We synthesized Optically Clear Adhesive (OCA) polymers by free radical polymerizations and cured them as an interlayer between two polyethylene terephthalate (PET) release films. Some fundamental characteristics of OCA polymers including glass-transition temperature (T g ), molecular weight, viscosity, probe tack and peel strength were investigated with the change of methyl methacrylate (MMA) and 2-hydroxyethyl acrylate (HEA) monomers. The optical characteristics of OCA films were also investigated on the change of ripening temperature, hightemperature aging and heat-moisture aging. The resistance change rates of ITO-coated films were measured with heat-moisture treatment for two weeks. The results suggested that the OCA films can effectively protect ITO films and the synthesized OCA polymer can be expected to be applied to touch panel devices.

ABSTRACT:: The curing behavior of two resins, five blocked toluene diisocyanate (TDI) crosslinkers and polyacrylate, was studied using Torsional Braid Analysis (TBA) to examine their dynamic mechanical properties. The curing process was clearly divided into two stages. Associated with data from in situ FTIR at the molecular level, the first stage was the reaction of deblocked NCO and hydroxyl in polyacrylate. In the second stage, the deblocked NCO attacked the hydrogen in NH group of the urethane bond to conduct deep curing. Computer modeling was used to investigate the lowest-energy configuration of the crosslinker molecule. The space hindrance effect in the molecule causes this type of three-group crosslinking curing mechanism in the blocked TDI crosslinker.

In this study, the synthesis of a novel cationic coumarin-containing polymer (C-CPA) was presented. C-CPA was examined optically using photoluminescence (PL) spectroscopy. The optical data suggested that they were promising blue-emitting materials mainly due to the coumarin chromophore on the side chain. Moreover, the synthesized cationic polymer was suitable for layer-by-layer electrostatic selfassembly thin film deposition from dilute polymer solution and multilayers were fully characterized by UV-vis spectroscopy, PL spectroscopy and atomic force microscope.

An ultrathin film was formed by the electrostatic self-assembly of polyelectrolyte poly-N-ethyl-N,Ndimethyaminoethyl methacrylate (PDMAEB) and the organic dye metanil yellow (MY) on a smooth glass sheet. An atomic force microscope was used to study the topography and the phase of the two samples and the ultrathin film (PDMAEB-MY). The dynamic course of the surface structure was researched by atomic force microscopy also. It is illustrated that the existence of electrostatic interactions between PDMAEB and MY made MY arrange in order on the polyelectrolyte surface.

We studied the solution fluorescence quenching of poly(methylphenethylsilane) (1#), poly(dimethylsilane‐co‐methylphenethylsilane) (2#), poly(n‐hexylmethylsilane) (3#), and poly(dimethylsilane‐co‐n‐hexylmethylsilane) (4#) by such quenchers as CCl4, CHCl3, Cl2CHCHCl2, and methyl benzoate. We treated the fluorescence quenching data using the equations F0/F = 1 +KSV[Q],F0/F exp(−NV[Q]) = 1 +KSV[Q], and ln(F0/F) =NV[Q], where F and F0 are the fluorescence intensity with and without the addition of a quencher, respectively; KSV, the Stern–Volmer constant; [Q], the quencher concentration; N, Avogadro's constant; and V, the volume of the active sphere. For the systems with both static quenching and dynamic quenching, we calculated their contributions and the critical quencher concentration [Q]C and determined the nature of the fluorescence quenching in different quencher concentration ranges. We observed that, under the condition of the same quencher, the fluorescence quenching of the polysilane homopolymer is smaller than that of its corresponding polysilane copolymer, that is, 1# < 2# and 3# < 4#, and that for the fluorescence quenching of the same polysilane by different chlorohydrocarbons the fluorescence quenching ability of CCl4 is larger than that of CHCl3 and Cl2CHCHCl2. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 133–139, 2000