Poly(olefin sulfone)s

Sasaki, Takeo; Le, Khoa V.; Naka, Yumiko

doi:10.5772/intechopen.69317

Cited by 3 publications

(6 citation statements)

References 27 publications

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“…Our preliminary result from 2+1 flavor dynamical lattice QCD has been reported in Ref. [44] and further study is now in progress [45]. Although it is most likely that the CKM unitarity could be satisfied in the Σ → N beta decay within the current experimental accuracy, the confirmation of the non-zero value of g 2 (0) directly calculated from the first-principles is primary required for the first-row CKM-unitarity test through independent determinations of V us from the hyperon beta decays.…”

Section: Chiral and Continuum Extrapolation Of F1(0)supporting

confidence: 55%

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Continuum limit of hyperon vector coupling f1(0) from 2+1 flavor domain wall QCD

Sasaki

2017

Phys. Rev. D

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We determine the hyperon vector couplings f1(0) for Σ − → nl −ν l and Ξ 0 → Σ + l −ν l semileptonic decays in the continuum limit with (2+1)-flavors of dynamical domain-wall fermions, using the Iwasaki gauge action at two different lattice spacings of a = 0.114(2) and 0.086(2) fm. A theoretical estimation of flavor SU (3)-breaking effect on the vector coupling is required to extract Vus from the experimental rate of hyperon beta decays. We obtain the vector couplings f1(0) for Σ → N and Ξ → Σ beta-decays with an accuracy of less than one percent. We then find that lattice results of f1(0) combined with the best estimate of |Vus| with imposing Cabibbo-Kobayashi-Maskawa (CKM) unitarity are slightly deviated from the experimental result of |Vusf1(0)| for the Σ → N betadecay. This discrepancy can be attributed to an assumption made in the experimental analysis on |Vusf1(0)|, where the induced second-class form factor g2 is set to be zero regardless of broken SU (3) symmetry. We report on this matter and then estimate the possible value of g2(0), which is evaluated from the experimental decay rate with our lattice result of f1(0) under the first-row CKM-unitarity condition. SU(3) 1hereafter) in the exact SU (3) symmetry limit (m ud = m s ) [3]. However, in the real world, the SU (3) symmetry is largely broken. Thus, a theoretical estimate of SU (3) breaking-effects on the vector coupling f 1 (0) is primarily required for the precise determination of |V us | from the experimental rate of hyperon beta decays.Here, the hyperon vector coupling f 1 (0) can be

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Section: Chiral and Continuum Extrapolation Of F1(0)supporting

confidence: 55%

“…[44], a non-zero g 2 form factor is likely evident in fully dynamical lattice QCD and its size is roughly consistent with the indirect estimation presented here. Further study is now in progress [45].…”

Section: Discussionmentioning

confidence: 93%

Continuum limit of hyperon vector coupling f1(0) from 2+1 flavor domain wall QCD

Sasaki

2017

Phys. Rev. D

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“…Instead, the depolymerization has been initiated by random backbone cleavage at the relatively weak C−S bond, followed by entropically favored release of gaseous SO 2 and the corresponding vinyl monomer. The depolymerization can follow a free-radical (Scheme 9b) 104 or E2 elimination (Scheme 9c) 105 mechanism depending on the stimulus, conditions, and specific POS structure. In principle, the depolymerization products can be collected and repolymerized, although this has not yet been explicitly demonstrated.…”

Section: ■ Reversible Sipsmentioning

confidence: 99%

Triggering Depolymerization: Progress and Opportunities for Self-Immolative Polymers

Yardley

Kenaree

Gillies³

2019

Macromolecules

119

133

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Polymers that depolymerize end-to-end upon cleavage of their backbones or end-caps, often termed “self-immolative” polymers (SIPs), have garnered significant interest in recent years. They can be distinguished from other degradable and stimuli-responsive polymers by their ability to provide amplified responses to stimuli, as a single bond cleavage event is translated into the release of many small molecules through a cascade of reactions. Here, the synthesis and properties of the major classes of SIPs including poly(benzyl carbamate)s, poly(benzyl carbonate)s, poly(benzyl ether)s polyphthalaldehydes, polyglyoxylates, polyglyoxylamides, and poly(olefin sulfone)s are presented. In addition, their advantages and limitations as well as their recent applications in areas including sensors, drug delivery, micro- and nanopatterning, transient devices and composites, coatings, antibacterial, and recyclable plastics are described. Finally, the challenges associated with the development of new SIP backbones and their translation into commercial products are discussed.

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“…Since 2007, Sasaki and co‐workers have dedicated to develop a PBG strategy for the complete breakdown of the poly(olefin sulfone) chains (Figure A) . The main chain of the alternating poly(olefin sulfone) is a repeating sequence of ethane moieties and sulfone.…”

Section: Uv‐light‐induced Depolymerisationmentioning

confidence: 99%

“…As a consequence, the chemical bonds between carbon and hydrogen in −CH 2 − units are weakened, leading to the ready abstraction of protons on the carbon by a surrounding base. This H‐abstraction reaction leads to a chain reaction of depolymerisation of poly(olefin sulfone)s through an unzipping mechanism and therefore regenerates the original monomers, olefin and SO 2 (Figure B) . The physical mixed or chemically incorporated PBG was able to generate a base under UV irradiation which subsequently served as a catalyst to trigger the breakdown of polymer chains.…”

Section: Uv‐light‐induced Depolymerisationmentioning

confidence: 99%

Photo‐Induced Depolymerisation: Recent Advances and Future Challenges

et al. 2019

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Facing the growing environmental issues provoked by the use of nondegradable polymers in many fields (for example, packing, building, and clothing), tremendous efforts have been made to explore photodegradable materials to alleviate the increase in plastic pollution. Photodegradable materials would exploit significant advantages presented by the use of light, such as abundance, safety and the ability to easily tune intensity and wavelength. In particular, photo‐induced depolymerisation has received increasing attention, which could enable polymers to degrade to their original monomers or small molecules under certain photoirradiation conditions. Most importantly, the obtained molecules or monomers via photo‐induced depolymerisation could be conveniently recycled or further transformed to other high‐value‐added products, which is of great benefit for environmental protection. This Review summarizes recent advances in the growing field of photo‐induced depolymerisation and also considers future challenges that must be addressed. It aims to encourage new researchers to enter this flourishing area and presents a brief guide to the field.

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Poly(olefin sulfone)s

Cited by 3 publications

References 27 publications

Continuum limit of hyperon vector coupling f1(0) from 2+1 flavor domain wall QCD

Continuum limit of hyperon vector coupling f1(0) from 2+1 flavor domain wall QCD

Triggering Depolymerization: Progress and Opportunities for Self-Immolative Polymers

Photo‐Induced Depolymerisation: Recent Advances and Future Challenges

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