Photoinduced-absorption investigation of oriented polymer systems: Polyacetylene and copolymer polyacetylene-polynorbornene

1992 ◽  
Vol 45 (16) ◽  
pp. 9439-9442 ◽  
Author(s):  
E. Mulazzi ◽  
A. Ripamonti ◽  
T. Verdon ◽  
S. Lefrant
Keyword(s):  
Photoinduced Absorption ◽  
Oriented Polymer ◽  
Polymer Systems

Molecular Orientation and Absorbance Determination for Oriented Polymers by Tilting Method with Nonpolarized Infrared Light

1971 ◽  
Vol 25 (3) ◽  
pp. 355-360 ◽  
Author(s):  
J. L. Koenig ◽  
M. Itoga
Keyword(s):  
Molecular Orientation ◽  
New Method ◽  
Infrared Light ◽  
Oriented Polymers ◽  
Oriented Polymer ◽  
Polymer Systems ◽  
Unpolarized Light ◽  
Extrapolation Technique ◽  
Experimental Errors

A new method of measuring the absorbance corrected for orientation and the orientation of oriented polymer systems is derived. The method using unpolarized light utilizes a linear plotting and extrapolation technique to minimize experimental errors. The method is applied to oriented nlyon 66 samples and the results are compared with the previous methods.

Molecular engineering of liquid-crystalline polymers: architecture and functionalization

1990 ◽  
Vol 330 (1610) ◽  
pp. 95-108 ◽  
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Amorphous Polymers ◽  
Molecular Engineering ◽  
Molecular Architecture ◽  
Oriented Polymer ◽  
Polymer Backbone ◽  
Polymer Systems ◽  
Crystalline Polymers ◽  
The Past

In the past few years molecular engineering of liquid-crystalline (LC) polymers with respect to molecular architecture and functionalization has become increasingly important. Molecular architecture of LC polymers, i.e. the variation of the arrangement of mesogens, the variation of their shapes (rod, disc, board) and the variation of the polymer backbone, leads to polymers with new LC phases and new properties. Functionalized or dye-containing polymers can be used for a destruction or even the formation of the LC phase by photoreactions as well as for photochromic effects. The induction of discotic phases in amorphous polymers with disc-like mesogens is possible by charge-transfer interactions and opens the accessibility for a wide variety of highly oriented polymer systems.

Polarized Raman spectra of oriented polymer systems: polyacetylene and copolymer polyacetylene-polynorbornene

1991 ◽  
Vol 41 (3) ◽  
pp. 1333-1336 ◽  
Author(s):  
E Mulazzi ◽  
G Leising ◽  
F Stelzer ◽  
T Verdon ◽  
S Lefrant
Keyword(s):  
Raman Spectra ◽  
Oriented Polymer ◽  
Polymer Systems ◽  
Polarized Raman

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

Approaches for TEM imaging of cavitation in toughened nylon

1989 ◽  
Vol 47 ◽  
pp. 352-353
Author(s):  
Barbara A. Wood
Keyword(s):  
Morphological Characteristics ◽  
Structure Property ◽  
Polymer Systems ◽  
Selective Staining ◽  
Structure Property Relationships ◽  
Rubber Toughened ◽  
Shear Yield ◽  
Controversial Topic ◽  
Selection Of ◽  
Diamond Knife

A controversial topic in the study of structure-property relationships of toughened polymer systems is the internal cavitation of toughener particles resulting from damage on impact or tensile deformation.Detailed observations of the influence of morphological characteristics such as particle size distribution on deformation mechanisms such as shear yield and cavitation could provide valuable guidance for selection of processing conditions, but TEM observation of damaged zones presents some experimental difficulties.Previously published TEM images of impact fractured toughened nylon show holes but contrast between matrix and toughener is lacking; other systems investigated have clearly shown cavitated impact modifier particles. In rubber toughened nylon, the physical characteristics of cavitated material differ from undamaged material to the extent that sectioning of heavily damaged regions by cryoultramicrotomy with a diamond knife results in sections of greater than optimum thickness (Figure 1). The detailed morphology is obscured despite selective staining of the rubber phase using the ruthenium trichloride route to ruthenium tetroxide.

Interactions between citrate and montmorillonite-Al hydroxide polymer systems

1997 ◽  
Vol 48 (3) ◽  
pp. 463-472 ◽  
Author(s):  
R.P.T. JANSSEN ◽  
M.G.M. BRUGGENWERT ◽  
W.H. VAN RIEMSDIJK
Keyword(s):  
Polymer Systems
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