WebAug 12, 2024 · 1. Introduction. Transient devices are an emerging field of research, where polymer films with a limited lifetime are formed through use of degradable materials …
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WebJan 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 … WebTunable Shape Memory Polymers from α-Amino Acid-based Poly(ester urea)s Macromolecules 2024년 ... Peterson, G. I.; Boydston, A. J. Kinetic Analysis of Mechanochemical Chain Scission of Linear Poly(phthalaldehyde). Macromol. Rapid Comm. 2014, 35, 1611-1614.
WebAug 2, 2024 · The polymer network thus formed unzips along the phthalaldehyde backbone to yield monomers and low molecular weight fragments in response to chemical (F −, H +) or physical (light, sonication) stimuli that remove the stabilizing functional endcaps on the phthalaldehyde polymers. 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 15.
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 … WebAbstract. Cationic photopolymerization is a powerful method for UV-curing of epoxy, vinyl ether and oxetane monomers. Little attention has been paid to it over the last few decades compared to the corresponding free radical applications due to unsuitable and inefficient photo-acid generators ( PAG s) used for photoinitiation.
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 easily influenced and manipulated upon either functionalizing the phthalaldehyde monomer with different groups, most … 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 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 … 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 … See more Due to its unique stability, chemical properties, and outstanding tunability and reactivity, PPA has been employed in a variety of applications. Photoresist The high solubility and stability of PPA in organic solvents … See more
WebThese copolymers are then further modified to yield cross-linked, degradable polymer networks in just a two-step sequence. Phthalaldehyde–benzaldehyde copolymers thus … highest gmo foodsWebOct 4, 2013 · DOI: 10.1021/MA401744K Corpus ID: 101441317; Dynamic Covalent Macrocyclic Poly(phthalaldehyde)s: Scrambling Cyclic Homopolymer Mixtures Produces Multi-Block and Random Cyclic Copolymers highest gm stockWebApr 1, 2024 · 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, one-step cationic polymerization ... how get tick off dogWebMasayuki Hata. Laboratory of Physical Chemistry, Faculty of Pharmaceutical Sciences, Chiba University, Chiba 263, Japan. Search for more papers by this author how get teams calls to stop ringing on iphoneWebHector Lopez Hernandez. Department of Mechanical Science and Engineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801 USA how get tickets to saturday night liveWeb2 days ago · O-Phthalaldehyde (CAS 643-79-8), yellow or light yellow crystalline, mainly used in medicine, dyestuff and so on.O-Phthalaldehyde market size is estimated to be worth … how getting married affects your credit scoreWebAug 27, 2024 · A method for measuring the depolymerization time by quartz crystal microbalance has been developed. The copolymer of phthalaldehyde and butanal improves the evaporation time for the polymer by a factor of 11. The onset of thermal decomposition of the copolymer was increased from 107 C for the phthalaldehyde homopolymer to 141 … how get tushita in blox fruits