WebAug 11, 2014 · An interesting feature of the mechanochemical breakdown of PPA is that “half-chain” daughter fragments are not observed, since the depolymerization is rapid following chain scission. These features facilitate the determination of rate constants of activation for multiple molecular weights from a single sonication experiment. WebTriggered Transience of Metastable Poly(phthalaldehyde) for Transient Electronics Hector Lopez Hernandez , Seung-Kyun Kang , Olivia P. Lee ... transient electronics fabricated on a cyclic PPA (cPPA) substrate with a photo-acid generator (PAG) additive. The electronics are destroyed by triggering the PAG/cPPA substrates with UV
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WebPoly , abbreviated as PPA, is a metastable stimuli-responsive polymer first synthesized in 1967.[1] It has garnered significant attention during the past couple of years due to its ease of synthesis and outstanding transient and mechanical properties.[2] for this reason, It has been exploited for a variety of applications including sensing, drug delivery, and EUV … WebApr 28, 2014 · Here, we show that polymer-to-monomer unzipping of a low-T c poly(o-phthalaldehyde) (PPA) 14,15 can be triggered by force-induced chain scission 5,16,17,18.
WebNov 6, 2024 · o-Phthalaldehyde is, to this day, the only aromatic aldehyde that can be homopolymerized through chain-growth polymerization. The product, polyphthalaldehyde … WebAug 2, 2024 · Rheology is used to demonstrate gelation within 5 s of light exposure of the allylated-phthalaldehyde polymers reacted with pentaerythritol tetrakis(3-mercaptopropionate) and photoinitiator (3 wt%). Triggerable degelation makes this material well suited for photolithography and additive manufacturing as well as other applications …
WebApr 8, 2013 · DOI: 10.1021/MA4001594 Corpus ID: 100945584; Reproducible and Scalable Synthesis of End-Cap-Functionalized Depolymerizable Poly(phthalaldehydes) @article{Dilauro2013ReproducibleAS, title={Reproducible and Scalable Synthesis of End-Cap-Functionalized Depolymerizable Poly(phthalaldehydes)}, author={Anthony Michael … Webbeing above the polymer’s ceiling temperature, yet kinetically stabilized from depolymerization by end-capping, these polymers represent a unique class of materials capable of rapid and complete head-to-tail depolymerization upon removal of the end-cap.6 Poly(phthalaldehyde) (PPA) is one such low T c polymer
WebPolyphthalaldehyde. (C8H6O2)n. Synonyms: . CAS null. Molecular Weight null. Browse Polyphthalaldehyde and related products at MilliporeSigma.
Poly(phthalaldehyde), abbreviated as PPA, is a metastable stimuli-responsive polymer first synthesized in 1967. It has garnered significant attention during the past couple of years due to its ease of synthesis and outstanding transient and mechanical properties. for this reason, It has been exploited for a … See more Poly(phthalaldehyde) was first reported in 1967 by Chuji Aso and Sanae Tagami from the department of Organic Synthesis at Kyushu University by an addition homopolymerization reaction of aromatic o-phthalaldehyde (Figure … See more PPA is a metastable polymer known for its ease of synthesis and rapid depolymerization. In addition, its properties can be … See more Due to its unique stability, chemical properties, and outstanding tunability and reactivity, PPA has been employed in a variety of applications. See more Since its first inception in 1967, many synthesis techniques have been developed and employed for the polymerization of o-phthalaldehyde. Most notably, living polymerization methods are among the most common and promising techniques used, as can be … See more Depending on the polymerization technique applied, two different types of poly(phthalaldehyde) can be acquired, linear and cyclic (see Figure 1). In this section, the properties and characteristics of each type will be thoroughly depicted. Linear PPA See more According to the safety data sheet of PPA, it should not be allowed in contact with the skin or eyes as it may lead to skin, eye, and respiratory irritations or allergic reactions. In addition, as some … See more some books are to beWebFeb 9, 2009 · Graz University of Technology, Institute of Chemistry and Technology of Organic Materials, Stremayrgasse 16/I, 8010 Graz, Austria. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria small business lending dailyWebPoly(phthalaldehyde) [PPA] (0.20 g) is weighed into a Schlenk flask and dissolved in dichloromethane (2 mL). The solution is cooled to -78 °C and boron trifluoride etherate is … some borders not showing excelWebPoly , abbreviated as PPA, is a metastable stimuli-responsive polymer first synthesized in 1967.[1] It has garnered significant attention during the past couple of years due to its … small business lending defWebMar 15, 2009 · Request PDF Amphiphilic Block Copolymers Containing Thermally Degradable Poly(phthalaldehyde) Blocks In this study, the preparation of a new class of amphiphilic block copolymers consisting of ... small business lending definitionWebJan 15, 1997 · It is demonstrated that a cationic polymerization of o-phthalaldehyde initiated by boron trifluoride results in cyclic PPA in high yield, with high molecular weight, and with … some bouncers use themWebAug 28, 2013 · The cyclic polymers are reversibly opened and closed under the polymerization conditions. Owing to PPA's low ceiling temperature, cyclic PPA is capable … small business lending bank of america