Polymer Interdiffusion vs Cross-Linking in Carboxylic Acid−Carbodiimide Latex Films

1999 ◽  
Vol 32 (22) ◽  
pp. 7692-7695 ◽  
Author(s):  
Hung H. Pham ◽  
Mitchell A. Winnik
Keyword(s):  
Carboxylic Acid ◽  
Cross Linking ◽  
Latex Films ◽  
Polymer Interdiffusion

scholarly journals Formation of Amphiphilic Molecules from the Most Common Marine Polysaccharides, toward a Sustainable Alternative?

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4445
Author(s):  
Tiphaine Wong ◽  
Lorette Brault ◽  
Eric Gasparotto ◽  
Romuald Vallée ◽  
Pierre-Yves Morvan ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Carboxylic Acid ◽  
Bioactive Compounds ◽  
Biological Properties ◽  
Cross Linking ◽  
Structural Modifications ◽  
Chemical Structures ◽  
Amphiphilic Molecules

Marine polysaccharides are part of the huge seaweeds resources and present many applications for several industries. In order to widen their potential as additives or bioactive compounds, some structural modifications have been studied. Among them, simple hydrophobization reactions have been developed in order to yield to grafted polysaccharides bearing acyl-, aryl-, alkyl-, and alkenyl-groups or fatty acid chains. The resulting polymers are able to present modified physicochemical and/or biological properties of interest in the current pharmaceutical, cosmetics, or food fields. This review covers the chemical structures of the main marine polysaccharides, and then focuses on their structural modifications, and especially on hydrophobization reactions mainly esterification, acylation, alkylation, amidation, or even cross-linking reaction on native hydroxyl-, amine, or carboxylic acid functions. Finally, the question of the necessary requirement for more sustainable processes around these structural modulations of marine polysaccharides is addressed, considering the development of greener technologies applied to traditional polysaccharides.

Rheology of latex films bonded to wood: influence of cross-linking

Holzforschung ◽  
2006 ◽  
Vol 60 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Francisco López-Suevos ◽  
Charles E. Frazier
Keyword(s):  
Phenol Formaldehyde ◽  
Adhesive Layer ◽  
Wood Adhesive ◽  
Water Soluble ◽  
Cross Linking ◽  
Sample Type ◽  
Master Curves ◽  
Latex Films ◽  
Adhesive Interaction ◽  
Tan Δ

Abstract Parallel-plate rheological analysis was conducted on two types of cross-linking poly(vinyl acetate) latex films: dry freestanding films, and dry films bonded directly to wood (composites). For each sample type, three levels of cross-linking were used: (1) little or no cross-linking of unaltered latex; (2) substantial cross-linking through AlCl3 catalysis of N-methylolacrylamide co-monomer; and (3) greater cross-linking from a phenol-formaldehyde resol additive, in addition to AlCl3 catalysis. Simple thermal scans revealed a strong wood/adhesive interaction; wood increased the base polymer T g by ∼5°C in all adhesives. Relative to the simple thermal scans, time-temperature master curves provided more insight and information about the wood/adhesive interaction. Storage modulus and tan δ master curves both indicated that wood retarded adhesive cross-linking. Using time-temperature superposition, a segmental coupling analysis demonstrated that wood actually narrowed the breadth of the glass transition, or reduced segmental coupling. Cross-linking influenced segmental coupling, but in a fashion that was dependent on the presence or absence of wood. Wood-induced reductions in cross-linking and in segmental coupling were attributed to the diffusion of water-soluble reactive compounds away from the adhesive layer and into the bulk wood. Time/temperature equivalence provides a sensitive means to detect interactions between wood and viscoelastic adhesives.

Suspension cross-linking of poly(aryl ether ketone)s containing carboxylic acid functionality

2001 ◽  
Vol 11 (3) ◽  
pp. 736-740 ◽  
Author(s):  
Robert A. Hunter ◽  
Peter D. Turner ◽  
Stephen Rimmer
Keyword(s):  
Carboxylic Acid ◽  
Cross Linking ◽  
Aryl Ether ◽  
Aryl Ether Ketone ◽  
Ether Ketone

Influence of intraparticle cross-linking on polymer diffusion in latex films prepared from secondary dispersions

2022 ◽  
Vol 164 ◽  
pp. 106691
Author(s):  
Yang Liu ◽  
Kenneth Tran ◽  
Kevin Ho ◽  
Jessica Emsermann ◽  
Margaret Zhang ◽  
...  
Keyword(s):  
Cross Linking ◽  
Polymer Diffusion ◽  
Latex Films

Interdiffusion and Self-Cross-Linking in Acetal-Functionalized Latex Films

2004 ◽  
Vol 37 (16) ◽  
pp. 6141-6152 ◽  
Author(s):  
Florence Mazuel ◽  
Chuong Bui ◽  
Bernadette Charleux ◽  
Eva Cabet-Deliry ◽  
Mitchell A. Winnik
Keyword(s):  
Cross Linking ◽  
Latex Films
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