scholarly journals The Influence of Crown Ether and Alcohol on Unsaturation and Molar Mass of Poly(propylene oxide)s Prepared by Use of Potassiumt-Butoxide: Reinvestigation of Chain Transfer Reactions

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Zbigniew Grobelny ◽  
Andrzej Swinarew ◽  
Justyna Jurek-Suliga ◽  
Kinga Skrzeczyna ◽  
Jadwiga Gabor ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Room Temperature ◽  
Molar Mass ◽  
Chain Transfer ◽  
Macrocyclic Ligand ◽  
Transfer Reactions ◽  
Simultaneous Decrease ◽  
Poly Propylene ◽  
Homogeneous Polymerization ◽  
Distinct Increase

Potassiumt-butoxide dissolved in tetrahydrofuran effectively initiates homogeneous polymerization of propylene oxide at room temperature. Unsaturation and molar mass (Mn) of the polymers prepared depend on the presence of additives, such as macrocyclic ligand 18-crown-6 (L) andt-butanol. Application of the ligand alone results in distinct increase of unsaturation and decrease ofMn, whereas use oft-BuOH leads to simultaneous decrease of unsaturation andMn. Activation oft-BuOK/t-BuOH system with the ligand causes further decrease of unsaturation, that is, from 12.0 to 3.5 mol % for OK/OH (1/3) and OK/OH/L (1/3/2) systems, respectively. Unexpectedly,Mnof the polymers obtained does not practically change (~4800). This result differs from that reported earlier for neat PO polymerization initiated potassium 1-methoxy-2-propoxide/1-methoxy-2-propanol, in which in the presence of the same ligandMnincreases to ~12 400 for the same ratio of reagents. The mechanism of studied processes was discussed.

scholarly journals The influence of initiator and macrocyclic ligand on unsaturation and molar mass of poly(propylene oxide)s prepared with various anionic system

2017 ◽  
Vol 75 (3) ◽  
pp. 1101-1121 ◽  
Author(s):  
Zbigniew Grobelny ◽  
Marek Matlengiewicz ◽  
Justyna Jurek-Suliga ◽  
Sylwia Golba ◽  
Kinga Skrzeczyna
Keyword(s):  
Propylene Oxide ◽  
Molar Mass ◽  
Macrocyclic Ligand ◽  
Poly Propylene

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.

Application of Dipotassium Glycoxides–Activated 18-Crown-6 for the Synthesis of Poly(propylene oxide) with Increased Molar Mass

2014 ◽  
Vol 20 (3) ◽  
pp. 206-222 ◽  
Author(s):  
Zbigniew Grobelny ◽  
Marek Matlengiewicz ◽  
Sylwia Golba ◽  
Justyna Jurek-Suliga ◽  
Andrzej S. Swinarew ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Molar Mass ◽  
Poly Propylene

Influence of chain transfer reactions on the molar mass distribution of polybutadiene synthesized in the presence of a bimetallic NaAl organic initiator

1989 ◽  
Vol 31 (9) ◽  
pp. 2057-2064 ◽  
Author(s):  
M.A. Yeremina ◽  
Ye.G. Erenburg ◽  
A.S. Skornyakov ◽  
I.I. Yermakova ◽  
V.K. Vasil'ev ◽  
...  
Keyword(s):  
Mass Distribution ◽  
Molar Mass ◽  
Chain Transfer ◽  
Transfer Reactions ◽  
Molar Mass Distribution

Aqueous Solution Properties of Polyglycidol-Based Analogues of Pluronic Copolymers. Influence of the Poly(propylene oxide) Block Molar Mass

2010 ◽  
Vol 43 (2) ◽  
pp. 772-781 ◽  
Author(s):  
Silvia Halacheva ◽  
Stanislav Rangelov ◽  
Christo Tsvetanov ◽  
Vasil M. Garamus
Keyword(s):  
Aqueous Solution ◽  
Propylene Oxide ◽  
Molar Mass ◽  
Solution Properties ◽  
Poly Propylene

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.

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