A study of the molecular weights of tetrahydrofuran–propylene oxide copolymers by gel permeation chromatography and other methods

Blanchard, L. P.; Baijal, M. D.

doi:10.1002/pol.1967.150050821

Cited by 20 publications

(4 citation statements)

References 8 publications

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“…These copolymers are more hydrophilic than PPO homopolymers and may show improved, but still limited solubility in water. Furthermore, copolymers of PO with tetrahydrofuran have been reported 6 that exhibit reduced coldhardening and improved molding properties when used as a soft segment in PUs.…”

Section: ■ Introductionmentioning

confidence: 99%

Water-Soluble “Poly(propylene oxide)” by Random Copolymerization of Propylene Oxide with a Protected Glycidol Monomer

Schömer

Frey

2012

Macromolecules

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Hydrophilic, functional poly(propylene oxide) (PPO) copolymers were prepared by anionic random copolymerization of propylene oxide with the protected glycidyl derivative ethoxy ethyl glycidyl ether (EEGE). The monobenzyl-protected ethylene glycol initiator 2-(benzyloxy)ethanol was used to initiate the polymerization because it allows for the introduction of hydroxyl groups at both ends of the polymer chain. Acidic deprotection permitted selective removal of the acetal protecting groups in the chain or alternatively orthogonal deprotection of the terminal hydroxyl group by catalytic hydrogenation. A series of narrowly distributed hydroxyl-functional PPO copolymers (M w /M n < 1.07−1.25 g mol −1 ) was obtained with varying composition between 2 and 75% glycerol units and molecular weights in the range of 3000 to 8000 g mol −1 . Monomer consumption and compositional drift in monomer feed were studied via 1 H NMR kinetics, revealing a slightly tapered structure, but confirmed a distribution of EEGE in the polar PPO-based copolymers. Cloud-point measurements showed temperature-dependent water solubility, with LCSTs in the range of 20 to 70 °C. The study demonstrates that an incorporation of 11% of the hydroxyl-functional, linear glycerol units suffices to obtain functional PPO copolymers that are water-soluble at room temperature.

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Section: ■ Introductionmentioning

confidence: 99%

Water-Soluble “Poly(propylene oxide)” by Random Copolymerization of Propylene Oxide with a Protected Glycidol Monomer

Schömer

Frey

2012

Macromolecules

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“…Polymer degradation has been studied using GPC to measure product distribution and gain information on reaction mechanisms ( 100). An analysis of the GPC curves of copolymers of tetrahydrofuran and propylene oxide detected the presence of two peaks, apparently related to the method of preparation (27).…”

Section: )mentioning

confidence: 99%

Rubber

Wadelin¹,

Trick²

1969

Anal. Chem.

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The characterization and chemical analysis of rubber are covered by this review. Methods are included for the identification and determination of rubber or materials in rubber. Analysis of rubber chemicals before they are added to rubber is not included.The literature on chemical analysis which became available to the authors between September 1966, the end of the period covered by the last review in the series (212), and July 1968 is covered. The section on polymer characterization by physical methods includes material up to September 1968.

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“…chard and Baijal, 1967;Blanchard et al, 1966;Eastham, 1963;Furukawa and Saegusa, 1963; Kennedy, 1964; St. Pierre, 1963) on the cationic polymerization of epoxides other than styrene oxide.…”

mentioning

confidence: 99%

“…To fill this need, and also to complement similar studies (Baijal and Blanchard, 1968;Blanchard and Baijal, 1967;Blanchard et al, 1966) on tetrahydrofuran-propylene oxide (which are in an advanced stage in this laboratory), a project on the cationic polymerization of styrene oxide was pursued. Kinetic and molecular characterizations of this system are discussed in this paper.…”

mentioning

confidence: 99%