TAILIEUCHUNG - Wide Spectra of Quality Control Part 12

Tham khảo tài liệu 'wide spectra of quality control part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 320 Wide Spectra of Quality Control C O I nh2 C O 1 C O 1 C O 1 C O 1 C O 1 C O 1 1 O 1 O 1 OH 1 O 1 O 1 1 O 1 1 C4H9 1 CH2 1 2 1 C8H17 CH3 C2H5 1 CH C2H5 C4H9 n-butyl acrylate Tg -54 C 2-ethylhexyl acrylate Tg -70 C acrylic acid Tg 106 C n-octyl acrylate Tg -65 C methyl acrylate Tg -6 C ethyl acrylate Tg -24 C acryl amide Tg 179 C Fig. 2. Typical chain of acrylic PSA copolymer Solvent-borne water-borne and solvent-free acrylic PSAs are nowadays predominantly manufactured by polymerization from a wide selection of acrylic methacrylic and other monomers often with low levels of monomers having pendant functional groups in a refluxing organic solvent in the present of an initiator such as organic peroxides or azo compounds Solvent-borne PSA acrylics offer several advantages such as excellent aging characteristics and resistance to elevated temperatures and plasticizers exceptional optical clarity due to the polymer compatibility and non-yellowing. They also have the highest balance of adhesion and cohesion and an excellent water resistance. Lower adhesion to nonpolar polyolefins is caused by the polar chemistry of acrylics. Acrylics polymer chemistry is expanding through the introduction and utilization of new raw materials new polymerization process new modification methods new crosslinking agents and new crosslinking kind and technology. General properties Although the pressure-sensitive acrylic adhesives may be dwarfs in terms of quantity they are giants when considered from the quality point of view. Only by means of these acrylic specialties was it possible to succeed in drafting the present surprisingly efficient generation of medical pressure-sensitive adhesive tapes and other self-adhesive materials medical grade for prominent assembly projects at justifiable cost for medical applications. The most important requirements for a pressure-sensitive adhesive such as high tackiness adhesion by the touch high cohesion inner stability high stickiness adhesion UV

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