Abstract
Reactive oligomers of styrene–maleic anhydride having controlled architecture were prepared using reversible addition fragmentation chain transfer (RAFT) polymerization. The co-oligomers were characterized by FTIR, Raman, NMR and GPC. The arrangement of co-monomers (i.e. the architecture) in the co-oligomeric RAFT agents could be controlled by changing the molar feed ratio of styrene to maleic anhydride in the range of 1–5.25 under controlled polymerization conditions. Non-alternating (homopolymer) blocks of styrene could be suppressed even at high mole ratios > 1 and the resultant co-oligomeric RAFT agents consisting of mainly alternating (SMS) and semi-alternating (SSM) sequences of styrene and maleic anhydride were obtained. These macro RAFT agents behaved as efficient reactive surfactants and their self-aggregation behavior was greatly influenced by their architecture. These could be successfully used for surfactant-free nanoencapsulation of active hydrophobic materials, such as n-octadecane, indicating their suitability for various applications.
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