Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Abstract

Star-shaped polyhedral oligomeric silsesquioxane (POSS)-methacrylate hybrid copolymers with phenyl-triazole as terminal groups had been designed and synthesized via sequential atom transfer radical polymerization (ATRP), azidation, and phenylacetylene-terminated procedures, and the hybrid copolymers here could be denoted as POSS-(PXMA-Pytl) 8 , where X can be M, B, L, and S, represented four different methacrylate monomers, such as methacrylate (MMA), butyl methacrylate (BMA), lauryl methacrylate (LMA), and stearyl methacrylate (SMA), respectively. Thermal gravimetric analysis (TGA) and in situ Fourier transform infrared spectroscopy (FTIR) were applied for studying the thermal stability and degradation mechanism, and it was found that all of the POSS-(PXMA-Cl) 8 and POSS-(PXMA-Pytl) 8 copolymers exhibited excellent thermal stabilities, which had great potential in heat-resistant material application. Different tendencies of decomposition temperatures at 5% and 10% weight loss (T 5 and T 10 ) dependent on the side-chain length and terminal group species were investigated respectively. The longer alkyl side chains of the monomers, the lower thermal stabilities, and enhanced T 5 and T 10 were also shown with the introduction of phenyl-triazole groups instead of chlorine groups.

Synthesis and thermal decomposition kinetics of poly(methyl methacrylate)-b-poly(styrene) block copolymers

“…The pyrolysis reactions often start with the halogen terminal group and then mainly attribute to chain depolymerization. 32,33…”

“…The pyrolysis reactions often start with the halogen terminal group and then mainly attribute to chain depolymerization. 32,33 As shown in Table 2, it is found that the decomposition temperatures increase as the heating rate increases. Both T 1 and T 2 increase successively in the order of PMMA, PMMA-b-1PS, and PMMA-b-1.8PS at the same heating rate.…”

Sulfonated polymers containing polyhedral oligomeric silsesquioxane (POSS) core for high performance proton exchange membranes

“…Materials POSS-(Cl) 8 was synthesized and used as initiator, as described in a previous report [27]. All chemicals were of reagent grade and used as received, unless specified otherwise.…”

Progress in the self-assembly of organic/inorganic polyhedral oligomeric silsesquioxane (POSS) hybrids

“…95,96 In general, the syntheses of such polymer-POSS hybrids have been performed by using monofunctionalized POSS NPs as macro-initiators for living polymerizations [e.g., anionic, cationic, ring opening polymerization (ROP), nitroxide-mediated polymerization (NMP), reversible addition-fragmentation chain transfer (RAFT), atom transfer radical polymerization (ATRP)] and click chemistry. [97][98][99][100][101][102][103] For example, we used a chain-end-tethered mono-functionalized chloride-POSS as a macroinitiator to prepare a poly(methyl methacrylate)-block-POSS (PMMA-b-POSS) hybrid through ATRP [Fig. 3(a)].…”