scholarly journals Aryl‐group substituted polysiloxanes with high‐optical transmission, thermal stability, and refractive index

2021 ◽  
Author(s):  
Dennis Meier ◽  
Volker Huch ◽  
Guido Kickelbick
Keyword(s):  
Thermal Stability ◽  
Refractive Index ◽  
Optical Transmission ◽  
Aryl Group ◽  
High Optical Transmission

Optically Transparent Polymethyl Methacrylate Composites made with Glass Fibers of Varying Refractive Index

1997 ◽  
Vol 12 (4) ◽  
pp. 1091-1101 ◽  
Author(s):  
Seunggu Kang ◽  
Hongy Lin ◽  
Delbert E. Day ◽  
James O. Stoffer
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Refractive Index ◽  
Mechanical Strength ◽  
Glass Fiber ◽  
Polymethyl Methacrylate ◽  
Optical Transmission ◽  
Annealing Temperature ◽  
Glass Fibers ◽  
Optically Transparent

The dependence of the optical and mechanical properties of optically transparent polymethyl methacrylate (PMMA) composites on the annealing temperature of BK10 glass fibers was investigated. Annealing was used to modify the refractive index (R.I.) of the glass fiber so that it would more closely match that of PMMA. Annealing increased the refractive index of the fibers and narrowed the distribution of refractive index of the fibers, but lowered their mechanical strength so the mechanical properties of composites reinforced with annealed fibers were not as good as for composites containing as-pulled (chilled) glass fibers. The refractive index of as-pulled 17.1 μm diameter fibers (R.I. = 1.4907) increased to 1.4918 and 1.4948 after annealing at 350 °C to 500 °C for 1 h or 0.5 h, respectively. The refractive index of glass fibers annealed at 400 °C/1 h best matched that of PMMA at 589.3 nm and 25 °C, so the composite reinforced with those fibers had the highest optical transmission. Because annealed glass fibers had a more uniform refractive index than unannealed fibers, the composites made with annealed fibers had a higher optical transmission. The mechanical strength of annealed fiber/PMMA composites decreased as the fiber annealing temperature increased. A composite containing fibers annealed at 450 °C/1 h had a tensile strength 26% lower than that of a composite made with as-pulled fibers, but 73% higher than that for unreinforced PMMA. This decrease was avoided by treating annealed fibers with HF. Composites made with annealed and HF (10 vol. %)-treated (for 30 s) glass fibers had a tensile strength (∼200 MPa) equivalent to that of the composites made with as-pulled fibers. However, as the treatment time in HF increased, the tensile strength of the composites decreased because of a significant reduction in diameter of the glass fiber which reduced the volume percent fiber in the composite.

Controlling Thermoplastic Elastomer Optical Properties by Mechanical Processing

MRS Advances ◽  
2019 ◽  
Vol 4 (23) ◽  
pp. 1341-1347 ◽  
Author(s):  
Margaret Campbell ◽  
Paramjot Singh ◽  
Kunal Kate ◽  
Cindy K. Harnett
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Transmission ◽  
Thermoplastic Elastomer ◽  
Mechanical Processing ◽  
Sensor Signal ◽  
Extrusion Speed ◽  
The Core ◽  
Lower Refractive Index ◽  
Urethane Elastomer

ABSTRACTWe demonstrate that the extrusion speed of thermoplastic urethane elastomer can modify its optical transmission by a factor of more than 100. Varying extrusion speed at constant temperature may tune optical properties along the axis of a filament, for example creating absorbent regions that are sensitive to length and diameter changes, surrounded by more transmissive segments that carry the sensor signal over long distances. Such waveguiding in a stretchable optical fiber requires a stretchable cladding with lower refractive index than the core. In experiments toward a rugged, stretchable fiber cladding, we investigated whether solvents could modify the outer structure of the filaments. Soaking the filaments in NMP (n-methyl-2-pyrrolidone), then stretching the filaments while the solvent dried, turned out to modify the filaments in a way that solvents alone did not, creating porosity and reducing the appearance of optical clarity.

