Development of polymer‐molding‐releasing metal mold surfaces with perfluorinated‐group‐containing polymer plating

Abstract

ABSTRACT:The polymer-molding-releasing properties of metal molds were found to be related to the following factors: (1) interfacial chemical bonding between the surfaces of polymers and metal molds and (2) a friction force or friction coefficient between polar substances and/or lowmolecular-weight components in the polymers and physical factors on mold surfaces. We theoretically and experimentally confirmed that metal molds with good polymer-molding-releasing properties had very small surface free energies. We also proved that the surface free energies in the resulting polymer moldings were lower than before shaping. The molding releasing properties improved with decreasing friction force and friction coefficient between the surface of polymers and metal molds and with decreasing surface free energy. To obtain metal molds with lower surface free energies, we developed a polymer plating method with perfluorinated-group-containing triazine dithiol. The Metal mold treated by polymer plating had lower critical surface tension (7.5 mJ/m 2 ) than Teflon (18 mJ/m 2 ), indicating that the surface consisted of CF 3 Ϫ groups. The treated mold showed excellent durability in its releasing properties, which was better than that of the untreated mold. This technique was developed for the production of molds for the F lens and the naturally bright focusing screen.

A new class of silicone resins for coatings

“…Any unreacted cycloalkenes were removed under vacuum (3-1 mm Hg) to yield a clear, viscous oil. Products were characterized by 29 Si-NMR, 1 H-NMR, FTIR, and mass spectroscopy.…”

“…After distillation, any unreacted cycloalkene and side products were removed via vacuum (2-3 mm Hg) to yield pure cycloaliphatic dichlorosilane (~88% yield). Product characterization was performed by 29 Si-NMR, 1 H-NMR, FTIR, and mass spectroscopy.…”

“…The synthesis of amine-functionalized poly(dicyclopentylsiloxane-co-cyclopentylhydrosiloxane) and poly(dicyclohexylsiloxane-co-cyclohexylhydrosiloxane) was performed via the base-catalyzed ring-opening polymerization of cyclic oligomers of the cycloaliphatic-substituted polysiloxane. The monomers, oligomers, and polymers were characterized using 1 H-NMR, 29 Si-NMR, FTIR, and mass spectroscopy. From the monomers and oligomers, polysiloxanes homopolymers were prepared.…”

Effect of 6-Dioctylamino-1,3,5-triazine-2,4-dithiol Concentration on the Polymer Plating on Iron Plates

“…Nano-scale organic thin films of polymer/metal assemblies have become of interest in a range of potential applications, including decorative electrodes, 1 corrosion protection, 2,3 microelectronics, 4,5 releasing properties 6 and molecular adhesion promoters. 7,8 Some applications require the formation of nano-scale polymer films which are highly aligned and closely packed on metal surfaces.…”

“…7,8 Some applications require the formation of nano-scale polymer films which are highly aligned and closely packed on metal surfaces. [2][3][4][5][6] The authors have developed effective surface finishing technology that improves various surface characteristics through polymer plating of 6-substituted-1,3,5-triazine-2,4-dithiols (triazine dithiols). [9][10][11][12][13] Polymer plating is a method for coating metal surfaces and results in triazine disulfide polymers by electrochemical processing of triazine dithiols on anode surfaces.…”