Structural evolution of crystalline polymer latex films: Propagating and confined acoustic modes

2003 ◽  
Vol 82 (10) ◽  
pp. 1532-1534 ◽  
Author(s):  
Matteo Pierno ◽  
Carlo S. Casari ◽  
Roberto Piazza ◽  
Carlo E. Bottani
Keyword(s):  
Structural Evolution ◽  
Crystalline Polymer ◽  
Latex Films ◽  
Acoustic Modes ◽  
Polymer Latex

Structural evolution and acoustic phonon behavior in crystalline PTFE latex films

2003 ◽  
Vol 779 ◽  
Author(s):  
M. Pierno ◽  
C.S. Casari ◽  
A. Li Bassi ◽  
M.G. Beghi ◽  
R. Piazza ◽  
...  
Keyword(s):  
Structural Evolution ◽  
Crystalline Polymer ◽  
Model Systems ◽  
Fibrillar Structure ◽  
Sintering Process ◽  
Latex Films ◽  
Force Microscopy ◽  
Crystalline Polymers ◽  
Atomic Force ◽  
Acoustic Excitations

AbstractThe structural evolution of polytetrafluoroethylene (PTFE) crystalline polymer latex films is studied at hundreds nanometer length scale by atomic force microscopy and Brillouin light scattering. In a controlled sintering process the transition is observed from the original particle distribution towards a ‘fibrillar’ structure of crystalline regions embedded in a disordered matrix. This transition is accompanied by a cross-over from localized acoustic excitations to propagating acoustic phonons, related to mesoscopic elastic properties. After sintering, a ‘mark’ of the original particulate structure persists, suggesting that filming of crystalline polymers may be analogous to sintering of ceramic powders. Films of crystalline polymers can thus be exploited as model systems to study the elasto-optical properties of granular and disordered media.

Structural Evolution and Acoustic Phonon Behavior in Crystalline PTFE Latex Films

2003 ◽  
Vol 778 ◽  
Author(s):  
M. Pierno ◽  
C.S. Casari ◽  
A. Li Bassi ◽  
M.G. Beghi ◽  
R. Piazza ◽  
...  
Keyword(s):  
Structural Evolution ◽  
Crystalline Polymer ◽  
Model Systems ◽  
Fibrillar Structure ◽  
Sintering Process ◽  
Latex Films ◽  
Force Microscopy ◽  
Crystalline Polymers ◽  
Atomic Force ◽  
Acoustic Excitations

AbstractThe structural evolution of polytetrafluoroethylene (PTFE) crystalline polymer latex films is studied at hundreds nanometer length scale by atomic force microscopy and Brillouin light scattering. In a controlled sintering process the transition is observed from the original particle distribution towards a ‘fibrillar’ structure of crystalline regions embedded in a disordered matrix. This transition is accompanied by a cross-over from localized acoustic excitations to propagating acoustic phonons, related to mesoscopic elastic properties. After sintering, a ‘mark’ of the original particulate structure persists, suggesting that filming of crystalline polymers may be analogous to sintering of ceramic powders. Films of crystalline polymers can thus be exploited as model systems to study the elasto-optical properties of granular and disordered media.

Studies on Porosity in Polymer Latex Films

2001 ◽  
pp. 233-245 ◽  
Author(s):  
Ian C. Hodges ◽  
John Hearn ◽  
Michael C. Wilkinson
Keyword(s):  
Latex Films ◽  
Polymer Latex

Studies on polymer latex films: III. Permeability of latex films to aqueous organic solutes

1992 ◽  
Vol 27 (1) ◽  
pp. 51-55 ◽  
Author(s):  
B. J. Roulstone ◽  
M. C. Wilkinson ◽  
J. Hearn
Keyword(s):  
Organic Solutes ◽  
Latex Films ◽  
Polymer Latex

Studies on permeation through polymer latex films, III. Modification using soluble polymeric additives

1995 ◽  
Vol 38 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Paul A. Steward ◽  
John Hearn ◽  
Michael C. Wilkinson
Keyword(s):  
Latex Films ◽  
Polymeric Additives ◽  
Polymer Latex

scholarly journals Study of Phase Transition by FTIR/SAXS/WAXD Simultaneous Measurement System

2014 ◽  
Vol 70 (a1) ◽  
pp. C1070-C1070
Author(s):  
Kohji Tashiro ◽  
Hiroko Yamamoto ◽  
Taiyo Yoshioka ◽  
Daisuke Tahara
Keyword(s):  
Phase Transition ◽  
Measurement System ◽  
Simultaneous Measurement ◽  
Isothermal Crystallization ◽  
Structural Phase ◽  
Structural Evolution ◽  
Crystalline Polymer ◽  
Soft Materials ◽  
Order Structure ◽  
Crystalline Polymers

FTIR/SAXS/WAXD simultaneous measurement system has been developed for the study of the structural phase transition behaviors of soft materials including crystalline polymers. The system consists of a transmission-type miniature FTIR spectrometer set around the sample stage and the 2-dimensional detectors for WAXD and SAXS measurements in a synchronized mode, as shown in Figure. The infrared and X-ray beams can pass through the same position of a sample, which is set on the various types of equipments such as a stretcher, a heater, a temperature-jump cell for isothermal crystallization, etc. The system has been successfully applied to the studies of the structural evolution processes of crystalline polymers. For example, an intimate relationship has been clarified between the structural change in the crystal lattice and the change in lamellar stacking mode during the stress-induced phase transition of poly(tetramethylene terephthalate). Another example is the study of phase transition of aliphatic nylons in the heating and cooling processes. So far the aliphatic nylons were considered to show the phase transition at a so-called Brill transition point, but the simultaneous measurement revealed another phase transition occurring in a temperature region immediately below the melting point. The structural evolution has been also studied for the isothermal crystallization process of crystalline polymer from the melt, as seen in the case studies of polyethylene, nylon, polyester, and so on. The concrete description was made for the regularization process viewed from the various hierarchical levels of molecular chain conformation, chain packing mode, and lamellar stacking mode or higher-order structure.

Studies on polymer latex films: IV. Comparison of the permeability of latex and solvent-cast films

1992 ◽  
Vol 27 (4) ◽  
pp. 305-308 ◽  
Author(s):  
B. J. Roulstone ◽  
M. C. Wilkinson ◽  
J. Hearn
Keyword(s):  
Latex Films ◽  
Cast Films ◽  
Solvent Cast ◽  
Polymer Latex

Scanning Electric Potential Microscopy Imaging of Polymer Latex Films:  Detection of Supramolecular Domains with Nonuniform Electrical Characteristics

2001 ◽  
Vol 105 (15) ◽  
pp. 3005-3011 ◽  
Author(s):  
Melissa Braga ◽  
Carlos Alberto Rodrigues Costa ◽  
Carlos Alberto Paula Leite ◽  
Fernando Galembeck
Keyword(s):  
Electric Potential ◽  
Electrical Characteristics ◽  
Latex Films ◽  
Microscopy Imaging ◽  
Polymer Latex

Atomic force microscopy investigations on polymer latex films

1995 ◽  
Vol 23 (6) ◽  
pp. 416-425 ◽  
Author(s):  
B. Anczykowski ◽  
L. F. Chi ◽  
H. Fuchs
Keyword(s):  
Atomic Force Microscopy ◽  
Latex Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Polymer Latex
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