Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent.

Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent. Research Abstract Details 

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Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent. Abstract Text:

Mitsuo Nakata,Yoshiki Nakamura,Naoki Sasaki,Yasuyuki Maki,Mitsuo Nakata,Yoshiki Nakamura,Naoki Sasaki,Yasuyuki Maki,Mitsuo Nakata,Yoshiki Nakamura,Naoki Sasaki,Yasuyuki Maki,

The transition from a chain-collapse process to a chain-aggregation process was studied by static light scattering on poly(methyl methacrylate) of the molecular weight m_{w}=1.22x10;{(7)} in the mixed solvent tert-butyl alcohol+water (2.5 vol%) . The concentration c of the solutions ranged from 0.5 to 2.5x10;{(-4)}g/cm;{3} and the measurement was carried out at appropriate time intervals up to the time t(h)=3250 after the quench to 35.0 degrees C which was a few degrees below the phase separation temperature. The molecular weight M_{w} and mean-square radius of gyration s;{2}_{z} were estimated from each scattering curve determined at the finite concentrations. At the initial stage of 100 h , s;{2}_{z} decreased rapidly with the time t indicating the chain collapse, while at the later stage of 3000h , s;{2}_{z} increased very slowly indicating the chain aggregation. The chain-collapse process and chain-aggregation process could be analyzed separately, though the two processes overlapped appreciably at the higher concentrations. The former process depended slightly on the concentration, while the latter process showed the exponential growth of ln M_{w} approximately ct and lns;{2}_{z} approximately ct . In the plot of lns;{2}_{z} versus ln M_{w} , the chain-collapse process was depicted by different lines depending on the concentration, while the chain-aggregation process was described by a single straight line. The transition from the former to the latter process occurred distinctly near 200 h after the quench irrespective of the concentration.

Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent. Publishing Authors By Initials

M Nakata,Y Nakamura,N Sasaki,Y Maki,M Nakata,Y Nakamura,N Sasaki,Y Maki,M Nakata,Y Nakamura,N Sasaki,Y Maki,

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Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Physical review. E, Statistical, nonlinear, and so

VOLUME: 76

Page Numbers: 041805

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ISSN: 1539-3755

DAY: 18

MONTH: 10

YEAR: 2007

Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Transition from a chain-collapse process to a chain-aggregation process of poly(methyl methacrylate) in a mixed solvent.

AFFILIATION: Department of Polymer Science, Faculty of Science, Hokkaido University, Kita-ku, Sapporo 060-0810, Japan.

Country: United States

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MEDLINETA: Phys Rev E Stat Nonlin Soft Ma

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