IMAGING SCIENCE AND PHOTOCHEMISTRY ›› 2022, Vol. 40 ›› Issue (5): 1004-1009.DOI: 10.7517/issn.1674-0475.220601

• Review and Articles • Previous Articles     Next Articles

Acetylene Functionalized Photo-curable Acrylic Pressure Sensitive Adhesives

YAN Hongyu1, ZHANG Zhengyuan1, WANG Yuechuan1,2   

  1. 1. College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, P. R. China;
    2. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, P. R. China
  • Received:2022-06-13 Published:2022-09-13

Abstract: Photocuring is an effective way to achieve solvent-free and high-performance acrylate pressure-sensitive adhesives. With ethynyl cyclohexyl acrylate (ECA) as the alkyne functional monomer and using its photopolymerization characteristics, solvent-free and gel-free syrup and their final acrylate pressure-sensitive adhesive are prepared in two steps by photocuring the syrup prepared by bulk photopolymerization. With the increase of ECA addition (0~3 mol%), the molecular weights of the polymers containing the retained acetylene groups in the precursors decreased from 55.59×104 Da to 14.12×104 Da and molecular weight distribution slightly increased. Comparative studies have shown that acetylene groups improve the dynamic and static shear properties of the photocured pressure-sensitive adhesives, but have no or minimal effect on the peeling and tack forces. The acetylene group participates in photocuring, which increases the cohesion strength of the pressure-sensitive adhesive and will be a new means for pressure-sensitive adhesives modification.

Key words: acetylene functionalization, photocuring, pressure sensitive adhesives, polyacrylates