Monodisperse and Telechelic Polyethylenes Form Extended Chain Crystals with Ionic Layers

2019 ◽  
Vol 52 (13) ◽  
pp. 4949-4956 ◽  
Author(s):  
Lu Yan ◽  
Manuel Häußler ◽  
Julia Bauer ◽  
Stefan Mecking ◽  
Karen I. Winey
Keyword(s):  
Extended Chain

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

scholarly journals Identification of the age-period-cohort model and the extended chain-ladder model

Biometrika ◽  
2008 ◽  
Vol 95 (4) ◽  
pp. 979-986 ◽  
Author(s):  
D. Kuang ◽  
B. Nielsen ◽  
J. P. Nielsen
Keyword(s):  
Cohort Model ◽  
Ladder Model ◽  
Extended Chain ◽  
Chain Ladder

scholarly journals Forecasting with the age-period-cohort model and the extended chain-ladder model

Biometrika ◽  
2008 ◽  
Vol 95 (4) ◽  
pp. 987-991 ◽  
Author(s):  
D. Kuang ◽  
B. Nielsen ◽  
J. P. Nielsen
Keyword(s):  
Cohort Model ◽  
Ladder Model ◽  
Extended Chain ◽  
Chain Ladder

Magnetic concentration and polymorphism in di-n-octyl-, di-n-decyl-, and di-n-dodecylphosphinates of copper(II)

1985 ◽  
Vol 63 (5) ◽  
pp. 1111-1117 ◽  
Author(s):  
John S. Haynes ◽  
Katherine W. Oliver ◽  
Robert C. Thompson
Keyword(s):  
Differential Scanning Calorimetry ◽  
Magnetic Susceptibility ◽  
Heisenberg Model ◽  
Variable Temperature ◽  
Electronic Spectroscopy ◽  
Chain Structure ◽  
Magnetic Data ◽  
Scanning Calorimetry ◽  
Extended Chain ◽  
Linear Chains

Phosphinates of copper(II) of the type Cu(R2PO2)2 where R is n-octyl, n-decyl, and n-dodecyl have been synthesized and characterized by differential scanning calorimetry, vibrational and electronic spectroscopy, and variable temperature (300 to 4.2 K) magnetic susceptibility studies. Each of these compounds was obtained in distinct α and β structural forms. All materials appear to have the double phosphinate bridged extended chain structure and the magnetic data have been successfully analyzed according to the isotropic Heisenberg model for linear chains. The α forms exhibit antiferromagnetic behaviour with J values of −25, −29, and −29 cm−1 for the octyl, decyl, and dodecyl derivatives respectively. The β forms are ferromagnetic and have corresponding J values of 1.8, 2.1, and 2.3 cm−1 respectively. Magneto-structural correlations in these extended chain coordination polymers are discussed.

Lamellar Thickening Growth of an Isolated Extended Chain Single Crystal of PE

1993 ◽  
pp. 331-336 ◽  
Author(s):  
M. Hikosaka ◽  
K. Amano ◽  
S. Rastogi ◽  
A. Keller
Keyword(s):  
Single Crystal ◽  
Extended Chain
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