Facile synthesis of silica nanoparticles grafted with quaternized linear, comblike and toothbrushlike copolymers

Abstract

The alkoxysilane–hydroxyl coupling reaction, quaternization and RAFT polymerization were combined to synthesize three types of quaternized copolymers grafted silica with thermo-dependent surface wettability.

Isotactic-Polypropylene/Atactic-Polystyrene Miktoarm Star Copolymers: Synthesis and Aggregation Morphology

“…Atactic polystyrene ( a PS) was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization of styrene in toluene solvent with a monomer volume concentration of 50%. AIBN was used as the initiator and 4-(trimethoxysilyl)benzyl dithiobenzoate (TBDB) (synthesis route is shown in Chart 1 according to the literature [25]) as the RAFT agent. The molar ratio of St/TBDB/AIBN was set as 50/1/0.2, 100/1/0.2, and 150/1/0.2 for the synthesis of PS-1, PS-2, and PS-3, respectively.…”

Grafting of pH-sensitive poly (N,N-dimethylaminoethyl methacrylate-co-2-hydroxyethyl methacrylate) onto HNTS via surface-initiated atom transfer radical polymerization for controllable drug release

“…The pH-sensitivity of PDMAEMA is due to presence of ionizable tertiary amine groups with pK a of 7.3 which can be protonated at low pH conditions and lead to a pronounced change in polymer hydrophilicity upon protonation and deprotonation [6][7][8].…”

Study of structure–performance relationships of polymeric dispersants on particle dispersion and stabilisation

“…[4][5][6][7] Such surfactants have traditionally been small molecular surfactants, but recent advancement in polymer chemistry has made the more effective polymeric dispersants available. This is especially supported by the development of controlled/living radical polymerisation (CLRP) techniques, such as atom transfer radical polymerisation (ATRP), [8][9][10][11][12] reversible addition-fragmentation chain transfer (RAFT) polymerisation, [13][14][15][16] nitroxide-mediated polymerisation (NMP) 17,18 and others, 19,20 which have overcome the limitations of conventional polymerisation methods in polymeric structure design and synthesis. Through CLRP, polymeric dispersants with controlled molecular weight, narrow molecular weight distribution and well-dened structures can be prepared, including block copolymers (AB, ABA, BAB), [21][22][23][24][25][26] gra copolymers (comb, dendrimer, hyperbranched) [27][28][29][30] and others, [31][32][33][34][35][36] which are more effective in particle dispersion than homopolymers or random copolymers synthesised by conventional polymerisation methods.…”