A review of thermoplastic polymer foams for functional applications

Abstract ISOPLAST 101, unreinforced, is a rigid, amorphous polyurethane thermoplastic polymer. It is opaque and impact modified. It is injection moldable and extrudable. It is characterized by its high impact strength, high abrasion resistance, excellent chemical and solvent resistance and low moisture sensitivity. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness. It also includes information on wear resistance. Filing Code: P-10. Producer or source: The Dow Chemical Company.

Download Full-text

Influence of the Porosity of Polymer Foams on the Performances of Capacitive Flexible Pressure Sensors

Sensors ◽

10.3390/s19091968 ◽

2019 ◽

Vol 19 (9) ◽

pp. 1968 ◽

Cited By ~ 11

Author(s):

Sylvie Bilent ◽

Thi Hong Nhung Dinh ◽

Emile Martincic ◽

Pierre-Yves Joubert

Keyword(s):

Experimental Data ◽

Linear Model ◽

Dielectric Material ◽

Pressure Sensors ◽

Volume Ratio ◽

Measurement Range ◽

Polymer Foams ◽

First Order ◽

Non Linear ◽

Flexible Pressure Sensors

This paper reports on the study of microporous polydimethylsiloxane (PDMS) foams as a highly deformable dielectric material used in the composition of flexible capacitive pressure sensors dedicated to wearable use. A fabrication process allowing the porosity of the foams to be adjusted was proposed and the fabricated foams were characterized. Then, elementary capacitive pressure sensors (15 × 15 mm2 square shaped electrodes) were elaborated with fabricated foams (5 mm or 10 mm thick) and were electromechanically characterized. Since the sensor responses under load are strongly non-linear, a behavioral non-linear model (first order exponential) was proposed, adjusted to the experimental data, and used to objectively estimate the sensor performances in terms of sensitivity and measurement range. The main conclusions of this study are that the porosity of the PDMS foams can be adjusted through the sugar:PDMS volume ratio and the size of sugar crystals used to fabricate the foams. Additionally, the porosity of the foams significantly modified the sensor performances. Indeed, compared to bulk PDMS sensors of the same size, the sensitivity of porous PDMS sensors could be multiplied by a factor up to 100 (the sensitivity is 0.14 %.kPa−1 for a bulk PDMS sensor and up to 13.7 %.kPa−1 for a porous PDMS sensor of the same dimensions), while the measurement range was reduced from a factor of 2 to 3 (from 594 kPa for a bulk PDMS sensor down to between 255 and 177 kPa for a PDMS foam sensor of the same dimensions, according to the porosity). This study opens the way to the design and fabrication of wearable flexible pressure sensors with adjustable performances through the control of the porosity of the fabricated PDMS foams.

Download Full-text

2.45 GHz Patch Antenna Based on Thermoplastic Polymer Substrates

2018 IEEE International RF and Microwave Conference (RFM) ◽

10.1109/rfm.2018.8846493 ◽

2018 ◽

Cited By ~ 1

Author(s):

Nurul Hanani Manab ◽

Elfarizanis Baharudin ◽

Fauziahanim Che Seman ◽

Alyani Ismail

Keyword(s):

Patch Antenna ◽

Thermoplastic Polymer ◽

Polymer Substrates

Download Full-text

Some Bounds for the Complex Čebyšev Functional of Functions of Bounded Variation

Symmetry ◽

10.3390/sym13060990 ◽

2021 ◽

Vol 13 (6) ◽

pp. 990

Author(s):

Silvestru Sever Dragomir

Keyword(s):

Bounded Variation ◽

Functions Of Bounded Variation ◽

Functional Applications ◽

Čebyšev Functional

In this paper, we provide several bounds for the modulus of the complex Čebyšev functional. Applications to the trapezoid and mid-point inequalities, that are symmetric inequalities, are also provided.

Download Full-text