Influence of moisture on the photochemically induced polymerisation of epoxy groups in different chemical environment

Hartwig, Andreas; Schneider, Bernhard; Lühring, Andreas

doi:10.1016/s0032-3861(02)00257-4

Cited by 44 publications

(57 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oxirane ring is in this case located in a six-member aliphatic cycle (Figure 2), shifting its absorptions in the mid range towards lower wave numbers, so the main absorption band is located at 790 cm -1 ( Figure 5). This band has been used for quantitative analysis of photochemical reactions (Hartwig et al, 2002;Kim et al, 2003). Apart from the oxirane absorptions this resin shows the bands corresponding to the stretching C-O-C of ethers (1100 cm -1 ) and the C=O stretching (1730 cm -1 ) of esters, which can be useful for identification.…”

Section: Characterizing Epoxy Resins By Irmentioning

confidence: 99%

Infrared Spectroscopy - Materials Science, Engineering and Technology

2012

View full text Add to dashboard Cite

Section: Characterizing Epoxy Resins By Irmentioning

confidence: 99%

Infrared Spectroscopy - Materials Science, Engineering and Technology

2012

View full text Add to dashboard Cite

“…The photoinitiator is a tri-arylsulfonium salt that is cleaved when exposed to UV radiation (hν) to form the cationic initiator. Cationic polymerization has an advantage over free radical polymerization of the epoxides due to their insensitivity against air, mainly oxygen, compared to radical photopolymerization of acrylates [55]. [55].…”

Section: Crosslinkingmentioning

confidence: 99%

“…Cationic polymerization has an advantage over free radical polymerization of the epoxides due to their insensitivity against air, mainly oxygen, compared to radical photopolymerization of acrylates [55]. [55]. H+ represents the cationic species.…”

Section: Crosslinkingmentioning

confidence: 99%

The Fabrication & Characterization of an Electrokinetic Microfluidic Pump from SU-8, a Negative Epoxy-Based Photoresist

Anderson¹

View full text Add to dashboard Cite

Microfluidics refers to manipulation, precise control, and behavior of fluids at the micro and nanoliter scales. It has entered the realm of science as a way to precisely measure or mix small amounts of fluid to perform highly controlled reactions. Glass and polydimethylsiloxane (PDMS) are common materials used to create microfluidic devices; however, glass is difficult to process and PDMS is relatively hydrophobic. In this study, SU-8, an epoxy based (negative) photoresist was used to create various electrokinetic microfluidic chips. SU-8 is commonly used in microelectromechanical design. Spin coating of various SU-8 formulations allows for 1 µm to 100 µm thick layers with aspect ratios reportedly as high as 50:1. Case studies were performed to understand the curing/crosslinking process of SU-8 by differential scanning calorimetry. Supplier (MicroChem) recommended parameters were then altered to allow for adequate development of microfluidic channels, while maintaining enough molecular mobility to subsequently bond the SU-8 to a secondary substrate. Three SU-8 layers were used to create fully (SU-8) enclosed microfluidic channels. An (1) SU-8 2050 fully cured base layer was used as a platform on silicon to build from, (2) an SU-8 2050 partially cured layer for developing microfluidic channels , and (3) an SU-8 2007 uncured layer for bonding a secondary substrate to enclose the microfluidic channels. Bond quality was verified by optical and scanning electron microscopy, which resulted in a nearly 100% bond with little to no reflow of SU-8 into channels. Working pressures (ΔP across the capillary) of 15.57 lb/in 2 (max detection) were obtained with no fluid leaks.

show abstract

“…The photoinitiation in Scheme 1 uses UV light to heterolytically or homolytically cleave the photoinitiation yielding a photoacid. 31,32,33 This photoacid can then initiate and propagate by cationic chain growth, as shown in Scheme 2 and 3 respectively. Finally, termination can be reached through combination with a counter-ion, beta-proton transfer, or, most likely, chain transfer from the development with isopropyl alcohol.…”

mentioning

confidence: 99%

“…Finally, termination can be reached through combination with a counter-ion, beta-proton transfer, or, most likely, chain transfer from the development with isopropyl alcohol. 31 Fabrication of microPADs historically use a very similar fabrication method. Unlike other photolithographic methods, photolithographic fabrication of microPADs does not build three-dimensional structures onto a substrate.…”

mentioning

confidence: 99%

Stabilization of Horseradish Peroxidase Using Epoxy Novolac Resins for Applications with Microfluidic Paper-Based Analytical Devices

Chaplan¹

View full text Add to dashboard Cite

Microfluidic paper-based analytical devices (microPADs) are an emerging platform for point-of-care diagnostic tests for use by untrained users with potential applications in healthcare, environmental monitoring, and food safety. These devices can be developed for a multitude of different tests, many of which employ enzymes as catalysts. Without specialized treatment, some enzymes tend to lose their activity when stored on microPADs within 48 hours, which is a major hurdle for taking these types of devices out of the laboratory and into the real world. This work focused on the development of simple methods for stabilizing enzymes by applying polymers to chromatography paper. The longterm stabilization was exlored and SU-8 of various concentrations was found to stabilize horseradish peroxidase for times in excess of two weeks. A variety of microPAD fabrications, enzyme dispensing methods, and substrate delivery techniques were explored.

show abstract

Influence of moisture on the photochemically induced polymerisation of epoxy groups in different chemical environment

Cited by 44 publications

References 11 publications

Infrared Spectroscopy - Materials Science, Engineering and Technology

Infrared Spectroscopy - Materials Science, Engineering and Technology

The Fabrication & Characterization of an Electrokinetic Microfluidic Pump from SU-8, a Negative Epoxy-Based Photoresist

Stabilization of Horseradish Peroxidase Using Epoxy Novolac Resins for Applications with Microfluidic Paper-Based Analytical Devices

Contact Info

Product

Resources

About