Study on Hollow Light/Temperature Sensitive PNIPAM/SiO2 Polymer Microspheres
In this thesis,we synthesized thermal and photo dual stimuli-responsive monodisperse hollow polymeric microspheres via a novel distillation precipitation polymerization method.The core-shell particles were synthetized with SiO2 particles as a template which was modified by[3-(Methacryloyloxy) propyl] trime thoxysilane (MPS),thermo-responsive NIPAM as monomer,photoresponsive BMAAB as cross-linker,a few amount of DVB as aid cross-linker,and AIBN as initiator.Then using HF acid to selectively etch SiO2 core,we prepared the thermal and photo dual stimuli-responsive PNIPAM polymeric microspheres with hollow structure.It has the lowest lower critical solution temperature 32 ℃ (LCST).The morphologies of SiO2/PNIPAM coreshell particles and hollow PNIPAM particles are characterized by TEM,FT-IR.After RhB was successfully encapsulated into hollow microspheres,we studied their photo and thermo-responsive controlled release behaviors.The results show that the stimuli-responsive microspheres have been successfully fabricated via distillation precipitation polymerization with dual intelligent controlled release behaviors.
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