Poly phthalaldehyde ppa
WebPPA is limited, however, in the type of macromolecular architectures accessible, as functionalizable phthalaldehyde derivatives are not commercially available and their synthesis is cumbersome. To this end, a general route to phthalaldehyde–benzaldehyde copolymers was sought, as benzaldehyde comonomers with various pendant … Webbeing above the polymer’s ceiling temperature, yet kinetically stabilized from depolymerization by end-capping, these polymers represent a unique class of materials …
Poly phthalaldehyde ppa
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WebJan 16, 2024 · Cyclic Poly (phthalaldehyde): Thermoforming a Bulk Transient Material. ACS Macro Lett. 2024 Jan 16;7 (1):47-52. doi: 10.1021/acsmacrolett.7b00769. Epub 2024 Dec … 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.
WebMar 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 ... WebAddition of a plasticizer to the stabilized cPPA enabled the fabrication of a monolithic solid polymer via hot press molding. Importantly, it is shown that the thermally processed cPPA retains its stimuli responsive depolymerization capability and will enable future work in the fabrication of bulk plastic parts that depolymerize and disintegrate on demand.
WebThe 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 … 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 …
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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 inconsistency\u0027s grWebThere is an urgent need to recycle glass fiber-reinforced polymer (GFRP) and carbon fiber-reinforced polymer (CFRP) composites due to environmental challenges caused by incineration and traditional landfilling. This review incorporates an overview of the latest knowledge on the recycling techniques for different GFRP and CFRP composites. inconsistency\u0027s h1WebPPA is limited, however, in the type of macromolecular architectures accessible, as functionalizable phthalaldehyde derivatives are not commercially available and their … inconsistency\u0027s hhWebPoly(phthalaldehyde) (PPA) was first reported in 19671 and was subsequently explored as a candidate photoresist for photolithography 16 years later.2 In this context, the polymer 20 … inconsistency\u0027s hlWebAug 2, 2024 · Rheology is used to demonstrate gelation within 5 s of light exposure of the allylated-phthalaldehyde polymers reacted with pentaerythritol tetrakis(3 … inconsistency\u0027s h5Poly(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 inconsistency\u0027s hkWebAug 7, 2013 · A promising transient polymer is cyclic poly-(phthalaldehyde) (cPPA), which has a room temperature storage modulus of 1.5−2 GPa 12 and is prepared in a scalable, … inconsistency\u0027s h8