Synthesis Of Biodegradable Macro Monomer And Research On Preparation Of Emulsion-Derived(Polyhipe)Polymer Porous Materials

Polymer foams prepared form high internal phase emulsion templating have typical open pores structure, accurately controllable pore diameter and size distribution, high porosity and huge specific surface area. The foams prepared by this method have applications in many fields, such as seperation, catalization, medicine, and tissue engineering, and show promising prospects. In present dissertation, a kind of acrylic acid terminated poly(lactic acid) diol with ability of free radical polymerization was fabricated and introduced into HIPEs. We obtained a series of biodegradable shape memory polyHIPEs with alterable responsive temperatures by adjusting the compositions of their precuser HIPEs. Besides, we also studied the effects of poly(lactice acid) fiber, amphiphilic block copolymer, and methacryloxypropyltrimethoxylsilane monomer on the properties of polyHIPEs modified by them, respectively. The main research works are as follows:1. Poly(lactic acid)(PLA) diol oligomer was synthesized by melt copolycondensation of lactic acid and1,4-butanediol. And then by esterification of PLA diol and acrylic acid, acrylic acid terminated PLA-macro monomer(PLA-MM) was obtained and charaterized by Fourier Transform infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR).2. With emulsifier content of20wt%of the monomers and oil phase vs water phase weight ratio of2:8, HIPEs contained PLA-macro monomer, Trifluoroethyl methacrylate (TFEMA), and2-ethylhexyl acrylate (EHA) as monomer and Trimethylolpropane triacrylate (TMPTA) as crosslinker sucessfully polymerized and polyHIPEs were obtained. The pore structure, thermal property, and shape memory property of polyHIPEs was characterized by scanning electron microscope(SEM), thermomechanical analysis(TMA), and Thermal mechanical analysis(DMA), respectively. The contents of PLA-MM and EHA have effects on pore diameter and Tg of polyHIPEs. PolyHIPEs containing PLA-MM showed a characterstic of thermal responsive shape memory foams and a100%shape reovery under the thermal stimuli and as high as98%shape fixity in the deformed state and well persistence on the form structure. PolyHIPEs with a broad range of Ttranss from24℃to108℃can be obtained by adjusting the monomer composition of HIPEs. Besides, the incorporation of PLA-MM in the backbone of polyHIPE made the foam degradable. We researched on the effects of PLA-MM content on the degradation rate in a accelerated dagradation test.3. We also studied the effects of PLA fiber, PMAA-b-PBA block copolymer, and methacryloxypropyltrimethoxylsilane on the properties of polyHIPEs. The PLA fiber endowed the resulting polyHIPE with better dimensional stability, unbroken clear pore structure and mechanical properties, but had no effects on the thermal degradation temperature of polyHIPEs. We synthesised a polyHIPE stabilized by amphiphilic block copolymer instead of span80, when the content of copolymer and pH of aqueous phase were appropriate, the resulting polyHIPE had closed pore structures with large average pore diameters of about114μm. The incorporation of methacryloxypropyltrimethoxylsilane into the HIPEs formed an inorganic-organic structure which can largely improve mechanical strength of the resulting polyHIPEs. A kind of inorganicn porous material can be obtained by calcining the polyHIPEs at high temperature.