Segmented block copolymers of natural rubber and propylene glycol-toluene diisocyanate oligomers

1998 ◽  
Vol 38 (3) ◽  
pp. 440-451 ◽  
Author(s):  
C. J. Paul ◽  
M. R. Gopinathan Nair ◽  
N. R. Neelakantan ◽  
Peter Koshy
Keyword(s):  
Block Copolymers ◽  
Natural Rubber ◽  
Propylene Glycol ◽  
Toluene Diisocyanate

Segmented block copolymers of natural rubber and 1, 3-butanediol–toluene diisocyanate oligomers

Polymer ◽  
1998 ◽  
Vol 39 (26) ◽  
pp. 6861-6874 ◽  
Author(s):  
C.J. Paul ◽  
M.R. Gopinathan Nair ◽  
N.R. Neelakantan ◽  
Peter Koshy ◽  
Bhaskar B. Idage ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Natural Rubber ◽  
Toluene Diisocyanate

Plasticization of polylactide with block copolymers of ethylene glycol and propylene glycol

2012 ◽  
Vol 125 (6) ◽  
pp. 4292-4301 ◽  
Author(s):  
Marcin Kowalczyk ◽  
Miroslaw Pluta ◽  
Ewa Piorkowska ◽  
Nelli Krasnikova
Keyword(s):  
Block Copolymers ◽  
Ethylene Glycol ◽  
Propylene Glycol

scholarly journals Organosilica-Modified Multiblock Copolymers for Membrane Gas Separation

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3579
Author(s):  
Ilsia M. Davletbaeva ◽  
Alexander Yu. Alentiev ◽  
Zulfiya Z. Faizulina ◽  
Ilnaz I. Zaripov ◽  
Roman Yu. Nikiforov ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Toluene Diisocyanate ◽  
Multiblock Copolymers ◽  
Gas Solubility ◽  
Membrane Gas Separation ◽  
Modified Polymers ◽  
Temperature Relaxation ◽  
Solubility Coefficients ◽  
Modified Block ◽  
The Ideal

Organosubstituted silica derivatives were synthesized and investigated as modifiers of block copolymers based on macroinitiator and 2,4-toluene diisocyanate. A peculiarity of the modified block copolymers is the existence in their structure of coplanar rigid polyisocyanate blocks of acetal nature (O-polyisocyanates). Organosubstituted silica derivatives have a non-additive effect on high-temperature relaxation and α-transitions of modified polymers and exhibit the ability to influence the supramolecular structure of block copolymers. The use of the developed modifiers leads to a change in the gas transport properties of block copolymers. The increase of the permeability coefficients is due to the increase of the diffusion coefficients. At the same time, the gas solubility coefficients do not change. An increase in the ideal selectivity for a number of gas pairs is observed. An increase in the selectivity for the CO2/N2 gas pair (from 25 to 39) by 1.5 times demonstrates the promising use of this material for flue gases separation.

Structural studies on transition metal ion complexes of polyethylene oxide-natural rubber block copolymers

2019 ◽  
Vol 26 (8) ◽  
Author(s):  
M. S. Mrudula ◽  
Nidhi Tiwari ◽  
Shambhu Nath Jha ◽  
Dibyendu Bhattacharyya ◽  
M. R. Gopinathan Nair
Keyword(s):  
Block Copolymers ◽  
Transition Metal ◽  
Natural Rubber ◽  
Polyethylene Oxide ◽  
Metal Ion ◽  
Structural Studies ◽  
Metal Ion Complexes ◽  
Transition Metal Ion ◽  
Rubber Block

scholarly journals Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate

Membranes ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 42 ◽  
Author(s):  
Ilsiya M. Davletbaeva ◽  
Ilnaz I. Zaripov ◽  
Alexander I. Mazilnikov ◽  
Ruslan S. Davletbaev ◽  
Raphael R. Sharifullin ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Gas Separation ◽  
Gas Transport ◽  
Toluene Diisocyanate ◽  
Great Promise ◽  
Internal Cavity ◽  
Polar Molecules ◽  
Supramolecular Organization ◽  
Membrane Gas Separation ◽  
Separation Membranes

Nowadays, block copolymers hold great promise for the design of novel membranes to be applied for the membrane gas separation. In this regard, microporous block copolymers based on a macroinitiator with an anionic nature, such as potassium-substituted block copolymers of propylene oxide and ethylene oxide (PPEG) and 2,4-toluene diisocyanate (TDI), were obtained and investigated as effective gas separation membranes. The key element of the macromolecular structure that determines the supramolecular organization of the studied polymers is the coplanar blocks of polyisocyanates with an acetal nature (O-polyisocyanate). In the present research, the influence of the content of peripheral polyoxyethylene (POE) blocks in PPEG on the supramolecular structure processes and gas transport characteristics of the obtained polymers based on PPEG and TDI was investigated. According to the study of polymers if the POE block content is 15 wt %, the polyoxypropylene segments are located in the internal cavity of voids formed by O-polyisocyanate blocks. When the POE block content is 30 wt %, the flexible chain component forms its own microphase outside the segregation zone of the rigid O-polyisocyanate blocks. The permeability for polar molecules, such as ammonia or hydrogen sulfide, significantly exceeds the permeability values obtained for non-polar molecules He, N2 and СН4. A relatively high permeability is also observed for carbon dioxide. At the same time, the content of POE blocks has a small effect on the permeability for all studied gases. The diffusion coefficient increases with an increase in the POE block content in PPEG for all studied gases.

Segmented block copolymers based on liquid natural rubber

1991 ◽  
Vol 42 (2) ◽  
pp. 325-333 ◽  
Author(s):  
T. Ravindran ◽  
M. R. Gopinathan Nayar ◽  
D. Joseph Francis
Keyword(s):  
Block Copolymers ◽  
Natural Rubber ◽  
Liquid Natural Rubber
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