Properties of low molecular weight block copolymers. 2. Refractive index-temperature measurements of styrene-dimethylsiloxane diblock copolymers

1982 ◽  
Vol 15 (1) ◽  
pp. 112-114 ◽  
Author(s):  
Zhong He Lu ◽  
Sonja Krause
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Block Copolymers ◽  
Diblock Copolymers ◽  
Temperature Measurements ◽  
Low Molecular Weight

Block Copolymers Poly(2,6-dimethyl-1,4-phenylene oxide)-poly(6-hexanelactam). Preparation and Composition

1993 ◽  
Vol 58 (11) ◽  
pp. 2574-2582 ◽  
Author(s):  
Jaroslav Stehlíček ◽  
Rudolf Puffr
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Diblock Copolymer ◽  
Anionic Polymerization ◽  
Diblock Copolymers ◽  
Toluene Solution ◽  
Low Molecular Weight ◽  
Phenylene Oxide ◽  
End Groups ◽  
Tolylene Diisocyanate

Poly(2,6-dimethyl-1,4-phenylene oxide)-poly(6-hexanelactam) diblock copolymers were prepared from low-molecular weight poly(2,6-dimethyl-1,4-phenylene oxide) by transforming its phenolic end groups via the reaction with 2,4-tolylene diisocyanate and 6-hexanelactam to polymeric initiators and the subsequent anionic polymerization of 6-hexanelactam. The polymerization of 6-hexanelactam was carried out in bulk or toluene solution. The content of the 6-hexanelactam homopolymer was estimated by TLC showing that the pure diblock copolymer can be prepared in toluene. The reason for relatively low yields is discussed.

scholarly journals Low Molecular Weight pDMAEMA-block-pHEMA Block-Copolymers Synthesized via RAFT-Polymerization: Potential Non-Viral Gene Delivery Agents?

Polymers ◽  
2011 ◽  
Vol 3 (2) ◽  
pp. 693-718 ◽  
Author(s):  
Olga Samsonova ◽  
Christian Pfeiffer ◽  
Markus Hellmund ◽  
Olivia M. Merkel ◽  
Thomas Kissel
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Gene Delivery ◽  
Raft Polymerization ◽  
Viral Gene ◽  
Low Molecular Weight ◽  
Viral Gene Delivery

Miscibility of Starch and Low Molecular Weight Poly (ethyleneglycol) Blends in Aqueous Medium

2016 ◽  
Vol 15 (2) ◽  
pp. 45-56
Author(s):  
Sumana V S ◽  
Sudhakar Y N
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Aqueous Medium ◽  
Low Molecular Weight ◽  
Density Data ◽  
Viscosity Polymer ◽  
Polymer Interaction

The miscibility of starch and poly(ethyleneglycol) (PEG)blends in water were investigated by viscosity, densityand refractive index studies. The physical interactionparameters like poly-solvent and blend-solvent have beencalculated using viscosity and density data. Starch/PEGblends were found to be miscible in all studied ratios. Thestudy also revealed that variation of temperature does notaffect the miscibility of starch and PEG blends in theaqueous solution significantly. The miscibility occurs dueto presence of hydroxyl-hydroxyl interactions in theblends. The result obtained reveals that PEG can beeffectively used as gelating agent in starch solution.Keywords: Miscibility, viscosity, polymer interaction, starch, PEG

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