Synthesis of polyacetals with various main-chain structures by the self-polyaddition of vinyl ethers with a hydroxyl function

2002 ◽  
Vol 40 (22) ◽  
pp. 4053-4064 ◽  
Author(s):  
Tamotsu Hashimoto ◽  
Koji Ishizuka ◽  
Akihiro Umehara ◽  
Toshiyuki Kodaira
Keyword(s):  
Main Chain ◽  
The Self ◽  
Vinyl Ethers

Polyaddition of vinyl ethers and phthalaldehydes via successive cyclotrimerization reactions: selective model reactions and synthesis of acid-degradable linear poly(cyclic acetal)s

2019 ◽  
Vol 10 (11) ◽  
pp. 1377-1385
Author(s):  
Tadashi Naito ◽  
Arihiro Kanazawa ◽  
Sadahito Aoshima
Keyword(s):  
Lewis Acid ◽  
Main Chain ◽  
Acid Catalyst ◽  
Vinyl Monomer ◽  
Cyclic Acetal ◽  
Vinyl Ethers ◽  
Linear Poly ◽  
Lewis Acid Catalyst ◽  
Model Reactions

A polyaddition via the cyclotrimerization of one vinyl monomer and two conjugated dialdehydes proceeded using a Lewis acid catalyst, yielding a polymer with cyclic acetal structures in the main chain.

Absolute rate constants for hydrocarbon autoxidation. V. The hydroperoxy radical in chain propagation and termination

1967 ◽  
Vol 45 (8) ◽  
pp. 785-792 ◽  
Author(s):  
J. A. Howard ◽  
K. U. Ingold
Keyword(s):  
Rate Constants ◽  
Main Chain ◽  
Aqueous Media ◽  
Chain Termination ◽  
The Self ◽  
Absolute Rate ◽  
Nonpolar Solvents ◽  
Hydroperoxy Radical ◽  
Absolute Rate Constant ◽  
Chain Propagation And Termination

The hydroperoxy radical (HOO·) is the main chain propagating and terminating radical in the autoxidation of dilute solutions of 1,4-cyclohexadiene and 1,4-dihydronaphthalene in chlorobenzene at 30 °C. The absolute rate constant for the self-reaction of hydroperoxy radicals (chain termination) in nonpolar solvents is very much higher than previously reported values in aqueous media.

Hierarchical superstructures of norbornene-based polymers depending on dendronized side-chains

2016 ◽  
Vol 7 (33) ◽  
pp. 5304-5311 ◽  
Author(s):  
Dae-Yoon Kim ◽  
Dong-Gue Kang ◽  
Suyong Shin ◽  
Tae-Lim Choi ◽  
Kwang-Un Jeong
Keyword(s):  
Self Assembly ◽  
Ring Opening ◽  
Main Chain ◽  
The Self ◽  
Side Chain ◽  
Side Chains ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
Main Chain Polymers

For understanding the self-assembly behaviours of norbornene-based main-chain polymers depending on side-chain pendants, a series of polynorbornenes containing the programmed dendrons is newly designed and successfully synthesized via ring opening metathesis polymerization.

Sequence-controlled degradable polymers by controlled cationic copolymerization of vinyl ethers and aldehydes: precise placement of cleavable units at predetermined positions

2015 ◽  
Vol 6 (22) ◽  
pp. 4102-4108 ◽  
Author(s):  
Marie Kawamura ◽  
Arihiro Kanazawa ◽  
Shokyoku Kanaoka ◽  
Sadahito Aoshima
Keyword(s):  
Main Chain ◽  
Degradable Polymers ◽  
Vinyl Ethers ◽  
Cationic Copolymerization

Sequence-controlled degradable polymers with precisely placed breakable bonds in the main chain were synthesized by controlled alternating cationic copolymerization of vinyl ethers and aldehydes.

Trasmittance Self-Oscillating Behavior of a Non-Thermoresponsive Polymer Chain Induced by the Belouzov-Zhabotinsky (BZ) Reaction

2011 ◽  
Vol 480-481 ◽  
pp. 369-374 ◽  
Author(s):  
Yusuke Hara
Keyword(s):  
Polymer Chain ◽  
Main Chain ◽  
Ruthenium Catalyst ◽  
The Self ◽  
Thermoresponsive Polymer ◽  
Bz Reaction ◽  
Covalently Bonded ◽  
Selection Of

