block structure
6.SYNTHESIS OF AB AND ABA TYPE PST(A)-PEO(B) BLOCK COPOLYMERS AND CHARACTERIZATION OF THEIR STRUCTURE
8.ZW serial self-priming and non-block sewage pump is a new structure product which is developed on base of reaping study of domestic and foreign similar technology.
9.The result indicative of Micro-phase separation in block copolymer PDMS/DDPS,and the steady helical structure of PDPS was destroyed and new random clew region gener- ated when it co-polymerized with the random clew structure polymer PDMS,and there is micro-phase structure in block copolymer PDMS/PDPS.

