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An array of well-defined 4-, 8-, and 12-arm, chain-end functionalized, star polymers and their deuterated analogs has been synthesized using a t-butyldimethylsiloxy-functionalized alkyllithium initiator and anionic polymerization. The design of the synthesis provides for unusually well-defined comparisons of the behavior of the polymers with different chain-end functionality. For each star architecture...
The basic studies of in situ compatibilization process between polystyrene (PS) and polybutylene terephthalate (PBT) are carried out by adding various functionalized polystyrenes with mono, di, tetra hydroxy functions. The tensile mechanical properties of these in situ compatibilized blends are investigated. It is important to control the thermal degradation of PBT during the high temperature processing...
The in situ compatibilization process between polystyrene (PS) and polybutylene terephthalate (PBT) is carried out by adding three types of hydroxy functionalized polystyrenes (PS-Fs). The PS-F was used to promote the in situ copolymerization reaction and compatibilization during melt blending in the mixer. The results of different characterization techniques including Fourier transform infrared (FTIR),...
Phase morphology, crystal orientation, and overall crystallization kinetics as determined by self-organization of the diblock copolymer, vitrification of the amorphous block, and crystallization of the crystallizable blocks have been investigated for a lamellar-forming poly(ethylene oxide)-b-polystyrene (PEO-b-PS) diblock copolymer. The diblock copolymer has number-average molecular weights of 8700g/mol...
The polymerization of 1,3-butadiene (Bd) in a stirred batch reactor with the ternary catalytic system Nd(versatate) 3 /Al 2 Et 3 Cl 3 /Al(i-Bu) 2 H in cyclohexane at 70 o C has been studied with initial emphasis on the effects of the order of addition of the catalyst components, the concentrations of Al 2 Et 3 Cl 3 and Al(i-Bu)...
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