Formyl-Ended Heterobifunctional Poly(ethylene oxide): Synthesis of Poly(ethylene oxide) with a Formyl Group at One End and a Hydroxyl Group at the Other End

1995 ◽  
Vol 6 (2) ◽  
pp. 231-233 ◽  
Author(s):  
Yukio Nagasaki ◽  
Takahiko Kutsuna ◽  
Michihiro Iijima ◽  
Masao Kato ◽  
Kazunori Kataoka ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
The Other ◽  
Hydroxyl Group ◽  
Formyl Group ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Mesoscopic simulation of the self-assembly of the weak polyelectrolyte poly(ethylene oxide)-block-poly(methyl methacrylate) diblock copolymers

Soft Matter ◽  
2015 ◽  
Vol 11 (22) ◽  
pp. 4366-4374 ◽  
Author(s):  
Dan Mu ◽  
Jian-Quan Li ◽  
Sheng-Yu Feng
Keyword(s):  
Ethylene Oxide ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
The Self ◽  
The Other ◽  
Mesoscopic Simulation ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The Right ◽  
Weak Polyelectrolytes

We designed twelve types of weak polyelectrolytes (i.e., PEO-b-PMMA copolymers (BCP) in multi-arm structures, where six include EO blocks as joint points and the other six have MMA blocks as joint points). Of these, six are displayed; structures with EO blocks as joint points on the left, and those with MMA blocks as joint points on the right.

scholarly journals Time-dependence of the electromechanical bending actuation observed in ionic-electroactive polymers

2017 ◽  
Vol 07 (02) ◽  
pp. 1720002 ◽  
Author(s):  
Patrick S. Bass ◽  
Lin Zhang ◽  
Z.-Y. Cheng
Keyword(s):  
Ethylene Oxide ◽  
Time Dependence ◽  
Lithium Perchlorate ◽  
Electroactive Polymers ◽  
The Other ◽  
Electroactive Polymer ◽  
Different Temperatures ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Reasonable Model

The characteristics of the electromechanical response observed in an ionic-electroactive polymer (i-EAP) are represented by the time ([Formula: see text]) dependence of its bending actuation ([Formula: see text]). The electromechanical response of a typical i-EAP — poly(ethylene oxide) (PEO) doped with lithium perchlorate (LP) — is studied. The shortcomings of all existing models describing the electromechanical response obtained in i-EAPs are discussed. A more reasonable model: [Formula: see text] is introduced to characterize this time dependence for all i-EAPs. The advantages and correctness of this model are confirmed using results obtained in PEO-LP actuators with different LP contents and at different temperatures. The applicability and universality of this model are validated using the reported results obtained from two different i-EAPs: one is Flemion and the other is polypyrrole actuators.

Synthesis of ABC Star-Shaped Copolymers via a Combination of Controlled Polymerization Techniques

2011 ◽  
Vol 311-313 ◽  
pp. 1161-1167
Author(s):  
Xiao Bing Wang ◽  
Peng Fu ◽  
Min Ying Liu ◽  
Jian Wei Zhang ◽  
Qing Xiang Zhao
Keyword(s):  
Ethylene Oxide ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Proton Nuclear Magnetic Resonance ◽  
Hydroxyl Group ◽  
Controlled Polymerization ◽  
Star Copolymers ◽  
Poly Ethylene Oxide ◽  
Miktoarm Star ◽  
Poly Ethylene

Two kinds of ABC-type miktoarm star copolymers, poly(α-methylstyrene)-poly(ethylene oxide)-poly(ethoxyethyl glycidylether) (PMS-PEO-PEEGE) and poly(α-methylstyrene)-poly(ethylene oxide)-polyglycidol (PMS-PEO-PG), were synthesized via a combination of anionic polymerization with ring-opening polymerization. Firstly, The poly(α-methyl styryl lithium) (PMS－Li+) was capped by EEGE to form the functionalized poly(α-methylstyrene) with both an active ω-hydroxyl group and an ω’-ethoxyethyl-protected hydroxyl group. Secondly, the PMS-b-PEO block copolymers, star(PMS-PEO-PEEGE) and star(PMS-PEO-PG) copolymers were obtained by the ring-opening polymerization of EO and EEGE via the variation of the functional end group, respectively. Finally, the ethoxyethyl group on the PEEGE arm was hydrolyzed. The obtained miktoarm star copolymers and intermediates were characterized by proton nuclear magnetic resonance (1H-NMR) and size exclusion chromatography (SEC).

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

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