Well-Defined Star-Shaped Aromatic Polyamides from Chain-Growth Polymerization of Phenyl 4-(Alkylamino)benzoate with Multifunctional Initiators

2005 ◽  
Vol 38 (13) ◽  
pp. 5526-5531 ◽  
Author(s):  
Ryuji Sugi ◽  
Yoshio Hitaka ◽  
Akihiro Yokoyama ◽  
Tsutomu Yokozawa
Keyword(s):  
Chain Growth ◽  
Aromatic Polyamides

Inductive Effect-Assisted Chain-Growth Polycondensation. Synthetic Development frompara-tometa-Substituted Aromatic Polyamides with Low Polydispersities

2005 ◽  
Vol 127 (29) ◽  
pp. 10172-10173 ◽  
Author(s):  
Ryuji Sugi ◽  
Akihiro Yokoyama ◽  
Taniyuki Furuyama ◽  
Masanobu Uchiyama ◽  
Tsutomu Yokozawa
Keyword(s):  
Inductive Effect ◽  
Chain Growth ◽  
Aromatic Polyamides

Self-initiated Chain-growth Polycondensation for Aromatic Polyamides

2004 ◽  
Vol 33 (3) ◽  
pp. 272-273 ◽  
Author(s):  
Tsutomu Yokozawa ◽  
Ryuji Sugi ◽  
Toshinobu Asai ◽  
Akihiro Yokoyama
Keyword(s):  
Chain Growth ◽  
Aromatic Polyamides

Convenient Method of Chain-Growth Polycondensation for Well-Defined Aromatic Polyamides

2005 ◽  
Vol 26 (12) ◽  
pp. 979-981 ◽  
Author(s):  
Tsutomu Yokozawa ◽  
Daichi Muroya ◽  
Ryuji Sugi ◽  
Akihiro Yokoyama
Keyword(s):  
Convenient Method ◽  
Chain Growth ◽  
Aromatic Polyamides

Electron Microscopic Observation of the Longitudinal Organization of Poly (p-Phenylene Terephthalamide) Fibers

1982 ◽  
Vol 40 ◽  
pp. 680-681
Author(s):  
Li Li-Sheng ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Microscopic Observation ◽  
Electron Microscopic Observation ◽  
Electron Microscopic ◽  
Aromatic Polyamides ◽  
Radial Arrangement ◽  
Scanning Electron ◽  
Better Than

The aromatic polyamides form a class of fibers having mechanical properties which are much better than those of aliphatic polyamides. Currently, the accepted morphology of these fibers as proposed by M.G. Dobb, et al. is a radial arrangement of pleated sheets, with the plane of the pleats parallel to the axis of the fiber. We have recently obtained evidence which supports a different morphology of this type of fiber, using ultramicrotomy and ion-thinning techniques to prepare specimens for transmission and scanning electron microscopy.

Carbon Chain Growth by Sequential Reactions of CO and CO2 with a Transition Metal Carbonyl Complex

2018 ◽  
Author(s):  
Richard Kong ◽  
Mark Crimmin
Keyword(s):  
Transition Metal ◽  
Metal Carbonyl ◽  
Carbon Chain ◽  
Chain Growth ◽  
Carbonyl Complex ◽  
Fischer Tropsch ◽  
Carbon Chains ◽  
Sequential Coupling ◽  
Energy Economy ◽  
Sequential Reactions

<i>The formation of carbon chains by the coupling of COx (X = 1 or 2) units on transition metals is a fundamental step relevant to Fischer-Tropsch catalysis. Fischer-Tropsch catalysis produces energy dense liquid hydrocarbons from synthesis gas (CO and H2) and has been a mainstay of the energy economy since its discovery nearly a century ago. Despite detailed studies aimed at elucidating the steps of catalysis, experimental evidence for chain growth (Cn to Cn+1 ; n > 2) from the reaction of CO with metal complexes is unprecedented. In this paper, we show that carbon chains can be grown from sequential reactions of CO or CO2 with a transition metal carbonyl complex. By exploiting the cooperative effect of transition and main group metals, we document the first example of chain propagation from sequential coupling of CO units (C1 to C3 to C4), along with the first example of incorporation of CO2 into the growing carbon chain.</i><br>

Polymer Chemistry

2004 ◽  
Keyword(s):  
Conducting Polymers ◽  
Liquid Crystalline ◽  
Polymer Chemistry ◽  
Chain Growth ◽  
Crystalline Polymers ◽  
Wide Range ◽  
Cyclic Oligomers ◽  
Step Growth

Polymer Chemistry: A Practical Approach in Chemistry has been designed for both chemists working in and new to the area of polymer synthesis. It contains detailed instructions for preparation of a wide-range of polymers by a wide variety of different techniques, and describes how this synthetic methodology can be applied to the development of new materials. It includes details of well-established techniques, e.g. chain-growth or step-growth processes together with more up-to-date examples using methods such as atom-transfer radical polymerization. Less well-known procedures are also included, e.g. electrochemical synthesis of conducting polymers and the preparation of liquid crystalline elastomers with highly ordered structures. Other topics covered include general polymerization methodology, controlled/"living" polymerization methods, the formation of cyclic oligomers during step-growth polymerization, the synthesis of conducting polymers based on heterocyclic compounds, dendrimers, the preparation of imprinted polymers and liquid crystalline polymers. The main bulk of the text is preceded by an introductory chapter detailing some of the techniques available to the scientist for the characterization of polymers, both in terms of their chemical composition and in terms of their properties as materials. The book is intended not only for the specialist in polymer chemistry, but also for the organic chemist with little experience who requires a practical introduction to the field.

Sign in / Sign up

Export Citation Format

Share Document