Polyarylacetylene blends with improved processability and high thermal stability

Abstract

Novel binary blends of polyarylacetylene (PAA resin) with propargyl-novoalc resin (PN resin) was prepared. The miscibility, processing capability, and thermal properties of the blends were investigated. The evaluation of the blends as matrice for thermostructural composites was also studied. The blends were highly miscible. In comparison to PAA resin, the blends exhibited remarkably improved processability suitable to various process techniques (especially resin transfer molding, RTM). By dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA), it was revealed that the cured blends possessed high thermal stability. The blend with 1/2 PN content was evaluated as matrices. The high temperature mechanical properties of silica laminates were compared favorably with those of conventional phenolic laminate. When compared with pure PAA laminate, the blend matrix laminate exhibited improved mechanical properties at both ambient temperature and high temperature.

Grafting Polymer Loops onto Functionalized Nanotubes: Monitoring Grafting and Loop Formation

“…[44] The peak centered at 1 709 cm À1 is associated with the C¼O stretch of aromatic COOH groups. [43,45,46] The results in Figure S1 therefore provide evidence of successful nanotube carboxylation.…”

“…The peak at 1 443 cm À1 is associated with the aromatic ring distortion. [45] The band observed at 839 cm À1 is attributed to the CÀH bend of aromatic rings [47] and the band at 819 cm À1 corresponds to the aromatic ring vibrations as well. The CÀH bending mode of the oxirane ring is expected to be found at 920 and 864 cm À1 .…”

General Approach to Individually Dispersed, Highly Soluble, and Conductive Graphene Nanosheets Functionalized by Nitrene Chemistry

“…The nitrenes are highly reactive intermediates that can be generated from azide groups through either thermolysis or irradiation, which has been tried for the covalent functionalization of CNTs, [32][33][34][35][36] fullerenes, 37-39 carbon nanoonions, 40 exfoliated graphite 41 and epitaxial graphene 42 via the [2 þ 1] cycloaddition of nitrenes to the π-electron system. In this paper, we utilize a series of compounds containing azide groups to introduce various functional groups or polymeric chains onto graphene nanosheets via the nitrene cycloaddition.…”

Mechanical and thermal properties of PP/compatibilized PP/acid treated SWNTs nanocomposites: Effect of different acid treatment times

“…The main processes for the synthesis of CNTs are chemical vapor deposition (CVD), gas phase catalytic growth, electrolytic synthesis, laser ablation and electric arc discharge [7]. However, due to phase separation of the polymer matrix and CNTs, large surface areas and strong van der Waals interactions between CNTs, the development of polymer/CNTs nanocomposites have been hindered largely by the lack of homogenous dispersions of CNTs [8][9][10]. To deal with this unpleasant phenomenon, many methods of CNTs treatment have been reported.…”