scholarly journals Dynamic relaxations in a bio-based polyamide with enhanced mechanical modulus

2018 ◽  
Vol 135 (47) ◽  
pp. 46846 ◽  
Author(s):  
G. Haddou ◽  
A. Roggero ◽  
J. Dandurand ◽  
E. Dantras ◽  
P. Ponteins ◽  
...  
Keyword(s):  
Mechanical Modulus

scholarly journals Enhancing sensitivity of QCM for dengue type 1 virus detection using graphene-based polymer composites

2021 ◽  
Author(s):  
Krongkaew Navakul ◽  
Chak Sangma ◽  
Pa-thai Yenchitsomanus ◽  
Suticha Chunta ◽  
Peter A. Lieberzeit
Keyword(s):  
Zeta Potential ◽  
Polymer Composites ◽  
Virus Detection ◽  
Hemorrhagic Fever ◽  
Imprinted Polymer ◽  
Significant Interference ◽  
Significant Attention ◽  
Positively Charged ◽  
Mechanical Modulus

AbstractGraphene oxide-molecularly imprinted polymer composites (GO-MIP) have attracted significant attention as recognition materials in sensing due to their outstanding properties in terms of electrical and thermal conductivity, high mechanical modulus, and the comparably straightforward way to functionalize them. The aim of this study was to design a MIP-based sensor recognition material and enhance its sensitivity by blending it with GO for sensing a harmful dengue hemorrhagic fever pathogen, namely the dengue type 1 virus (DENV-1). Polymer composites comprising GO incorporated to an acrylamide (AAM)/methacrylic acid (MAA)/methyl methacrylate (MMA)/N-vinylpyrrolidone (VP) copolymer were synthesized and compared to the “pure” MIP, i.e., the copolymer without GO. The pure polymer revealed a zeta potential of + 9.9 ± 0.5 mV, whereas GO sheets prepared have a zeta potential of − 60.3 ± 2.7 mV. This results in an overall zeta potential of − 11.2 ± 0.2 mV of the composite. Such polymer composites seem appropriate to bind the positively charged DENV-1 particle (+ 42.2 ± 2.8 mV). GO-MIP coated onto 10-MHz quartz crystal microbalance (QCM) sensors indeed revealed two times sensitivity compared to sensors based on the pure MIP. Furthermore, GO-polymer composites revealed imprinting factors of up to 21, compared to 3 of the pure MIP. When plotting the sensor characteristic in a semilogarithmic way, the composite sensor shows the linear response to DENV-1 in the concentration range from 100 to 103 pfu mL−1. The corresponding limits of detection (S/N = 3) and quantification (S/N = 10) are 0.58 and 1.94 pfu mL−1, respectively. Furthermore, imprinted polymer composites selectively bind DENV-1 without significant interference: DENV-2, DENV-3, DENV-4, respectively, yield 13–16% of DENV-1 signal. The sensor requires only about 15–20 min to obtain a result. Graphical abstract

Structure and Properties of Polysilsesquioxanes and Copolymers for Ultra-Low Dielectric Films

2003 ◽  
Vol 766 ◽  
Author(s):  
Do Y. Yoon ◽  
Hyun Wook Ro ◽  
Eun Su Park ◽  
Jin-Kyu Lee ◽  
Hie-Joon Kim ◽  
...  
Keyword(s):  
Copper Interconnects ◽  
Dielectric Constants ◽  
Dielectric Films ◽  
Structure And Properties ◽  
Structure Property ◽  
Detailed Structure ◽  
Low Dielectric ◽  
Structure Property Relationships ◽  
Mechanical Modulus ◽  
Made In

AbstractPolysilsesquioxanes (PSSQs) with the empirical formula (RSiO3/2)n have become very important as low-dielectric insulators for copper interconnects in the next-generation logic devices, but the detailed structure-property relationships were completely lacking. We have investigated the microstructure and functional properties of PSSQs with varying alkyl substituents and also PSSQ copolymers. As a result, significant advances have been made in the scientific understanding of PSSQ structures and significant improvements of key properties such as the crack resistance, mechanical modulus and hardness, and incorporation of nanometer-sized (<4 nm) porosity for ultra-low dielectric constants (<2.0).

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

Fracture behavior of heat treated liquid crystalline polymers

2012 ◽  
Vol 1485 ◽  
pp. 137-142 ◽  
Author(s):  
A. Reyes-Mayer ◽  
B Alvarado-Tenorio ◽  
A Romo-Uribe ◽  
O Flores ◽  
B Campillo ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Treatment ◽  
Thermal Behavior ◽  
Fracture Behavior ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Thermally Induced ◽  
Crystalline Polymers ◽  
Heat Treated ◽  
Mechanical Modulus

ABSTRACTThermotropic polymers are thermally treated in air at temperatures Ta, where ΔT =Ta- Ts→n=40°C, and Ts→n is the solid-to-nematic transition. Samples are extruded thin films of a series of thermotropic random copolyesters termed B-N, COTBP and RD1000. The thermal treatment produces a second endotherm without changing Ts→n for B-N and RD1000. However, for COTBP Ts→n is significantly increased. Regardless of the complex thermal behavior exhibited by the thermotropes, the thermal treatment produces a significant increase in Young's modulus, more than 30% for B-N and over 100% for COTBP. The increase in mechanical modulus is correlated with a thermally-induced fiber-like morphology.

Elastic Property Measurement of High-Tension Bolt Based on Mode Converted Ultrasound

2006 ◽  
Vol 326-328 ◽  
pp. 709-712
Author(s):  
Noh Yu Kim ◽  
Sang Soon Lee
Keyword(s):  
Mode Conversion ◽  
Longitudinal Mode ◽  
Shear Mode ◽  
Ultrasonic Technique ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
High Tension ◽  
Longitudinal And Shear Waves ◽  
Property Measurement ◽  
Mechanical Modulus

Elastic properties of high tension bolt are evaluated non-destructively by measuring acoustic longitudinal and shear wave velocities using mode-converted ultrasound. Mode-converted longitudinal and shear waves along bolt are captured to calculate acoustic wave velocities and determine elastic constants such as Young’s modulus and Bulk modulus based on acoustoelasticity. Ray analysis to select a specific mode conversion from longitudinal mode to shear mode is carried out and discussed with experimental results. From experiment results of maximum 5% of measurement error, it is shown that the proposed mode-converted ultrasonic technique is very effective and sensitive enough to characterize mechanical modulus of high-tension bolts quantitatively.

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