Liu J.,University of Central Florida |
Liu J.,NuSil Technology LLC |
Moo-Young J.,North Carolina State University |
McInnis M.,University of Central Florida |
And 2 more authors.
Macromolecules | Year: 2014
The assembling behavior of four thiophene-containing conjugated polymers, regioregular poly(3-hexythiophene) (rr-P3HT), poly(3,3-didodecylquaterthiophene) (PQT-12), poly(2,5-bis(3- tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-14), and poly(2,5-bis(3-tetradecylthiophen-2-yl)thiophen-2-yl)thiophen-2- ylthiazolo[5,4-d]thiazole) (PTzQT-14), on carbon nanotubes was investigated through microscopic studies of nanowire formation and theoretical simulation. It is found that polymer backbone rigidity and shape influence the attachment mode on carbon nanotubes. rr-P3HT and PQT-12 have a zigzag backbone structure that allows a thermodynamically stable coaxial attachment on CNTs, providing an ordered growth front for the nanowire formation. In contrast, fused rings in PTzQT-14 and PBTTT-14 create a stair-step like backbone structure that causes a kinetically controlled wrapping conformation on CNTs, generating a twisted growth front that hinders the nanowire formation. In addition, the rigidity of polymer backbone influences the wrapping mode. Polymers with more flexible backbones (i.e., PBTTT-14) would take a dense irregular wrapping mode on CNTs. The CNT diameter plays an important role in the nanowire formation when CPs attach to the CNT in the wrapping mode. Larger nanotubes with smaller surface curvature provides a less twisted polymer growth front, allowing the formation of CPNWs. © 2014 American Chemical Society.
Thomaier R.,NuSil Technology LLC
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011
Messy liquid adhesives, short work times, long cure times, difficult clean-up of stray adhesive- all of these are associated with liquid adhesives for bonding solar cells. Current adhesion methods have been in place since the '70s: mix a two-part liquid silicone adhesive, coat a portion of adhesive onto a section of substrate, place the cells in a vacuum bag and wait for the adhesive to cure. Alternatively, one can use a fairly complicated robotic procedure to apply adhesive then fix a cell down and, again, wait for the adhesive to cure. Some difficulties that need to be overcome include balancing the amount adhesive to spread out with the available worktime in order to get all the cells onto the substrate with good adhesion; controlling the bondline; ensuring that the adhesive cures correctly after application; and, finally, if there is any re-work, removing the part from the adhesive without damaging everything around it. © 2011 SPIE.
Lindberg M.,NuSil Technology LLC
International SAMPE Technical Conference | Year: 2011
Engineers and material scientists are constantly looking for a polymeric adhesive that can perform in a broad operating temperature range, maintain chemical stability and offer unique mechanical properties. The dynamic attributes of silicone adhesives, sealants, coatings and encapsulants provide design engineers with a variety of solutions to the complex challenges they face. The advantages of silicone lie in the chemistry of the polymer chain, which can be modified to achieve desired mechanical properties. The different functional groups (R-substituent groups) bonded to the siloxane backbone can affect properties such as hydrocarbon resistance, optical clarity and elasticity. Another benefit of silicone is the ability to incorporate functional fillers that impart unique properties such as electrical conductivity, thermal conductivity, lower density and increased physical properties. These advanced silicones can also be designed as controlled volatility (CV) materials to handle the rigorous demands of aerospace requirements. Choosing a silicone for your application involves detailed planning and collaboration with a silicone supplier. This article outlines several types of silicones, how they can be modified and customized to suit a specific application, and how to select the appropriate silicone adhesive.
Burkett B.,NuSil Technology LLC
Annual Forum Proceedings - AHS International | Year: 2012
Ice buildup on aircraft surfaces is dangerous and can cause serious problems. The lifting surfaces of helicopters and other vertical lift vehicles are typically under a lot of stress and can, therefore, benefit greatly from coatings that improve the release of ice. In events of ice buildup, silicone's ability to remain elastic at low temperatures has proven extremely valuable. Results from instances of the Zero Degree Cone Test, which measures the force required to push a coated pin out of a frozen ice block, show that silicone promotes very low ice adhesion compared to other materials. Further characterization of silicone's de-icing qualities in an experimental test by NuSil Technology adds support for this material as a high-performing, highly competitive ice phobic coating. This test evaluated specially formulated silicone ice phobic coatings by quantifying the adhesion strength of ice to coated aluminum panels using an ice adhesion fixture and MTS machine. Copyright 2012 by the American Helicopter Society International, Inc. All rights reserved.
Nusil Technology LLC | Date: 2012-11-28
Chemical products based on organosilicon compounds for use in the manufacture of products in the cosmetics industry.