scholarly journals Effects of Polymerization Temperature on Structure and Properties of Thermo plastic Polyurethane Elastomers Prepared by a One-Shot Method

2005 ◽  
Vol 78 (7) ◽  
pp. 260-266
Author(s):  
Satoshi YAMASAKI ◽  
Daisuke NISHIGUCHI ◽  
Ken KOJIO ◽  
Mutsuhisa FURUKAWA
Keyword(s):  
Polymerization Temperature ◽  
Structure And Properties ◽  
Polyurethane Elastomers

The influence of polymerization temperature on structure and properties of polyaniline

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Faris Yılmaz ◽  
Zuhal Küçükyavuz
Keyword(s):  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Molecular Weight ◽  
Hydrochloric Acid ◽  
Liquid Medium ◽  
Thermal Studies ◽  
Ammonium Persulfate ◽  
Morphological Properties ◽  
Polymerization Temperature ◽  
Structure And Properties

AbstractThe influence of polymerization temperature (from -25 to +25 oC) on molecular weight, crystallinity, electrical conductivity, thermal and morphological properties of polyaniline has been investigated. Aniline was oxidized in an aqueous medium with ammonium persulfate and 1.0 M hydrochloric acid. The reaction mixture freezes below -10 oC and hence lithium chloride was used in sufficient amount to prevent freezing. As the reaction temperature decreases, both the molecular weight of polyaniline and its crystallinity increase. Thermal studies show a common three step decomposition pattern irrespective of the temperature used during synthesis. The morphology of polyaniline changes from granular (reaction in liquid medium) to tubular (polymerization in the frozen state). Thermal analysis indicated that the polyaniline stability increased with decreasing synthesis temperatures. Electrical conductivity of polyaniline was found to be independent of the polymerization temperature and, consequently, of the molecular weight.

The effect of polymerization temperature on the structure and properties of poly(1-hexene) and poly(1-decene) prepared with a Ni(II)–diimine catalyst

2008 ◽  
Vol 133-135 ◽  
pp. 879-885 ◽  
Author(s):  
João A.S. Bomfim ◽  
Marcos L. Dias ◽  
Carlos A.L. Filgueiras ◽  
Frédéric Peruch ◽  
Alain Deffieux
Keyword(s):  
Polymerization Temperature ◽  
Structure And Properties

Nanophase separation in segmented polyurethane elastomers: Effect of specific interactions on structure and properties

2008 ◽  
Vol 44 (8) ◽  
pp. 2431-2438 ◽  
Author(s):  
Béla Pukánszky ◽  
Kristóf Bagdi ◽  
Zsuzsa Tóvölgyi ◽  
József Varga ◽  
Lajos Botz ◽  
...  
Keyword(s):  
Specific Interactions ◽  
Structure And Properties ◽  
Segmented Polyurethane ◽  
Polyurethane Elastomers ◽  
Nanophase Separation

Quantitative estimation of the strength of specific interactions in polyurethane elastomers, and their effect on structure and properties

2012 ◽  
Vol 48 (11) ◽  
pp. 1854-1865 ◽  
Author(s):  
Kristóf Bagdi ◽  
Kinga Molnár ◽  
Mihály Kállay ◽  
Peter Schön ◽  
Julius G. Vancsó ◽  
...  
Keyword(s):  
Quantitative Estimation ◽  
Specific Interactions ◽  
Structure And Properties ◽  
Polyurethane Elastomers

Special features of the structure and properties of segmented oligodiene polyurethane elastomers with rigid segments of different structure

1990 ◽  
Vol 32 (5) ◽  
pp. 955-960 ◽  
Author(s):  
Yu.Yu. Keercha ◽  
S.P. Oleinik ◽  
L.A. Shelkovnikova ◽  
L.I. Dashevskii ◽  
V.A. Bogdanovich
Keyword(s):  
Structure And Properties ◽  
Polyurethane Elastomers

The effect of castor oil on the structure and properties of polyurethane elastomers

1992 ◽  
Vol 44 (8) ◽  
pp. 1343-1347 ◽  
Author(s):  
P. K. Saxena ◽  
S. R. Srinivasan ◽  
J. Hrouz ◽  
M. Ilavský
Keyword(s):  
Castor Oil ◽  
Structure And Properties ◽  
Polyurethane Elastomers
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