Effect of an Organically Modified Nanoclay on Low‐Surface‐Energy Materials of Polybenzoxazine

Abstract

Novel low surface free energy materials of polybenzoxazine/organically modified silicate nanocomposites have been prepared and characterized. The CPC (cetylpyridinium chloride)/clay10%/poly(3‐phenyl‐3,4‐dihydro‐2H‐1,3‐benzoxazine) (PP‐a) material possesses an extremely low surface free energy (12.7 mJ · m−2) after 4 h curing at 200 °C, which is even lower than that of poly(tetrafluoroethylene) (22.0 mJ · m−2) calculated on the basis of the three‐liquid geometric method. X‐Ray photoelectron spectroscopy (XPS) shows a higher silicon content on the surface of the nanocomposites than for an average composition, which implies that the clay is more preferentially enriched on the outermost layer. In addition, the glass transition temperature (Tg) of the polybenzoxazine (PP‐a) in the nanocomposite is 22.6 °C higher and its thermal decomposition temperature is also 31.5 °C higher than the pure PP‐a. This finding provides a simple way to prepare low surface energy and high thermal stability materials.magnified image

Functional Silica and Carbon Nanocomposites Based on Polybenzoxazines

“…Transmission electron microscopy (TEM) images of the PBZ/MMT nanocomposites revealed partially exfoliated/intercalated structures. We have also prepared new hybrid materials from cetylpyridinium chloride (CPC), clay, and poly(3‐phenyl‐3,4‐dihydro‐2 H ‐1,3‐benzoxazine) (PP‐a) . These novel low‐surface‐free‐energy materials, PBZ/organically modified silicate nanocomposites, possessed intercalated structures (based on X‐ray analyses) as well as enhanced water contact angles, values of T g and T d , and char yields, compared with those of PP‐a alone, when the clay loading was increased from 3 to 10 wt%.…”

Polybenzoxazine‐based composites as high‐performance materials

“…In another study, Fu et al reported cetylpyridinium chloride (CPC)‐modified polybenzoxazine (PP‐a)/clay nanocomposites 79. The structures of monofunctional benzoxazine P‐a and its polymer PP‐a are depicted in Scheme .…”

PET‐ionomers and PETi/MMT nanocomposites: A comparison of the effect of ionic groups on their crystallinities and physical properties

“…Many papers define nanocomposites as polymer compounds which have a multilateral particle in the nanometer range [1–4]. Several types of polymer/clay nanocomposites have been developed by both academia and industry over the past decade [5–11]. Much of the work in this field has focused on polymer nanocomposites of poly(ethylene terephthalate) (PET) and a layered silicate such as montmorillonite (MMT) due to their commercial viability.…”