scholarly journals Electroinitiated Polyesters from Phthalic Anhydride and Propylene Oxide

1973 ◽  
Vol 5 (1) ◽  
pp. 105-106 ◽  
Author(s):  
Richard A Wallace ◽  
N V Vijayaraghavan
Keyword(s):  
Phthalic Anhydride ◽  
Propylene Oxide

Performance tailorable terpolymers synthesized from carbon dioxide, phthalic anhydride and propylene oxide using Lewis acid-base dual catalysts

2021 ◽  
Vol 49 ◽  
pp. 101558
Author(s):  
Jiaxin Liang ◽  
Shuxian Ye ◽  
Wenjing Wang ◽  
Congxiao Fan ◽  
Shuanjin Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Lewis Acid ◽  
Phthalic Anhydride ◽  
Propylene Oxide ◽  
Acid Base

scholarly journals Copolymerization and terpolymerization of carbon dioxide/propylene oxide/phthalic anhydride using a (salen)Co(III) complex tethering four quaternary ammonium salts

2014 ◽  
Vol 10 ◽  
pp. 1787-1795 ◽  
Author(s):  
Jong Yeob Jeon ◽  
Seong Chan Eo ◽  
Jobi Kodiyan Varghese ◽  
Bun Yeoul Lee
Keyword(s):  
Molecular Weight ◽  
High Activity ◽  
Phthalic Anhydride ◽  
Propylene Oxide ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Alternating Copolymer ◽  
Highly Active ◽  
Full Conversion

The (salen)Co(III) complex 1 tethering four quaternary ammonium salts, which is a highly active catalyst in CO2/epoxide copolymerizations, shows high activity for propylene oxide/phthalic anhydride (PO/PA) copolymerizations and PO/CO2/PA terpolymerizations. In the PO/PA copolymerizations, full conversion of PA was achieved within 5 h, and strictly alternating copolymers of poly(1,2-propylene phthalate)s were afforded without any formation of ether linkages. In the PO/CO2/PA terpolymerizations, full conversion of PA was also achieved within 4 h. The resulting polymers were gradient poly(1,2-propylene carbonate-co-phthalate)s because of the drift in the PA concentration during the terpolymerization. Both polymerizations showed immortal polymerization character; therefore, the molecular weights were determined by the activity (g/mol-1) and the number of chain-growing sites per 1 [anions in 1 (5) + water (present as impurity) + ethanol (deliberately fed)], and the molecular weight distributions were narrow (M w/M n, 1.05–1.5). Because of the extremely high activity of 1, high-molecular-weight polymers were generated (M n up to 170,000 and 350,000 for the PO/PA copolymerization and PO/CO2/PA terpolymerization, respectively). The terpolymers bearing a substantial number of PA units (f PA, 0.23) showed a higher glass-transition temperature (48 °C) than the CO2/PO alternating copolymer (40 °C).

Initial Studies of a Potent Antiheparin Agent (Ubiquin®)

1968 ◽  
Vol 20 (03/04) ◽  
pp. 588-595 ◽  
Author(s):  
E. B Goodsell ◽  
R. A Krause ◽  
E. T Kimura
Keyword(s):  
Side Effects ◽  
Acute Toxicity ◽  
Propylene Oxide ◽  
Toluidine Blue ◽  
Water Soluble ◽  
Per Se

SummaryUbiquin (oligo-3-(N-methylmorpholinium)-l,2-propylene oxide chloride) is a stable, water soluble, active heparin antagonist producing prompt neutralization when administered in a 1:1 ratio to rats and dogs. Initial studies indicate that it is devoid of any effect on coagulation per se; nor are there any obvious side effects manifested during the process of neutralization. The acute toxicity is less than that of other compounds in use: toluidine blue, protamine and hexadimethrine.

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