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Volumn 40, Issue 26, 2007, Pages 9482-9490

Kinetics of phase transition from lamellar to hexagonally packed cylinders for a triblock copolymer in a selective solvent

Author keywords

[No Author keywords available]

Indexed keywords

DIBUTYL PHTHALATE (DBP); LAMELLAR (LAM);

EID: 38349122134     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma071192m     Document Type: Article
Times cited : (30)

References (44)
  • 34
    • 38349099076 scopus 로고    scopus 로고
    • To calculate the polymer-solvent Flory-Huggins χ parameter we use the Hildebrand solubility parameter approach (see ref 30, which gives χpoiymer-soivent, V(δ1 -δ2) 2/RT, 0.34, where Vis the molar of the solvent and χ1 and χ2 are the solubility parameters of the polymer and the solvent, respectively. The solubility parameters of PS, PEB, and DBP obtained from ref 30 are 18.6, 17.2, and 19.1, J/ m3) 1/2 x 10-3, respectively. Molar of DBP calculated from its molecular weight and density is 2.65 x 10-4 m-3
    • 3.
  • 35
    • 38349147148 scopus 로고    scopus 로고
    • The polymer-polymer interaction parameter χN for SEBS polymer is approximated using the approach of ref 28 for SBS with χN, 900, 7.5 x 105/T(Mw,AVA, Mw,BVB, where N is the degree of polymerization, MW,A and MW,B are weight average molecular weights of polymers A and B, respectively, and vA and vB are the specific of the polymers A and B, respectively. For SEBS, weight average molecular weights of A block (PS) and B block (PEB) are 28 and 72 g/mol, respectively. The specific of PS, 0.919 cm3 and PEB, 1.114 cm3 are obtained from ref 32
    • 3 are obtained from ref 32.
  • 39
    • 38349172783 scopus 로고    scopus 로고
    • In the fitting procedure, the initial guess is taken as the final values of the previous frame. We start with the frame at t, 0 using the initial LAM phase as starting value for the parameters and with the last frame with initial guess values from the HEX phase. The program then fits each successive frame using the final values for the previous frame as initial guess for the next frame. Because we fit starting from two ends, the cumulative effects lead to a mismatch at t= 20 min. Variations of the fitting procedure starting at only one end, either the beginning or the end of the run, were also tried. The overall trends are the same, but these fits show more variance at the far end
    • In the fitting procedure, the initial guess is taken as the final values of the previous frame. We start with the frame at t = 0 using the initial LAM phase as starting value for the parameters and with the last frame with initial guess values from the HEX phase. The program then fits each successive frame using the final values for the previous frame as initial guess for the next frame. Because we fit starting from two ends, the cumulative effects lead to a mismatch at t= 20 min. Variations of the fitting procedure starting at only one end, either the beginning or the end of the run, were also tried. The overall trends are the same, but these fits show more variance at the far end.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.