Polyphthalaldehyde
WebAug 7, 2013 · Polyphthalaldehyde is a metastable polymer that can rapidly and quantitatively depolymerize due to its low ceiling temperature. However, the effect of … 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 …
Polyphthalaldehyde
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WebApr 8, 2013 · Polyphthalaldehyde-block-polystyrene as a nanochannel template. Journal of Materials Chemistry B 2014 , 2 (23) , 3578. DOI: 10.1039/c4tb00491d. 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 …
WebA degradable polyphthalaldehyde-polystyrene block copolymer generated by modular ligation is reported for the first time serving as a nanochannel template for the formation … Webo-Phthalaldehyde is, to this day, the only aromatic aldehyde that can be homopolymerized through chain-growth polymerization.The product, polyphthalaldehyde (PPA), is a brittle …
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. WebSep 18, 2024 · Polyphthalaldehyde is a metastable polymer that can rapidly and quantitatively depolymerize due to its low ceiling temperature. However, the effect of …
WebNov 18, 2024 · Thin diffractive optics with high efficiency for the extreme ultraviolet (EUV) and soft x-ray (SXR) photon range could be fabricated by combining TSPL with a single etching step if the TSPL resist, polyphthalaldehyde (PPA), can be used as an etch mask to direct-etch the pattern into a substrate using reactive ion etching.
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] css style the last child in an elementWebHector Lopez Hernandez, Olivia P. Lee, Catherine Possanza, Joshua A. Kaitz, Chan Woo Park, Christopher L. Plantz, Jeffrey S. Moore, Scott R. White early 2000s celebritiesWebPolyphthalaldehyde Linear; Synonyms: PPA; Linear Formula: (C8H6O2)n; find Sigma-Aldrich-900029 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich early 2000s cbbc showsWebThe 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 … early 2000s britney spearsWebNov 6, 2024 · Polyphthalaldehyde (PPA) is a representative degradable polymer that can be end-to-end depolymerized. Herein polymers bearing two and three PPA chains have been … early 2000s cartoon with a little girlWebEnd-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, ... early 2000s cell phone brandsWebThis 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 … css style to make a button grid