Properties of low molecular weight block copolymers. 4. Differential scanning calorimetry and refractive index-temperature measurement on styrene-butadiene diblock copolymers and styrene-butadiene-styrene triblock copolymers

1982 ◽  
Vol 15 (4) ◽  
pp. 1076-1082 ◽  
Author(s):  
Sonja Krause ◽  
Zhonghe Lu ◽  
Magdy Iskandar
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Refractive Index ◽  
Diblock Copolymers ◽  
Triblock Copolymers ◽  
Low Molecular Weight ◽  
Scanning Calorimetry ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

scholarly journals THE MICELLIZATION OF PLURONICS (PEO-PPO-PEO TRIBLOCK COPOLYMERS)

2009 ◽  
Vol 12 (3) ◽  
pp. 85-94
Author(s):  
Hung Quoc Nguyen ◽  
Søren Hvidt ◽  
Walther Batsberg ◽  
Cuong Ngoc Hoang
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Triblock Copolymers ◽  
Low Molecular Weight ◽  
Hexane Extraction ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Effects Of Temperature ◽  
Molecular Weight Fractions ◽  
Dsc Thermograms

The micellization of several Pluronics (PEO-PPO-PEO triblock copolymers) was investigated by Differential Scanning Calorimetry (DSC). These copolymers were also characterized and purified by liquid chromatography. The PEO/PPO compositions of Pluronics were determined by 'H-NMR. The thermograms from DSC showed a pre micellization shoulder for L81 and L121 solutions. The effects of temperature, PO/EO ratios and impurities on the micellization of copolymers were investigated. The origin of the shoulders in DSC thermograms was shown to be due to the most hydrophobic components in the copolymers, which could be removed by hexane extraction. Low molecular weight fractions of the copolymers were separated by interaction chromatography. The low molecular weight fractions did not contribute to the micellization of the copolymers.

Viscoelastic Behavior of Styrene-Butadiene-Styrene Block Copolymers in Temperature Range of Glass-Rubber Transition of Styrene Block

1996 ◽  
Vol 69 (1) ◽  
pp. 73-80 ◽  
Author(s):  
N. Nakajima
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Viscoelastic Behavior ◽  
Shear Mode ◽  
Molecular Weight Polymer ◽  
Styrene Butadiene Styrene ◽  
The Difference ◽  
Tan Δ ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Abstract Dynamic mechanical measurements were performed with styrene-butadiene-styrene (SBS) block copolymers, Kraton D-1101 and D-l 102. Isochronal data were obtained from −130 to 85°C in the tensile mode at 1 Hz and from 60 to 160°C in the shear mode at 1 rad/s. The isothermal measurements were also performed at 60, 90, 120, 140, and 160°C in the frequency range of 0.0316 to 100 rad/s. The results suggest that the two polymers have different morphologies although the styrene content and the diblock content are about the same for both polymers. Kraton D-1101, which has 1.5 times higher molecular weight, has 3–5 times higher rubbery modulus, compared to D-1102. The lower molecular weight polymer, D-1102, appears to have a larger amount of the mixed phase at the boundary. This is suggest by the lower temperature of the “domain disruption”, Tdd and the higher magnitude of tan δ at Tdd. This explains the difference in the rubbery moduli of the two polymers.

High-frequency ultrasonic studies of solutions of styrene-butadiene-styrene triblock copolymers

Polymer ◽  
1989 ◽  
Vol 30 (8) ◽  
pp. 1484-1487 ◽  
Author(s):  
Keiichiro Adachi ◽  
David Hayward ◽  
Gloria Tardajos ◽  
Richard A. Pethrick
Keyword(s):  
High Frequency ◽  
Triblock Copolymers ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Influence of chain architecture on phase behaviour of styrene-(styrene/butadiene)-styrene triblock copolymers and their binary blends

2009 ◽  
Vol 45 (2) ◽  
pp. 537-549 ◽  
Author(s):  
Mahendra Thunga ◽  
Bhabani K. Satapathy ◽  
Roland Weidisch ◽  
Manfred Stamm ◽  
Jens U. Sommer ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Phase Behaviour ◽  
Binary Blends ◽  
Chain Architecture ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene
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