Transparency and water vapor barrier properties of polybenzoxazine‐silica nanocomposites provided with perhydropolysilazane

Abstract

Poly[6,6′‐(1‐methylethylidene)bis(3,4‐dihydro‐3‐2H‐1,3‐hexylbenzoxazine)] (PB‐hda)‐silica nanocomposites were synthesized with perhydropolysilazane (PHPS) and PB‐hda by ring opening polymerization in one step. Both high transparency and good water vapor barrier property (WVP) are required to be improved in the field of packing and electronic materials, such as OLED, solar cell, and electronic paper. PB‐hda has shown high toughness and high thermal stability. However, it became dark brown and showed a reduction of WVP with increasing curing temperature, which make it difficult to be applied to packing and electronic materials. In this study, we aim to improve transparency and WVP by addition of PHPS into PB‐hda matrix. It was found that nanocomposites showed the improvement of WVP and transparency owing to SiOC linkages between PB‐hda and PHPS. In particular, a nanocomposite with 1 wt % of silica showed the most significant improvement in terms of transparency and the WVP. These properties were found to be influenced by the thickness of the combined polymer‐silica layers that formed around the silica particles; these layers were thickest in the 1 wt % sample. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44238.

Dense, uniform, smooth SiO2/TiO2hard coatings derived from a single precursor source of tetra-n-butyl titanate modified perhydropolysilazane

“…24,25 Based on this, novel types of siliconbased multicomponent ceramics or organic-silica nanocomposites endowed with new properties have been developed. [26][27][28][29][30][31][32][33] Moreover, the Si-N bonds in PHPS are easily hydrolysed to form Si-OH, 18 which implies that when using PHPS as a source of SiO 2 in the preparation of SiO 2 /TiO 2 coatings, the trickiest problem existing in the traditional solgel route may be avoided: namely the slower hydrolysis reaction rate of alkoxylsilane as a source of SiO 2 compared to the Ti precursor for TiO 2 . However, to our knowledge, there is still no report on the preparation of SiO 2 /TiO 2 coatings where PHPS is adopted as the source of SiO 2 .…”

Layer‐by‐layer modification of porous polybenzoxazine with silver nanoparticles for enhanced CO2 storage

“…Polymeric thermosets such as polybenzoxazine (PBZ) with high porosity have been proposed as potential adsorbent materials for capturing CO 2 gas due to their high thermal and chemical stability, good regeneration, and tunable pore size. PBZ, a novel thermoset resin developed by Ishida in the 1990s, does not require catalyst for polymerization, has a low water adsorption, low shrinkage, no release of volatile compounds during polymerization, and most importantly has a high molecular design flexibility . Typically, porous PBZ are synthesized by the sol–gel reaction of a phenolic derivative, an amine and formaldehyde through ring‐opening polymerization .…”