Synthesis and properties of poly(isobutyl methacrylate‐co‐butanediol dimethacrylate‐co‐methacryl polyhedral oligomeric silsesquioxane) nanocomposites

Abstract

Poly[isobutyl methacrylate‐co‐butanediol dimethacrylate‐co‐3‐methacrylylpropylheptaisobutyl‐T8‐polyhedral oligomeric silsesquioxane] [P(iBMA‐co‐BDMA‐co‐MA‐POSS)] nanocomposites with different crosslink densities and different polyhedral oligomeric silsesquioxane (MA‐POSS) percentages (5, 10, 15, 20, and 30 wt %) were synthesized by radical‐initiated terpolymerization. Linear [P(iBMA‐co‐MA‐POSS)] copolymers were also prepared. The viscoelastic properties and morphologies were studied by dynamic mechanical thermal analysis, confocal microscopy, and transmission electron microscopy (TEM). The viscoelastic properties depended on the crosslink density. The dependence of viscoelastic properties on MA‐POSS content at a low BDMA loading (1 wt %) was similar to that of linear P(iBMA‐co‐MA‐POSS) copolymers. P(iBMA‐co‐1 wt % BDMA‐co‐10 wt % MA‐POSS) exhibited the highest dynamic storage modulus (E′) values in the rubbery region of this series. The 30 wt % MA‐POSS nanocomposites with 1 wt % BDMA exhibited the lowest E′. However, the E′ values in the rubbery region for P(iBMA‐co‐3 wt % BDMA‐co‐MA‐POSS) nanocomposites with 15 and 30 wt % MA‐POSS were higher than those of the parent P(iBMA‐co‐3 wt % BDMA) resin. MA‐POSS raised the E′ values of all P(iBMA‐co‐ 5 wt % BDMA‐co‐MA‐POSS) nanocomposites in the rubbery region above those of P(iBMA‐co‐5 wt % BDMA), but MA‐POSS loadings < 15 wt % had little influence on glass‐transition temperatures (Tg's) and slightly reduced Tg values with 20 or 30 wt % POSS. Heating history had little influence on viscoelastic properties. No POSS aggregates were observed for the P(iBMA‐co‐1 wt % BDMA‐co‐MA‐POSS) nanocomposites by TEM. POSS‐rich particles with diameters of several micrometers were present in the nanocomposites with 3 or 5 wt % BDMA. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 355–372, 2005

Preparation of novel methyl methacrylate/fluorinated silsesquioxane copolymer film with low surface energy

“…[6][7][8][9][10][11]. Nanocomposites prepared via copolymerization are more reported due to the higher efficiency compared to those prepared via physical blending.…”

Synthesis, Characterization and Self‐Assembly of Novel Amphiphilic Block Copolymers with a Polyhedral Oligomeric Silsesquioxanes Moiety Attached at the Junction of the Two Blocks

“…Possessing a cube-octameric structure with high symmetry and an inorganic silicalike core (Si 8 O 12 ) with an average diameter of 1.5 nm, POSS can be used as a building block to fabricate nanostructured composite materials. [1][2][3] Moreover, the inorganic core of the POSS is surrounded by eight organic corner groups, one or more of which can be substituted by a functional group, and it is therefore feasible to incorporate POSS into polymers via grafting [4] and copolymerization, [5] or to modify polymer materials via blending. [6] Owing to the size of the pendant, the POSS cage is comparable to the dimensions of linear polymers and, thus, POSS can effectively control the motion of the chains at the molecular level, resulting in a true nanoscopic distribution of POSS in nanocomposites.…”

The effect of incorporation of POSS units on polymer blend compatibility

“…12 Compatibilization occurred if the POSS was grafted onto the backbone of one of the polymers and had the following consequences: reduced domain size, increased interfacial width, and greatly improved fracture toughness between immiscible polymers. 11,13,14 In this study, we focused on the effect of interchain interaction on the compatibility when POSS is a pendant moiety attached to the polymer main chain. The aim is to see what the effect of incorporation of POSS units into a copolymer has on miscibility, both with the corresponding homopolymers and between two different POSS copolymers.…”