NMR Study on Polymer-Solvent Interactions during Temperature-Induced Phase Separation in Aqueous Polymer Solutions

2007 ◽  
Vol 251 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Jiří Spěváček ◽  
Lenka Hanyková
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Solvent Interactions ◽  
Aqueous Polymer ◽  
Nmr Study ◽  
Polymer Solvent

Strong polymer molecular weight-dependent material interactions: impact on the formation of the polymer/fullerene bulk heterojunction morphology

2017 ◽  
Vol 5 (25) ◽  
pp. 13176-13188 ◽  
Author(s):  
Joo-Hyun Kim ◽  
Abay Gadisa ◽  
Charley Schaefer ◽  
Huifeng Yao ◽  
Bhoj R. Gautam ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Molecular Mobility ◽  
Bulk Heterojunction ◽  
Morphological Evolution ◽  
Domain Size ◽  
S Phase ◽  
Polymer Molecular Weight ◽  
Solvent Interactions ◽  
Polymer Solvent

The morphological evolution is initiated by L–L or L–S phase separation (left) and further developed by molecular mobility, governed by polymer–solvent interactions which determine the final domain size of the BHJ layer (right).

Novel porphyrin-labelled poly(N-isopropylacrylamides): syntheses from bromoalkyl-containing prepolymers and physicochemical properties

2000 ◽  
Vol 04 (06) ◽  
pp. 579-587 ◽  
Author(s):  
YURI S. AVLASEVICH ◽  
TIMOUR A. CHEVTCHOUK ◽  
VALERY N. KNYUKSHTO ◽  
OLEG G. KULINKOVICH ◽  
KONSTANTIN N. SOLOVYOV
Keyword(s):  
Phase Transition ◽  
Phase Separation ◽  
Physicochemical Properties ◽  
Absorption Spectra ◽  
Polymer Solutions ◽  
Soret Band ◽  
Water Soluble ◽  
Absorption Bands ◽  
Aqueous Polymer ◽  
Peak Intensity

Novel water-soluble tetraarylporphyrin-labelled polymers have been synthesized by the reaction of bromoalkyl-containing poly(N-isopropylacrylamides) with 5-(4-pyridyl)-10,15,20-tri(4-methoxyphenyl) porphyrin. Corresponding Zn -porphyrin-containing polymers have also been prepared. Phase transition diagrams show that aqueous polymer solutions exhibit phase separation upon heating. Absorption spectra of the porphyrin-labelled polymers have been recorded in water and organic solvents. It is found that the absorption bands in aqueous polymer solutions are broadened and shifted bathochromically, the peak intensity of the Soret band in the polymer spectra being strongly lowered in water. Fluorescence properties of the polymers are briefly reported.

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