Effect of propyleneimine external cross-linker on the properties of acrylate latex pressure sensitive adhesives. (September 2015)

• Record Type: Journal Article
• Authors: Fang, Cheng; Lin, Zhongxiang
• Is Part Of: International journal of adhesion & adhesives. Volume 61(2015:Sep.)
• Page Start: 1
• Page End: 7
• Publication Date: 2015-09
• Subjects: Pressure sensitive adhesive -- Emulsion polymerization -- External cross-linker -- Adhesive property -- Acrylate latex polymer; Adhesion -- Periodicals; Adhesives -- Periodicals; Adhésion (Physique) -- Périodiques; Adhésifs -- Périodiques; Adhesie; Kleefstoffen; Adhesion; Adhesives; Periodicals; 668.3
• DOI: 10.1016/j.ijadhadh.2015.04.009
• Languages: English
• ISSNs: 0143-7496

Abstract

Abstract: Acrylate pressure sensitive adhesive (PSA) latexes were synthesized via a starved monomer seeded semi-batch emulsion polymerization process with butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA) and 2-hydroxyethyl acrylate (HEA). These PSA polymers were then cross-linked with trifunctional propyleneimine external cross-linker (SAC-100) to study the cross-linking reaction between carboxylic group of the polymer chain and cross-linking agent. It was found that cross-linking provided a significant influence on the film formation process based on the result of SEM analysis. In addition, with the increase of SAC-100 content, the gel content of the polymer increased significantly, while molecular weight between cross-link points ( M c ) and the sol molecular weight ( M w, M n ) of the polymer decreased remarkably. The TGA result showed that the addition of the external cross-linker can enhance the thermal stability of the latex film. Moreover, for the cross-linked adhesive film, the shear strength was improved greatly while at the sacrifice of loop tack and peel strength, when compared with the uncross-linked counterparts. Besides, dynamic mechanical analysis (DMA) was also used to evaluate the viscoelastic properties of the acrylate emulsion PSA film.