The polymer-polymer interaction parameters of STVPh/PPC blends were calculated by Hildebrand solubility parameter. Accordingly the miscibility of the blends was predicted. The segment motion and miscibility of blends ...The polymer-polymer interaction parameters of STVPh/PPC blends were calculated by Hildebrand solubility parameter. Accordingly the miscibility of the blends was predicted. The segment motion and miscibility of blends were also investigated by electron spin resonance(ESR) spin probe method. ESR spectra were measured as a function of temperature and the hydroxyl content in STVPh. For all blends, two spectral components with different rates of motion, a "fast" and a "slow" component were observed. This result showed that the nitrooxide radical existed in two different matrixes, a more flexible PPC-rich and a more rigid STVPh-rich micro domain. In addition, T 5mT and rotational correlation time τ c and activation energy E a were obtained from ESR spectra, which indicated the hydrogen bonding between the carbonyl and ether oxygen in PPC and the hydroxyl in STVPh was enhanced with increasing the hydroxyl content in STVPh.展开更多
A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared by self assembly of discrete colloidal crystals of silicalite 1, titanium silicalite 1(TS 1) and ZSM 5 , using pol...A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared by self assembly of discrete colloidal crystals of silicalite 1, titanium silicalite 1(TS 1) and ZSM 5 , using polystyrene(PS) spheres as templates. The properties of these novel materials were characterized by means of XRD, IR, SEM, 29 Si MAS NMR and N 2 adsorption/desorption measurements. These materials show ordered spheroidal voids, which are interconnected in three dimensions through windows. The ordering of the macropores are mainly affected by the particle size of the colloidal zeolites. [WT5HZ]展开更多
文摘The polymer-polymer interaction parameters of STVPh/PPC blends were calculated by Hildebrand solubility parameter. Accordingly the miscibility of the blends was predicted. The segment motion and miscibility of blends were also investigated by electron spin resonance(ESR) spin probe method. ESR spectra were measured as a function of temperature and the hydroxyl content in STVPh. For all blends, two spectral components with different rates of motion, a "fast" and a "slow" component were observed. This result showed that the nitrooxide radical existed in two different matrixes, a more flexible PPC-rich and a more rigid STVPh-rich micro domain. In addition, T 5mT and rotational correlation time τ c and activation energy E a were obtained from ESR spectra, which indicated the hydrogen bonding between the carbonyl and ether oxygen in PPC and the hydroxyl in STVPh was enhanced with increasing the hydroxyl content in STVPh.
文摘A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared by self assembly of discrete colloidal crystals of silicalite 1, titanium silicalite 1(TS 1) and ZSM 5 , using polystyrene(PS) spheres as templates. The properties of these novel materials were characterized by means of XRD, IR, SEM, 29 Si MAS NMR and N 2 adsorption/desorption measurements. These materials show ordered spheroidal voids, which are interconnected in three dimensions through windows. The ordering of the macropores are mainly affected by the particle size of the colloidal zeolites. [WT5HZ]