In this study, the influence of the temperature on the transmittance self-oscillation of a non-thermoresponsive polymer chain was investigated. The polymer chain was composed of a biocompatible and non-thermoresponsive poly-vinylpyrrolidone (PVP) main-chain covalently-bonded to the 10 wt% ruthenium catalyst moiety (Ru(bpy)3) of the BZ reaction. As a result, the amplitude of the transmittance self-oscillation slightly decreased with the increase in the temperature. The period of the transmittance self-oscillation decreased with increasing the temperature in accordance with the Arrenius equation. Therefore, the period of the self-oscillation can be controlled by the selection of the temperature.

scholarly journals Synthesis and Study of the Properties of Amphiphilic Poly-N-Vinylpyrrolidone with Terminal Thioalkyl Groups

2019 ◽  
pp. 258-265
Author(s):  
Mikhail I. Shtilman ◽  
Andrey N. Kuskov ◽  
Pavel P. Kulikov ◽  
Anna L. Luss ◽  
Anastasia V. Goryachaya ◽  
...  
Keyword(s):  
Diblock Copolymers ◽  
Chain Transfer ◽  
Main Chain ◽  
Aqueous Media ◽  
Covalent Bond ◽  
Drug Carriers ◽  
The Self ◽  
Self Organization ◽  
Chain Molecules ◽  
Hydrophobic Radical

Poly-N-vinylpyrrolidone-based amphiphilic polymers, which can be used as drug carriers, were prepared by radical polymerization with a thiol-type chain transfer agent. The polymers did not contain sequences of hydrophilic and hydrophobic fragments in the main chain. Molecules contained only one hydrophilic and one hydrophobic fragment linked by a covalent bond. This facilitated the self-organization of macromolecules into micelles in aqueous media. The critical micelle concentration and its dependence on the molecular weight of the diblock copolymers and the length of the hydrophobic radical were determined

A Consequence of Dispersity on the Self‐Assembly of Amphiphilic Homopolymers Containing Main‐Chain Azobenzene

2021 ◽  
pp. 2100202
Author(s):  
An Hu ◽  
Xianheng Shi ◽  
Lishan Li ◽  
Wei Zhang ◽  
Zhengbiao Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Main Chain ◽  
The Self ◽  
Amphiphilic Homopolymers

Problem behavior in autism spectrum disorders: A paradigmatic self-organized perspective of network structures

2019 ◽  
Vol 42 ◽  
Author(s):  
Lucio Tonello ◽  
Luca Giacobbi ◽  
Alberto Pettenon ◽  
Alessandro Scuotto ◽  
Massimo Cocchi ◽  
...  
Keyword(s):  
Autism Spectrum Disorder ◽  
Problem Behaviors ◽  
Autism Spectrum ◽  
The Self ◽  
Network Structures ◽  
Self Organized ◽  
Critical Equilibrium ◽  
Self Organized Criticality ◽  
Acute Agitation ◽  
Spectrum Disorders

AbstractAutism spectrum disorder (ASD) subjects can present temporary behaviors of acute agitation and aggressiveness, named problem behaviors. They have been shown to be consistent with the self-organized criticality (SOC), a model wherein occasionally occurring “catastrophic events” are necessary in order to maintain a self-organized “critical equilibrium.” The SOC can represent the psychopathology network structures and additionally suggests that they can be considered as self-organized systems.

The Nature of Rapidly Extracted Phycocyanin from the Blue-Green Alga Plectonema Boryanum

1971 ◽  
Vol 29 ◽  
pp. 366-367
Author(s):  
M. Kessel ◽  
R. MacColl
Keyword(s):  
Self Assembly ◽  
Analytical Ultracentrifugation ◽  
Uranyl Acetate ◽  
The Self ◽  
Major Protein ◽  
Subunit Structure ◽  
Blue Green Alga ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Cacodylate Buffer

The major protein of the blue-green algae is the biliprotein, C-phycocyanin (Amax = 620 nm), which is presumed to exist in the cell in the form of distinct aggregates called phycobilisomes. The self-assembly of C-phycocyanin from monomer to hexamer has been extensively studied, but the proposed next step in the assembly of a phycobilisome, the formation of 19s subunits, is completely unknown. We have used electron microscopy and analytical ultracentrifugation in combination with a method for rapid and gentle extraction of phycocyanin to study its subunit structure and assembly.To establish the existence of phycobilisomes, cells of P. boryanum in the log phase of growth, growing at a light intensity of 200 foot candles, were fixed in 2% glutaraldehyde in 0.1M cacodylate buffer, pH 7.0, for 3 hours at 4°C. The cells were post-fixed in 1% OsO4 in the same buffer overnight. Material was stained for 1 hour in uranyl acetate (1%), dehydrated and embedded in araldite and examined in thin sections.

Sign in / Sign up

Export Citation Format

Share Document