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  • Chen, Xuhuang  (3)
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  • 1
    Online Resource
    Online Resource
    Fluorosilicone resin as a high ultraviolet transmittance optical material
    Wiley ; 2020
    In:  Journal of Applied Polymer Science Vol. 137, No. 37 ( 2020-10-05)
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 137, No. 37 ( 2020-10-05)
    Abstract: In this study, hydrofluorosilicone oil with a cyclic structure ( ) and tetramethyl‐tetravinylcyclotetrasiloxane ( ) are synthesized through a hydrosilylation reaction with platinum as the catalyst to obtain high ultraviolet transmittance fluorosilicone. The curing process of fluorosilicone resin is monitored by Fourier transform infrared spectroscopy. The effects of different A values (the molar ratio of Si─H to vinyl) on the curing process, mechanical properties, glass transition temperature, crosslinking density, hydrophobicity, and UV transmittance are studied. The results demonstrate that with the increase in the A value, the initial curing temperature and the temperature at the completion of curing decrease, the tensile strength initially increases and then decreases, and the glass transition temperature and crosslinking density increase. Furthermore, the contact‐angle and UV transmittance initially increase and subsequently decrease, the maximum contact‐angle is 107.61°, which shows good hydrophobicity, and the maximum UV transmittance at 351 nm reaches 93.66%.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v137.37
    DOI: 10.1002/app.49102
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1491105-X
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  • 2
    Online Resource
    Online Resource
    Synthesis of Transition Metal Complexes and Their Effects on Combustion Properties of Semi-Rigid Polyvinyl Chloride
    MDPI AG ; 2021
    In:  Materials Vol. 14, No. 10 ( 2021-05-18), p. 2634-
    Details
    In: Materials, MDPI AG, Vol. 14, No. 10 ( 2021-05-18), p. 2634-
    Abstract: Using introduction of MoO42− and Fe3+, Cu2+, or Zn2+ into amphiphilic polymers (DN) via an ion-exchange reaction, different transition metal complexes, as retardants and smoke suppressants, including (DN)Mo, Fe(DN)Mo, Cu(DN)Mo, and Zn(DN)Mo were synthesized. Combined with the results of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR), it could be determined that ionic bonding of these ions with DN occurred. Subsequently, the influence of flame-retardant, smoke-suppression, and mechanical properties of (DN)Mo, Fe(DN)Mo, Cu(DN)Mo, and Zn(DN)Mo on polyvinyl Chloride (PVC) were tested. It was demonstrated that transition metal complexes of three metal elements, Fe(DN)Mo, Cu(DN)Mo, and Zn(DN)Mo, showed better flame retardancy, smoke suppression, and thermal stability as confirmed by microcalorimetry, limiting oxygen index (LOI), smoke density, and thermogravimetric analysis (TGA) tests, in which Cu(DN)Mo worked best due to the Lewis acid mechanism and reductive coupling mechanism. Scanning electron microscopy (SEM) showed that the addition of (DN)Mo, Fe(DN)Mo, Cu(DN)Mo, and Zn(DN)Mo promoted the formation of a dense carbon layer on the PVC surface during combustion, which could protect the interior PVC. The addition of these transition metal complexes hardly impaired the mechanical properties of PVC.
    Type of Medium: Online Resource
    ISSN: 1996-1944
    URL: Article
    DOI: 10.3390/ma14102634
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2487261-1
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  • 3
    Online Resource
    Online Resource
    Model-free cure kinetics of additional liquid silicone rubber
    Elsevier BV ; 2020
    In:  Thermochimica Acta Vol. 688 ( 2020-06), p. 178584-
    Details
    In: Thermochimica Acta, Elsevier BV, Vol. 688 ( 2020-06), p. 178584-
    Type of Medium: Online Resource
    ISSN: 0040-6031
    URL: Article
    DOI: 10.1016/j.tca.2020.178584
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 1500974-9
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