Linear melt rheology and small-angle X-ray scattering of AB diblocks vs A2B2 four arm star block copolymers

Macromolecules

Volumn 33, Issue 22, 2000, Pages 8399-8414

  Buzza, D M A ^a   Fzea, A H ^a   Allgaier, J B ^b   Young, R N ^b   Hawking, R J ^a   Hamley, I W ^a   McLeish, T C B ^c   Lodge, T P ^d  

^a UNIVERSITY OF LEEDS   (United Kingdom)

^b UNIVERSITY OF SHEFFIELD   (United Kingdom)

^c University of Minnesota   (United States)

^d UNIVERSITY OF DUNDEE   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

KAWASAKI-ONUKI THEORY; LAMELLAR MORPHOLOGY; LINEAR MELT RHEOLOGY; MESOPHASE RELAXATIONS; ROUSE DYNAMICS; SMALL ANGLE XRAY SCATTERING;

CHEMICAL RELAXATION; MATHEMATICAL MODELS; MOLECULAR WEIGHT; MORPHOLOGY; ORDER DISORDER TRANSITIONS; PHASE COMPOSITION; POLYISOPRENES; POLYSTYRENES; RHEOLOGY; THERMAL EFFECTS; VISCOELASTICITY; X RAY SCATTERING;

BLOCK COPOLYMERS;

EID: 0034290976     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma000382t     Document Type: Article

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45. This of course presupposes that we do not have parallel addition of the domain moduli where the soft phase dominates (e.g., when the lamellae are oriented parallel to the shearing plates). However, we expect this assumption to be valid for our unoriented samples since the microdomains are globally disordered.
46. The composition and temperature dependences of local friction factors in polymer mixtures is often complicated, and hard to predict on the basis of pure component values.33"35 On the other hand, for the particular .case of styrèneisoprene systems, Milhaupt et al. have shown that the friction factors of the two components are essentially identical in a given matrix, and depend mostly on the distance from the glass transition of the matrix.36 In the microphase-separated state the situation is further complicated because the friction factors should depend on position, with the largest values corresponding to the regions richest in styrène.