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Aggregate 2023年第6期4卷 85-94页

作者： Valentina A.Dini Damiano Genovese Cosimo Micheletti Nelsi Zaccheroni Andrea Pucci Chiara Gualandi department of chemistry“giacomo ciamician” University of BolognaBolognaItaly instm udr of bologna University of BolognaBolognaItaly department of chemistry and Industrial chemistry University of PisaPisaItaly instm udr of Pisa University of PisaPisaItaly Health Sciences and Technologies(HST)CIRI University of BolognaOzano Emilia BolognaItaly Advanced Applications in Mechanical Engineering and Materials Technology CIRI University of BolognaBolognaItaly

Aggregation-induced emission(AIE)luminogens are attractive dyes to probe poly-mer properties that depend on changes in chain mobility and free *** embedded in polymers the restriction of intramolecular motion(RIM)can lead to their photoluminescence quantum yield(PLQY)strong enhancement if local microviscosity increases(lowering of chain mobility and free volume).Nonethe-less,measuring PLQY during stimuli,*** or mechanical stress,is technically challenging;thus,emission intensity is commonly used instead,assuming its direct correlation with the ***,by usingﬂuorescence lifetime as an absoluteﬂuorescence parameter,it is demonstrated that this assumption can be invalid in many commonly encountered *** this aim,different poly-mers are loaded with tetraphenylenethylene(TPE)and characterized during the application of thermal and mechanical stress and physical *** these con-ditions,polymer matrix transparency variation is observed,possibly due to local changes in refractive index and to the formation of *** combin-ing different characterization techniques,it is proved that scattering can affect the apparent emission intensity,while lifetime measurements can be used to ascertain whether the observed phenomenon is due to modiﬁcations of the photophysi-cal properties of AIE dyes(RIM effect)or to alterations in the matrix optical properties.

关键词： AIE luminogens glass transition mechanochromism physical aging scattering smart polymer

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Nanocomposite electrospun fibers of poly(ε-caprolactone)/bioactive glass with shape memory properties

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Bioactive Materials 2022年第5期7卷 230-239页

作者： Liliana Liverani Anna Liguori Paola Zezza Chiara Gualandi Maurizio Toselli Aldo R.Boccaccini Maria Letizia Focarete department of Materials Science and Engineering University of Erlangen-NurembergCauerstr.691058ErlangenGermany department of chemistry“giacomo ciamician”and instm udr of bologna University of Bolognavia Selmi 240126BolognaItaly Interdepartmental Center for Industrial Research on Advanced Applications in Mechanical Engineering and Materials Technology CIRI-MAMUniversity of BolognaViale Risorgimento240136BolognaItaly department of Industrial chemistry“Toso Montanari” University of BolognaViale Risorgimento 440136BolognaItaly Health Sciences and Technologies–Interdepartmental Center for Industrial Research(HST-ICIR) Alma Mater Studiorum-Universit`a di Bologna40064Ozzano dell’EmiliaBolognaItaly

Electrospun fibers of shape memory triethoxysilane-terminated poly(epsilon-caprolactone)(PCL-TES)loaded with bioactive glasses(BG)are here *** PCL-TES,as well as PCL/BG nanocomposite fibers,are also considered for *** is proposed that hydrolysis and condensation reactions take place between triethoxysilane groups of the polymer and the silanol groups at the BG particle surface,thus generating additional crosslinking points with respect to those present in the PCL-TES *** as-spun PCL-TES/BG fibers display excellent shape memory properties,in terms of shape fixity and shape recovery ratios,without the need of a thermal crosslinking *** particles confer in vitro bioactivity to PCL-based nanocomposite fibers and favor the precipitation of hydroxycarbonate apatite on the fiber *** cytocompatibility tests demonstrate that the addition of BG particles to PCL-based polymer does not inhibit ST-2 cell *** novel approach of using bioactive glasses not only for their biological properties,but also for the enhancement of shape memory properties of PCL-based polymers,widens the versatility and suitability of the obtained composite fibers for a huge portfolio of biomedical applications.

关键词： PCL-TES Bioactive glasses Bioactivity Shape memory polymers Electrospinning Benign solvents

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Graphene-Oxide Mediated Chemodivergent Ring-Opening of Cyclobutanols

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Chinese Journal of chemistry 2023年第11期41卷 1333-1340页

作者： Andrea Brunetti Angela Pintus Lorenzo Lombardi Alessandro Kovtun Federico Mascietti Francesco Bruno Enrico Ravera Manuela Melucci Giulio Bertuzzi Marco Bandini Dipartimento di Chimica“giacomo ciamician” Alma Mater StudiorumUniversitàdi BolognaVia Selmi 240126BolognaItaly Istituto per la Sintesi e la Fotoreattività(ISOF)–CNR Via Gobetti10140129BolognaItaly Magnetic Resonance Center(CERM) University of FlorenceVia L.Sacconi 650019 Sesto FiorentinoItaly department of chemistry“Ugo Schiff” University of FlorenceVia della Lastruccia 350019 Sesto FiorentinoItaly Center for Chemical Catalysis–C3 Alma Mater StudiorumUniversitàdi Bolognavia Selmi 240126BolognaItaly

The chemodivergent ring-opening of cyclobutanols is described under the carbocatalytic assistance of graphene oxide(GO).The protocol enables the synthesis of diversely functionalized dienes or indenes(26 examples)based on the amount of GO ***(XPS and ssNMR)as well as experimental investigations revealed a direct involvement of theπ-domains of GO in tuning the stability of carbocationic intermediates during the reaction.

关键词： Carbocatalysis C-C activation Graphene Carbocations Methodology and reactions

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