SELF-TRAPPING OF OPTICAL VORTEX BY USING THE MOLECULAR REORIENTATION IN PHOTOSENSITIVE POLYMERIC MATERIALS

2012 ◽  
Vol 21 (01) ◽  
pp. 1250012 ◽  
Author(s):  
RAN TAO ◽  
JIANG-ZHUAN ZHU ◽  
DONG SHEN ◽  
XIAO-YAN GU ◽  
DUAN-BIN LUO
Keyword(s):  
Methyl Methacrylate ◽  
Azo Dye ◽  
Green Light ◽  
Polymeric Materials ◽  
Optical Vortex ◽  
Input Power ◽  
Molecular Reorientation ◽  
Poly Methyl Methacrylate ◽  
Self Trapping ◽  
Linearly Polarized

Amorphous bulk composites were prepared by doping azo-dye Disperse Red 13 (DR13) in poly(methyl methacrylate) (PMMA) matrices. Photo-induced anisotropy of such kind of bulk polymer material was investigated experimentally by measuring the birefringence when irradiating it with linearly polarized green light. We report the first observation of self-trapping of an optical vortex based on such effect in bulk poly(methyl methacrylate) materials containing photosensitive azo-dye molecules. The dependence of the average core width of a single-charge optical vortex versus time and input power was investigated in detail.

Design of Porous Polymeric Materials from Interpenetrating Polymer Networks (IPNs):  Poly(dl-lactide)/Poly(methyl methacrylate)-Based Semi-IPN Systems

2005 ◽  
Vol 38 (17) ◽  
pp. 7274-7285 ◽  
Author(s):  
Géraldine Rohman ◽  
Daniel Grande ◽  
Françoise Lauprêtre ◽  
Sylvie Boileau ◽  
Philippe Guérin
Keyword(s):  
Methyl Methacrylate ◽  
Polymer Networks ◽  
Polymeric Materials ◽  
Interpenetrating Polymer Networks ◽  
Poly Methyl Methacrylate

Fluorescence characterization of ablated polymeric materials: Poly(methyl methacrylate) doped with 1‐ethylpyrene

1990 ◽  
Vol 67 (5) ◽  
pp. 2240-2244 ◽  
Author(s):  
Akira Itaya ◽  
Akihiko Kurahashi ◽  
Hiroshi Masuhara ◽  
Yoshio Taniguchi ◽  
Masashi Kiguchi
Keyword(s):  
Methyl Methacrylate ◽  
Polymeric Materials ◽  
Poly Methyl Methacrylate

Holographic characterization of azo-dye doped poly (methyl methacrylate) films

1995 ◽  
Vol 270 (1-2) ◽  
pp. 295-299 ◽  
Author(s):  
Vinh Phuc Pham ◽  
Gurusamy Manivannan ◽  
Roger A. Lessard
Keyword(s):  
Methyl Methacrylate ◽  
Azo Dye ◽  
Poly Methyl Methacrylate

scholarly journals The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4822
Author(s):  
Szabolcs Pásztor ◽  
Bálint Becsei ◽  
Györgyi Szarka ◽  
Yi Thomann ◽  
Ralf Thomann ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Single Case ◽  
Average Molecular Weight ◽  
Polymeric Materials ◽  
Poly Methyl Methacrylate ◽  
Margin Of Error ◽  
20 Nm

The glass transition temperature (Tg) is one of the most important properties of polymeric materials. In order to reveal whether the scissors effect, i.e., the Fox–Flory relationship between Tg and the average molecular weight between crosslinking points (Mc), reported only in one case for polymer conetworks so far, is more generally effective or valid only for a single case, a series of poly(methyl methacrylate)-l-polyisobutylene (PMMA-l-PIB) conetworks was prepared and investigated. Two Tgs were found for the conetworks by DSC. Fox–Flory type dependence between Tg and Mc of the PMMA component (Tg = Tg,∞ − K/Mc) was observed. The K constants for the PMMA homopolymer and for the PMMA in the conetworks were the same in the margin of error. AFM images indicated disordered bicontinuous, mutually nanoconfined morphology with average domain sizes of 5–20 nm, but the correlation between Tg and domain sizes was not found. These new results indicate that the macrocrosslinkers act like molecular scissors (scissors effect), and the Tg of PMMA depend exclusively on the Mc in the conetworks. Consequently, these findings mean that the scissors effect is presumably a general phenomenon in nanophase-separated polymer conetworks, and this finding could be utilized in designing, processing, and applications of these novel materials.

A General Nonlithographic Method for Producing Nanodots by RIE Etching

2007 ◽  
Vol 1059 ◽  
Author(s):  
Jacob H. Leach ◽  
Hadis Morkoç
Keyword(s):  
Methyl Methacrylate ◽  
Low Cost ◽  
Polymeric Materials ◽  
Thin Layers ◽  
Wet Etching ◽  
General Technique ◽  
Poly Methyl Methacrylate

ABSTRACTIn this work, thin layers of poly(methyl methacrylate) (PMMA) on Ni on silicon <111> substrates were etched almost completely away by oxygen RIE, leaving only the topmost portion of the roughness, generating nanodots of PMMA approximately 30-40nm or smaller in size. After sufficiently hard baking the samples to promote PMMA adhesion to the Ni and to increase the robustness of the PMMA, the nanodots were used as a mask to etch the thin Ni films, thus generating Ni nanodots on Si. The Ni nanodots were then used as a reactive ion (RIE) etch mask, thereby generating Si nanopillars. With further understanding of the mechanism of the generation of the roughness of the PMMA, or with the use of other polymeric materials suitable as wet etching masks, nanodots of varying size should be attainable. This method represents a very simple, low cost, scalable, and general technique to produce nanodots of various thin metals on various substrates.

Machining of Poly Methyl Methacrylate (PMMA) and Other Olymeric Materials

2022 ◽  
pp. 363-379
Author(s):  
Fredrick M. Mwema ◽  
Job Maveke Wambua
Keyword(s):  
Methyl Methacrylate ◽  
Removal Rate ◽  
High Hardness ◽  
Polymeric Materials ◽  
High Strength ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
High Fracture ◽  
Poly Methyl Methacrylate ◽  
Optical Applications

Polymers have been adopted industrially in the manufacture of lenses for optical applications due to their attractive properties such as high hardness, high strength, high ductility, high fracture toughness, and also their low thermal and electrical conductivities. However, they have limited machinability and are therefore classified as hard-to-machine materials. This study conducts a critical review on the machining of various polymers and polymeric materials, with particular focus on poly (methyl methacrylate) (PMMA). From the review it was concluded that various machining parameters affect the output qualities of polymers and which include the spindle speed, the feed rate, vibrations, the depth of cut, and the machining environment. These parameters tend to affect the surface roughness, the cutting forces, delamination, cutting temperatures, tool wear, precision, vibrations, material removal rate, and the mechanical properties such as hardness, among others. A multi-objective optimization of these machining parameters is therefore required, especially in the machining of PMMA.

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