Study on Measuring System of Automatic Image Alignment Refractive Index Based on New Mathematical Model

2014 ◽  
Vol 609-610 ◽  
pp. 1319-1323
Author(s):  
Qing Hua Yao ◽  
Miao Cao ◽  
Chang Liu
Keyword(s):  
Refractive Index ◽  
Optical Transmission ◽  
Optical Glass ◽  
Measuring System ◽  
Practical Significance ◽  
High Demand ◽  
Accuracy Measurement ◽  
General Instrument ◽  
Measurement Repeatability ◽  
High Accuracy Measurement

With the development of measuring technology,the measuring accuracy of optical glass refractive index of the increasingly high demand,V prism refractometers is major general instrument for measuring the refractive index of optical glass,not only the simple device,convenient measurement,and this method has high precision performance,however,the accuracy is only attained ,which in the regulation of national metrology verification and the introduction of V prism refractometers in the literature,the classic formula calculation principle formula error caused by refractive index has more than .Based on the mechanical structure and optical transmission to improve the original V prism refractometers the refractive index of air,by considering the influence on measurement precision of V prism refractometer,to mathematical modeling of V prism refractometer the principle formula,V can be measured refractive prism refractometer rate accuracy increased to ,measurement repeatability less than ,has important practical significance for realizing high accuracy measurement of the refractive index of optical glass.

Optical properties, thermal stability, and forming region of high refractive index La2 O3 -TiO2 -Nb2 O5 glasses

2017 ◽  
Vol 101 (4) ◽  
pp. 1500-1507 ◽  
Author(s):  
Zhaozhao Mao ◽  
Chaoyue Wang ◽  
Xiaojie Zheng ◽  
Jianding Yu ◽  
Liangming Xiong
Keyword(s):  
Thermal Stability ◽  
Refractive Index ◽  
Optical Properties ◽  
High Refractive Index

The Structure and Optical Properties of Dy3+ Doped PLZT Ceramics

2005 ◽  
Vol 475-479 ◽  
pp. 1189-1192
Author(s):  
Yong Zhang ◽  
Ai Li Ding ◽  
Qing Rui Yin
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Transmission ◽  
Single Phase ◽  
Tetragonal Structure ◽  
Structural And Optical Properties ◽  
Method Effects

The polycrystalline Dy3+ doped PLZT ceramics with compositional formula [Pb0.88 (La1-xDyx)0.12](Zr0.40Ti0.60)O3, were prepared by hot-pressed method. Effects of Dy3+ substitution on structural and optical properties were report here. All the samples have single phase with tetragonal structure, and the tetragonality was increased with content increased. As Dy3+ content increased, the optical transmission was found to decrease, and the refractive index was raised slightly.

Fluorinated, Low Thermal Expansion Coefficient Polyimides For Interlayer Dielectric Application: Thermal Stability, Refractive Index And High Temperature Modulus Measurements

1995 ◽  
Vol 381 ◽  
Author(s):  
Brian C. Auman
Keyword(s):  
Thermal Stability ◽  
Refractive Index ◽  
Glass Transition ◽  
Moisture Absorption ◽  
Mechanical Analysis ◽  
Interlayer Dielectric ◽  
Low Thermal Expansion ◽  
Fluorinated Polyimides ◽  
Out Of Plane ◽  
Mechanical Modulus

AbstractThe mechanical, thermal, electrical and moisture absorption properties of rod-like, fluorinated polyimides and copolyimides developed in our laboratory are briefly reviewed. Further characterization work on the most promising candidates for interlayer dielectric applications is reported. This includes in- and out-of-plane refractive index measurements to estimate the isotropy of the dielectric constant, isothermal TGA measurements to assess thermal stability at processing temperatures and dynamic-mechanical analysis to ascertain the glass transition temperature and the mechanical modulus at temperatures in excess of the glass transition

Highly flexible and optical transparent 6F-PI/TiO2optical hybrid films with tunable refractive index and excellent thermal stability

2010 ◽  
Vol 20 (3) ◽  
pp. 531-536 ◽  
Author(s):  
Guey-Sheng Liou ◽  
Po-Han Lin ◽  
Hung-Ju Yen ◽  
Yang-Yen Yu ◽  
Tsung-Wei Tsai ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Refractive Index ◽  
Hybrid Films ◽  
Excellent Thermal Stability ◽  
Tunable Refractive Index

Polyphenylsilsesquioxane Partially-substituted with Germanium: Refractive Index Controllability and Thermal Stability

2002 ◽  
Vol 31 (2) ◽  
pp. 244-245 ◽  
Author(s):  
Naoki Yasuda ◽  
Shigeyuki Yamamoto ◽  
Yasuchika Hasegawa ◽  
Hideharu Nobutoki ◽  
Yuji Wada ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Refractive Index
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