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|a (NLM)17209633
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|a DE-627
|b ger
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|e rakwb
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|a eng
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|a Boyko, Volodymyr
|e verfasserin
|4 aut
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|a Chain dynamics in microgels
|b poly(N-vinylcaprolactam-co-N-vinylpyrrolidone) microgels as examples
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|c 2007
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|a Text
|b txt
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|a ohne Hilfsmittel zu benutzen
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|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 17.07.2007
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|a Date Revised 09.01.2007
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Microgels are highly swollen colloids built up of flexible cross-linked chains. We studied the static and dynamic light scattering (LS) behavior of thermosensitive microgels based on N-vinylcaprolactam and N-vinylpyrrolidone prepared by precipitation copolymerization in H2O (CP-1) and D2O (CP-2). Striking differences in behavior were observed in the two solvents. In both cases the angular dependence of static LS could reasonably well be described by a soft sphere model (J. Polym. Sci., Polym. Phys. Ed. 1982, 20, 157) with small deviations at large qRg. At temperatures larger than the collapse temperatures, the CP-1 sample in water started to aggregate whereas the CP-2 sample in D2O showed no association and developed the expected change toward hard sphere behavior. Dynamic LS permitted the determination of internal or segmental mobility. A remarkable shift toward large qRg was found for CP-1 compared to the behavior of linear chains. The dynamic behavior is clearly displayed in a plot of Gamma*(q) = (Gamma1(q)/q3)(eta0/kT), with Gamma1(q) the first cumulant of the field time correlation function and the common meaning of the other parameters. A long range of hard sphere behavior indicated the suppression of internal modes, but at large qRg the swollen microgel CP-1 in water displayed internal motions with a spectrum similar to that of Zimm relaxations. No internal mobility could be detected with the CP-2 sample in D2O. The behavior is in agreement with observations in the literature. The differences in the two similar solvents were attributed to the poorer solvent quality of D2O
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|a Journal Article
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|a Richter, Sven
|e verfasserin
|4 aut
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|a Burchard, Walther
|e verfasserin
|4 aut
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|a Arndt, Karl-Friedrich
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 23(2007), 2 vom: 16. Jan., Seite 776-84
|w (DE-627)NLM098181009
|x 0743-7463
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:2
|g day:16
|g month:01
|g pages:776-84
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|d 23
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|h 776-84
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