Compression Molding and Nickel Molds for Directional Gecko-Inspired Adhesives

2021 ◽  
Author(s):  
Capella F Kerst ◽  
Mark R. Cutkosky
Keyword(s):  
Ambient Temperature ◽  
Compression Molding ◽  
Hot Compression ◽  
Molding Process ◽  
Surface Features ◽  
Cycle Times ◽  
The Common ◽  
Temperature And Pressure ◽  
Microscopic Surface ◽  
Adhesive Performance

Abstract In the fabrication of directional gecko-inspired adhesives, a new capability made possible by the availability of metal molds is hot compression molding. This molding process allows the use of elastomers with much higher toughness than those cast at ambient temperature and pressure, as has been the common case in fabricating adhesives. In addition, it permits fast cycle times (minutes instead of hours), which is useful for volume manufacturing. We present the results of hot compression molding of elastomers in metal molds created with overhanging and tapered microscopic surface features, which give rise to anisotropic adhesion. We show that the adhesive performance so obtained is equivalent to that obtained earlier with PDMS.

scholarly journals Space charges formed in the hot compression molding process of low density polyethylene

2007 ◽  
Vol 56 (9) ◽  
pp. 5502
Author(s):  
An Zhen-Lian ◽  
Yang Qiang ◽  
Zheng Fei-Hu ◽  
Zhang Ye-Wen
Keyword(s):  
Compression Molding ◽  
Hot Compression ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Molding Process ◽  
Space Charges

Curing of Glass Fiber/Epoxy Resin Composites Using Multiwalled Carbon Nanotubes Buckypaper as a Resistive Element

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
J. A. Rojas ◽  
B. Ribeiro ◽  
M. C. Rezende
Keyword(s):  
Glass Fiber ◽  
Epoxy Resin ◽  
Compression Molding ◽  
Hot Compression ◽  
Resin Composites ◽  
Curing Process ◽  
Molding Process ◽  
Multiwalled Carbon ◽  
Resistive Element ◽  
Epoxy Resin Composites

Abstract Glass fiber/epoxy resin composites (GF/EP) were prepared using one and three multiwalled carbon nanotube buckypapers (BPs) as a resistive element. Compared to the conventional hot compression molding process that demanded 4200 W to fabricate the GF/EP laminate, the proposed curing process consumed only 63 W, representing a saving power of 98.5%. The thermal distribution of the BP and their composites were recorded using an infrared thermometer. Differential scanning calorimetry (DSC) curves have not shown a residual cure, suggesting the curing process using the BP as a resistive element was effective. The cross section views of the laminates were analyzed by scanning electron microscopy (SEM), and the mechanical characterizations were performed by impulse excitation technique (IET), compression shear test (CST), and interlaminar shear strength (ILSS). The results demonstrated that the BP composites showed a good consolidation between the prepregs layers, and presented no significant variations in the mechanical tests compared to the traditional hot compression molding process. Nevertheless, dynamic mechanical analyses (DMA) showed a slight decrease in the BP composites’ storage moduli compared to GF/EP laminate.

scholarly journals Influence of Ambient Temperature on Radiative and Convective Heat Dissipation Ratio in Polymer Heat Sinks

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2286
Author(s):  
Jan Kominek ◽  
Martin Zachar ◽  
Michal Guzej ◽  
Erik Bartuli ◽  
Petr Kotrbacek
Keyword(s):  
Heat Transfer ◽  
Ambient Temperature ◽  
Convective Heat ◽  
Heat Dissipation ◽  
High Surface ◽  
Heat Sinks ◽  
Fourth Power ◽  
Molding Process ◽  
Ambient Temperatures ◽  
University Of Technology

Miniaturization of electronic devices leads to new heat dissipation challenges and traditional cooling methods need to be replaced by new better ones. Polymer heat sinks may, thanks to their unique properties, replace standardly used heat sink materials in certain applications, especially in applications with high ambient temperature. Polymers natively dispose of high surface emissivity in comparison with glossy metals. This high emissivity allows a larger amount of heat to be dissipated to the ambient with the fourth power of its absolute surface temperature. This paper shows the change in radiative and convective heat transfer from polymer heat sinks used in different ambient temperatures. Furthermore, the observed polymer heat sinks have differently oriented graphite filler caused by their molding process differences, therefore their thermal conductivity anisotropies and overall cooling efficiencies also differ. Furthermore, it is also shown that a high radiative heat transfer leads to minimizing these cooling efficiency differences between these polymer heat sinks of the same geometry. The measurements were conducted at HEATLAB, Brno University of Technology.

scholarly journals Bulk Liquid Water at Ambient Temperature and Pressure from MP2 Theory

2013 ◽  
Vol 4 (21) ◽  
pp. 3753-3759 ◽  
Author(s):  
Mauro Del Ben ◽  
Mandes Schönherr ◽  
Jürg Hutter ◽  
Joost VandeVondele
Keyword(s):  
Ambient Temperature ◽  
Liquid Water ◽  
Bulk Liquid ◽  
Temperature And Pressure

scholarly journals Reactor Design for CO2 Photo-Hydrogenation toward Solar Fuels under Ambient Temperature and Pressure

Catalysts ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 63 ◽  
Author(s):  
Chun-Ying Chen ◽  
Joseph Yu ◽  
Van-Huy Nguyen ◽  
Jeffrey Wu ◽  
Wei-Hon Wang ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Reactor Design ◽  
Solar Fuels ◽  
Temperature And Pressure

scholarly journals Innovation in Aircraft Cabin Interior Panels Part I: Technical Assessment on Replacing the Honeycomb with Structural Foams and Evaluation of Optimal Curing of Prepreg Fiberglass

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3207 ◽  
Author(s):  
Edgar Adrián Franco-Urquiza ◽  
Annika Dollinger ◽  
Mauricio Torres-Arellano ◽  
Saúl Piedra ◽  
Perla Itzel Alcántara Llanas ◽  
...  
Keyword(s):  
Weight Ratio ◽  
Viscoelastic Behavior ◽  
Compression Molding ◽  
Polyurethane Foams ◽  
Future Research ◽  
Honeycomb Core ◽  
Molding Process ◽  
Aircraft Cabin ◽  
Structural Applications ◽  
Cabin Interior

Sandwich composites are widely used in the manufacture of aircraft cabin interior panels for commercial aircraft, mainly due to the light weight of the composites and their high strength-to-weight ratio. Panels are used for floors, ceilings, kitchen walls, cabinets, seats, and cabin dividers. The honeycomb core of the panels is a very light structure that provides high rigidity, which is considerably increased with fiberglass face sheets. The panels are manufactured using the compression molding process, where the honeycomb core is crushed up to the desired thickness. The crushed core breaks fiberglass face sheets and causes other damage, so the panel must be reworked. Some damage is associated with excessive build-up of resin in localized areas, incomplete curing of the pre-impregnated fiberglass during the manufacturing process, and excessive temperature or residence time during the compression molding. This work evaluates the feasibility of using rigid polyurethane foams as a substitute for the honeycomb core. The thermal and viscoelastic behavior of the cured prepreg fiberglass under different manufacturing conditions is studied. The first part of this work presents the influence of the manufacturing parameters and the feasibility of using rigid foams in manufacturing flat panels oriented to non-structural applications. The conclusion of the article describes the focus of future research.

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