Microgel Adhesives for Wet Cellulose: Measurements and Modeling

Wen, Quan; Pelton, Robert

doi:10.1021/la2050493

Cited by 14 publications

(35 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Finally, from a mechanistic perspective, the reduced microgels represent a limiting case of near zero cross-link density when considering the influence of microgel cross-linking on adhesion. Based on our previous modeling, supported by experiments, we argued that the delamination force increases with decreasing cross-link density. , This is because only a narrow band of microgels near the peel front support the peeling load, see Figure . The width of this band increases with increasing microgel extensibility, resulting in more microgels sharing the load.…”

Section: Discussionmentioning

confidence: 67%

“…In this work, we have chosen poly( N -isopropylacrylamide) (PNIPAM) copolymer microgels as degradable supporting particles because we have much experience controlling their properties. For example, we have shown that commercial polyvinylamine (PVAm) strongly adsorbs onto nonlabile, PNIPAM carboxylated microgels . The PVAm coated microgels function as good wet cellulose adhesives, particularly with rough cellulose surfaces where coated microgels give much thicker adsorbed layers resulting in better contact between two rough surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…For example, we have shown that commercial polyvinylamine (PVAm) strongly adsorbs onto nonlabile, PNIPAM carboxylated microgels. 8 The PVAm coated micro- gels function as good wet cellulose adhesives, particularly with rough cellulose surfaces where coated microgels give much thicker adsorbed layers resulting in better contact between two rough surfaces. Thus, the microgels are good model particles for mechanistic studies.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Degradable Microgel Wet-Strength Adhesives: A Route to Enhanced Paper Recycling

Yang

Pelton

2017

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Demonstrated is a new approach to cellulose fiber-based materials that are strong when wet, yet can be recycled after exposure to a weak reducing agent. Poly(N-isopropylacrylamide-co-acrylic acid) microgels were transformed into wet cellulose adhesives by incorporation of hydrazide groups that can form hydrazone linkages to oxidized cellulose. Reductant responsivity was obtained by introducing cleavable disulfide linkages, either in the chains tethering the adhesive hydrazide groups, or by using disulfide cross-links in the microgels. Both types of disulfide derivatives gave about 75% reduction in cellulose wet adhesion after exposure to a reductant. Truly sustainable wood-fiber replacements for plastic packaging must be insensitive to water while being fully recyclable; this work demonstrates two routes to reversible wet cellulose adhesives, facilitating recycling.

show abstract

Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradable Microgel Wet-Strength Adhesives: A Route to Enhanced Paper Recycling

Yang

Pelton

2017

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Finally, for more academic and mechanistic studies, wet-peeling has proved to be useful in evaluating more exotic joint structures such as layer-by-layer (Feng et al 2009), microgels (Wen and Pelton 2012), and colloidal polyelectrolyte complexes (Feng et al 2007b).…”

Section: Discussionmentioning

confidence: 99%

Wet-peel: a tool for comparing wet-strength resins

Yang

DiFlavio²,

Gustafsson

et al. 2018

Nordic Pulp &Amp; Paper Research Journal

Self Cite

View full text Add to dashboard Cite

We propose that a testing procedure we call wet-peel significantly augments conventional wet paper testing when comparing wet-strength resin efficacy or the influence wood pulp fiber surface treatments on wet paper strength. A thin layer of wet-strength resin is sandwiched between a pair of thin, wet regenerated cellulose membranes to form a laminate, which is a physical model for fiber-fiber joints in paper. In the wet-peel method, the ninety-degree wet-delamination force gives a direct measure of adhesion in the wet cellulose-cellulose joint. Wet-peel measurements offer: 1) comparisons of wet-strength polymers at the same content of polymer in the laminate joint without the influences of varying fines contents, formation or paper density; 2) measurements of both the wet-strength of cured, dried joints, and the strength of never-dried joints (i. e. analogous to wet-web strength); 3) demonstrations of the influence of fiber surface chemistry modifications including oxidation and the presence of firmly bound polymers; and, 4) the evaluation of more exotic joint structures including layer-by-layer assemblies, microgels and colloidal polyelectrolyte complexes.

show abstract

“…[25][26][27][28][29] A number of groups have studied MG particles in the presence of polyelectrolytes. [30][31][32][33][34] Diez-Pascual and Wong 31 studied anionic poly(N-isopropylacrylamide-co-methacrylic acid) (PNIPAM-co-MAA) MGs and deposited layers of polycation or polyanion to build up polyelectrolyte layers on their particles. Kleinen et al 23,32,35 studied the binding of poly(diallydimethylammoniumchloride) (PDADMAC) to PNIPAM-co-MAA MGs.…”

Section: Introductionmentioning

confidence: 99%

Doubly crosslinked microgel–polyelectrolyte complexes: three simple methods to tune and improve gel mechanical properties

Liu

Saunders

Freemont³

et al. 2012

Soft Matter

View full text Add to dashboard Cite

Doubly crosslinked microgels (DX MGs) are hydrogels composed of covalently interlinked microgels.They are injectable and have potential application in soft tissue repair. Simple methods for tuning their mechanical properties are required. Here, we investigate the effect of added polyelectrolyte (polycations or a polyanion) as well as NaCl on the mechanical properties of the gels for the first time. Addition of polycations improved ductility and decreased the storage modulus (G 0 ) of the DX MG-polyelectrolyte complex (DX MG-PECs) gels. The best DX MG-PEC gel had a yield strain (g c ) of 109%, which is the highest reported to date for any DX MG. Furthermore, our DX MG-PEC gels were robust and maintained high G 0 values as well as good ductility when swollen at pH ¼ 7.5. The DX MG-PEC gels with improved ductility contained less than 10% polycation. We also investigated the effect of addition of NaCl solution during DX MG and DX MG-PEC preparation. This caused remarkable increases in both G 0 and ductility. The best gel had a G 0 of 300 kPa which is the highest elasticity reported for a DX MG to date. Addition of linear polyacrylic acid during DX MG preparation also increased the G 0 values. This study has provided three new simple methods for tuning the mechanical properties of DX MGs Because the MGs used here belong to a broad class of polymer colloids the results obtained in this study should be generally applicable.

show abstract

Microgel Adhesives for Wet Cellulose: Measurements and Modeling

Cited by 14 publications

References 25 publications

Degradable Microgel Wet-Strength Adhesives: A Route to Enhanced Paper Recycling

Degradable Microgel Wet-Strength Adhesives: A Route to Enhanced Paper Recycling

Wet-peel: a tool for comparing wet-strength resins

Doubly crosslinked microgel–polyelectrolyte complexes: three simple methods to tune and improve gel mechanical properties

Contact Info

Product

Resources

About