Health & Environmental Research Online (HERO)


Print Feedback Export to File
6620895 
Journal Article 
ORDERED STRUCTURE IN MIXTURES OF A BLOCK COPOLYMER AND HOMOPOLYMERS .1. SOLUBILIZATION OF LOW-MOLECULAR-WEIGHT HOMOPOLYMERS 
Tanaka, H; Hasegawa, H; Hashimoto, T; , 
1991 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
AMER CHEMICAL SOC 
WASHINGTON 
24 
1 
240-251 
English 
WOS:A1991ER45200037 
Microdomain structures of binary mixtures of poly(styrene-b-isoprene) diblock polymer (SI) and homopolystyrene (HS) and ternary mixtures of SI, HS, and homopolyisoprene (HI) were investigated as a function of volume fraction of SI (phi-b) in the mixtures for given molecular weights of HS (M(HS)), HI (M(HI)), and SI (M(b)) and volume fraction of polystyrene (PS) block chain (f) in the block polymer SI at a strong segregation limit. The systems studied here have characteristics of f = 0.45, M(HS)/M(b) = 0.068, and M(HI)/M(b) = 0.073. The results indicated that (i) the homopolymers HS and HI are solubilized essentially uniformly in the corresponding microdomains, causing changes of the microdomain morphology with the change of total volume fraction of the constituent polymer, e.g., PS and the size each microdomain, and that (ii) the long-range order of the microdomains is conserved down to a very low level of phi-b, with a phi-b as low as 0.10 being observed in this experiment.