Model polyurethane elastomers prepared from noncrystallizable poly(propylene oxide) chains

1981 ◽  
Vol 19 (3) ◽  
pp. 507-515 ◽  
Author(s):  
P.-H. Sung ◽  
J. E. Mark
Keyword(s):  
Propylene Oxide ◽  
Polyurethane Elastomers ◽  
Poly Propylene

Chain Extension Studies Relevant to the Completeness of End-Linking in Elastomeric Polyurethane Networks

1982 ◽  
Vol 55 (5) ◽  
pp. 1464-1468 ◽  
Author(s):  
J. E. Mark ◽  
P. H. Sung
Keyword(s):  
Propylene Oxide ◽  
Relevant Information ◽  
Polymer Chains ◽  
Chain Extension ◽  
Polyurethane Elastomers ◽  
Molecular Weights ◽  
Before And After ◽  
End Linking ◽  
Poly Propylene

Abstract Polyurethane elastomers may be prepared by end-linking hydroxyl-terminated (atactic) poly(propylene oxide) chains with an aromatic triisocyanate. As is invariably the case, networks thus formed are insoluble and very difficult to analyze with regard to the completeness of the end-linking reaction. Relevant information can, however, be obtained by studying the products of the analogous reaction, between a structurally similar diisocyanate and the same polymer chains, under identical conditions. Since both reactants now have functionalities less than three, the reaction gives chain extension rather than crosslinking (gelation), and it is now possible to measure molecular weights before and after the reaction. Such experiments were carried out using diphenylmethane-4,4′-diisocyanate with poly(propylene oxide) chains which had viscosity-average molecular weights ranging from 10−3Mv=1.15−4.50 g mol−1. Values of Mv were found to increase by factors of 20–30, which indicates high extents of reaction. These results are relevant with regard to the probable efficiency of polyurethane curing techniques, and also for the characterization of “model” networks used in the quantitative evaluation of the molecular theories of rubberlike elasticity.

scholarly journals Heterotelechelic poly(propylene oxide) as migration-inhibited toughening agent in hot lithography based additive manufacturing

2021 ◽  
Vol 12 (9) ◽  
pp. 1260-1272
Author(s):  
Daniel Grunenberg ◽  
Katharina Ehrmann ◽  
Christian Gorsche ◽  
Bernhard Steyrer ◽  
Thomas Koch ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Propylene Oxide ◽  
Chain Transfer ◽  
Poly Propylene ◽  
Toughening Agent

Linking an addition–fragmentation-chain-transfer (AFCT) functionality and methacrylate moiety via poly(propylene oxide)-oligomer within one molecule creates a non-migrating AFCT-reagent aiding network-homogeneity.

Chiral salenCo(iii) complexes with bulky substituents as catalysts for stereoselective alternating copolymerization of racemic propylene oxide with carbon dioxide and succinic anhydride

2021 ◽  
Vol 12 (12) ◽  
pp. 1776-1786
Author(s):  
Zhou Wang ◽  
Ying Mu
Keyword(s):  
Carbon Dioxide ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Succinic Anhydride ◽  
Poly Propylene ◽  
Alternating Copolymerization

Stereoregular poly(propylene carbonate)s and poly(propylene succinate-block-carbonate)s were synthesized with new chiral salenCo(iii) catalysts carrying bulky substituents.

scholarly journals Fabrication and characterization of the ternary composite catalyst system of ZnGA/RET/DMC for the terpolymerization of CO2, propylene oxide and trimellitic anhydride

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8782-8792
Author(s):  
Ningzhang Liu ◽  
Chuanhai Gu ◽  
Qinghe Wang ◽  
Linhua Zhu ◽  
Huiqiong Yan ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Ternary Complex ◽  
Catalyst System ◽  
Composite Catalyst ◽  
Trimellitic Anhydride ◽  
Ternary Composite ◽  
Metal Cyanide ◽  
Fabrication And Characterization ◽  
Poly Propylene

For poly(propylene carbonate trimellitic anhydride) with good yield, thermal stability and high molecular weight, a catalyst of zinc glutarate/rare earth ternary complex/double metal cyanide was used for terpolymerization of CO2, propylene oxide and trimellitic anhydride.

Carbon-13 NMR determination of poly(propylene oxide) microstructure

1986 ◽  
Vol 19 (5) ◽  
pp. 1337-1343 ◽  
Author(s):  
Frederic C. Schilling ◽  
Alan E. Tonelli
Keyword(s):  
Propylene Oxide ◽  
Poly Propylene

NMR study of a poly(propylene oxide)-NaCF3SO3 polymer electrolyte

1990 ◽  
Vol 40-41 ◽  
pp. 645-647 ◽  
Author(s):  
S SCHANTZ ◽  
M KAKIHANA ◽  
M SANDBERG
Keyword(s):  
Polymer Electrolyte ◽  
Propylene Oxide ◽  
Nmr Study ◽  
Poly Propylene
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