Photoinduced Microencapsulation of Microcapsules Containing n-Octadecane with P(APUA) and P(AMA) Shell

An advanced microencapsulation for n-octadecane has been successfully developed via UV photoinduced polymerization in this study, which was characterized by some superior qualities (e.g. rapid microencapsulation, energy-saving and environment-friendly) compared to conventional microencapsulation process. The morphology, microstructure and properties of the microencapsulated n-octadecane with poly (aliphatic polyurethane acrylate) and poly (allyl methacrylate) as shell were respectively investigated by FE-SEM, TEM and DSC. The effects of UV irradiation time, shell material types and feed ration of shell-forming monomer to n-octadecane on the morphology and structure were investigated in detail. Furthermore, the photoinduced microencapsulation mechanism was interpreted clearly as well. Besides, the phase change properties were studied as well.

Synthesis and Functionalization of Silicone Hydride Copolymer with Allyl Methacrylate via Hydrosilylation Method

Silicone hydride copolymer was functionalized with allyl methacrylate under the platinum catalyzed hydrosilylation reaction to yield comb-like poldimethylsiloxane grafted with methacrylate. The reaction was monitored via attenuated total reflectance Fourier transform infrared spectroscopy. Silicone hydride copolymer was synthesized in advance under cationic equilibrium ring opening polymerization. From the results, silicone hydride copolymer was synthesized based on cationic equilibrium ring opening polymerization mechanism under acidic condition. The peaks obtained from attenuated total reflectance Fourier transform infrared spectrum and nuclear magnetic resonance spectra corresponded to silicone hydride copolymer structure and ascertained that the silicone hydride copolymer synthesis was completed after 72 hrs of reaction. Functionalization process of silicone hydride copolymer had proceeded according to the Chalk-Harrod mechanism. The disappearance of Si-H peak at 2157 cm-1 had been observed in the attenuated total reflectance Fourier transform infrared spectra had indicated that the functionalization process was completed after 48 hrs of reaction.