Phase behavior of polystyrene-b-poly(methyl methacrylate) diblock copolymer

Macromolecules

Volumn 42, Issue 20, 2009, Pages 7897-7902

  Ahn, Hyungju ^a   Ryu, Du Yeol ^a   Kim, Youngmin ^b   Kwon, Kyung Wook ^c   Lee, Jumi ^c   Cho, Junhan ^c  

^a Yonsei University   (South Korea)

^b Hong Ik University   (South Korea)

^c Dankook University   (South Korea)

Author keywords

[No Author keywords available]

Indexed keywords

CONTROLLED MOLECULAR WEIGHT; COPOLYMER MOLECULAR WEIGHT; CROSS INTERACTIONS; DEPOLARIZED LIGHT SCATTERING; DIBLOCK COPOLYMER; HIGHER TEMPERATURES; POLYSTYRENE-B-POLY(METHYL METHACRYLATE); PRESSURE RESPONSE; RANDOM PHASE APPROXIMATIONS; SCATTERING INTENSITY PROFILE; SMALL ANGLE X-RAY SCATTERING; TEMPERATURE RANGE;

APPROXIMATION THEORY; BLOCK COPOLYMERS; DYNAMIC LIGHT SCATTERING; DYNAMIC LOADS; ESTERS; MOLECULAR WEIGHT; ORGANIC POLYMERS; PLASTIC PRODUCTS; POLYMETHYL METHACRYLATES; POLYSTYRENES; SCATTERING; X RAY SCATTERING;

COPOLYMERIZATION;

EID: 70449369639     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma901313a     Document Type: Article

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50. x, which ensures that the copolymer of M=20000 is in the mean-field regime.
51. In addition, the most disperse PS-b-PMMA mixture out of the pristine samples in Table 1, which is symmetrically composed of two extreme molecular weights of 20000 and 35600 g/mol to finally have 27800 g/mol in the number-average molecular weight and the polydispersity of 1.20, turns out to show an ODT at 213 °C. Compared with an ODT at 175 °C for PS-b-PMMA-27.7, whose molecular weight is very close to that given above, the ODT for this most disperse PS-b-PMMA mixture is overestimated by 38 °C, which can then be attributed to the polydispersity effect. However, such polydispersity effect on ODT for PS-b-PMMAs listed in Table 1 is not believed to be significant, because all the PS-b-PMMAs have the narrow distributions with polydispersity less than 1.09.
52. 2 with γ = 1/√2 and C=π/6.
53. χ at ODT) is considered, Δε/k still needs to be reduced by ∼7% upon the given molecular weight decrease (ΔM= 4600).