs with increasing CNC loading. Colloidal probe AFM indicated that the nano-adhesion of thicker continuous latex films increased with CNC loading when measured over small contact areas where the effect of surface roughness was negligible. Conversely, the beneficial effects of the CNCs on macroscopic PSA tack and peel strength were outweighed by the effects of increased surface roughness with increasing CNC loading over larger surface areas. This highlights that CNCs can improve both cohesive and adhesive PSA properties, however, the effects are most pronounced when the CNCs interact favorably with the latex polymer and are uniformly dispersed throughout the adhesive film.,MFP-3D Atomic Force Microscope (Asylum Research – Oxford Instruments, Santa Barbara, CA, USA) Igor Pro 6.0 running Asylum Research AFM software (version 13.17),
Näytä enemmän

Julkaisuvuosi

2021

Aineiston tyyppi

Tekijät

Department of Bioproducts and Biosystems

Alexandra Ouzas - Tekijä

Carole Fraschini - Tekijä

Emily D. Cranston - Tekijä

Marc A. Dubé - Tekijä

Richard M. Berry - Tekijä

Elina Niinivaara Orcid -palvelun logo - Muu tekijä

Dryad Digital Repository - Julkaisija

Projekti

Muut tiedot

Tieteenalat

Nanoteknologia

Kieli

Saatavuus

Avoin

Lisenssi

Creative Commons Yleismaailmallinen (CC0 1.0) Public Domain lausuma

Avainsanat

Asiasanat

Ajallinen kattavuus

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