Polyphthalaldehyde
WebThis work deals with the synthesis and characterization of new diblock copolymers based on π-conjugated and depolymerizable units. These diblock copolymers are based on a regioregular poly(3-hexylthiophene) sequence associated with a sacrificial block, namely polyphthalaldehyde. The conjugated polymer was obtained by Grignard metathesis … WebJul 1, 2024 · Abstract. Background: Polyphthalaldehyde (PPA)-based systems can be interesting candidates for extreme ultraviolet (EUV) lithography as dry development resists with simple chemistry. Aim: We present EUV-induced mechanistic and contrast curve studies for the end-capped PPA. Approach: Fourier transform infrared (FTIR) …
Polyphthalaldehyde
Did you know?
WebFeb 21, 2024 · use is polyphthalaldehyde (PPA) with a glass transition tem-perature of ≈150 °C. Above this temperature, the PPA polymer chains break and simultaneously unzip into small volatile molecules.[23] Consequently, PPA does not melt, but directly sublimates and thus enables the localized depolymerization at sub-10 nm scale and at high speed.[24] WebJul 14, 2024 · Background: Polyphthalaldehyde (PPA)-based systems can be interesting candidates for extreme ultraviolet (EUV) lithography as dry development resists with …
WebFeb 4, 2024 · Hernandez HL, Lee OP, Casey CMP, et al. Accelerated thermal depolymerization of cyclic polyphthalaldehyde with a polymeric thermoacid generator. Macromol Rapid Commun. 2024;39(1800046):1-5. WebNov 6, 2024 · The product, polyphthalaldehyde (PPA), is a brittle white solid, and, having a polyacetal main chain, presents the ability to depolymerize quite rapidly in the presence of an acid. This review highlights the unique polymerization chemistry of o-phthalaldehyde since its discovery over half a century ago, describing the different methods for the ...
WebThe use of a dry treatment to remove the polyphthalaldehyde block strongly reduces the morphological damages that would occur with a “wet” processing route. These nanoporous poly(3-hexylthiophene) films could be useful for controlling the morphology of the heterojunction in organic photovoltaic devices after successful filling with an electron …
WebOct 2, 2007 · Fréchet quickly advanced a particular polymer as a possible candidate for use in such a system: polyphthalaldehyde (PPHA). This polymer chain is unstable at room temperature; its propensity is to unzip, to depolymerize. The only way to stabilize the polymer at temperatures up to 200°C is to cap the chain with a chemical group.
WebEnd-capped polyphthalaldehyde is a stable, low ceiling temperature polymer whose films can be directly exposed with UV, X-ray or e-beam radiation to give spontaneously developed images. 42 The photolysis of an acid-generating species such as iodonium or sulfonium salts in polyphthalaldehyde film results in a very facile degradation, ... iron man black sabbath textWebNov 1, 2024 · Polyphthalaldehyde (PPA) microcapsules from which immediate release could be UV-triggered were formulated. Using a UV-responsive system enabled a remote … port of wine birthmarkWebPolyphthalaldehyde is a metastable polymer that is rapidly and quantitatively depolymerized due to its low ceiling temperature. However, the effect of substitution on the physical and … iron man black panther suitWebApr 30, 2024 · Abstract Thermally triggerable polymer films that degrade at modest temperatures (≈85 °C) are created from a blend of cyclic polyphthalaldehyde (cPPA) and … port of winer extractionsWebSep 18, 2024 · Polyphthalaldehyde is a metastable polymer that can rapidly and quantitatively depolymerize due to its low ceiling temperature. However, the effect of … iron man bethany cabeWebThis work deals with the synthesis and characterization of new diblock copolymers based on π-conjugated and depolymerizable units. These diblock copolymers are based on a … port of winer hugeWebSynthesis of Polyphthalaldehyde-Based Block Copolymers: Utilization of a Thermo-Sacrificial Segment for an Easy Access to Fine-Tuned Poly(3-hexylthiophene) Nanostructured Films. Macromolecules 2016, 49 (8) , 3001-3008. DOI: 10.1021/acs.macromol.6b00283. port of winer removal