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  • Feng, Xinhao  (2)
  • Wu, Guomin  (2)
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  • 1
    Online Resource
    Online Resource
    Dynamic postpolymerization of 3D‐printed photopolymer nanocomposites: Effect of cellulose nanocrystal and postcure temperature
    Wiley ; 2018
    In:  Journal of Polymer Science Part B: Polymer Physics Vol. 56, No. 12 ( 2018-06-15), p. 935-946
    Details
    In: Journal of Polymer Science Part B: Polymer Physics, Wiley, Vol. 56, No. 12 ( 2018-06-15), p. 935-946
    Abstract: Cellulose nanocrystal (CNC) reinforced methacrylate (MA) resin nanocomposite was prepared by 3D stereolithography printing. A postcure process, where the printed nanocomposite was heat‐treated under different temperatures, was applied to improve the property of the printed nanocomposites. To investigate the effect of CNC and postcure temperature on the kinetic behavior of the postpolymerization of printed nanocomposites, Fourier‐transform infrared spectroscopy and differential scanning calorimetry measurement of the printed nanocomposites before and after postcure were analyzed. The postpolymerization of MA nanocomposites was promoted at a postcure temperature of 140 °C for the printed 0.5% CNC/MA nanocomposites compared to the printed MA resin. The addition of CNC retarded the polymerization of MA resin during 3D printing, resulting in poorer mechanical properties of the printed nanocomposites compared to the printed MA resin. However, after postcure, the mechanical properties of the printed nanocomposites were improved by the postpolymerization of the MA nanocomposites. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56 , 935–946
    Type of Medium: Online Resource
    ISSN: 0887-6266 , 1099-0488
    URL: Issue
    URL: Article
    DOI: 10.1002/polb.v56.12
    DOI: 10.1002/polb.24610
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 1473448-5
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  • 2
    Online Resource
    Online Resource
    Effect of lignin-containing cellulose nanofibrils on the curing kinetics of polymeric diphenylmethane diisocyanate (PMDI) resin
    Walter de Gruyter GmbH ; 2019
    In:  Holzforschung Vol. 73, No. 9 ( 2019-08-27), p. 879-887
    Details
    In: Holzforschung, Walter de Gruyter GmbH, Vol. 73, No. 9 ( 2019-08-27), p. 879-887
    Abstract: In order to increase the curing rate of polymeric diphenylmethane diisocyanate (PMDI) resin, different contents of lignin-containing cellulose nanofibrils (L-CNFs) were blended into the PMDI. Differential scanning calorimetry (DSC) was used to examine how the addition of L-CNFs influences the curing kinetics of PMDI resin. The activation energy ( E a ) of the curing reaction of PMDI/L-CNF systems was calculated using the Kissinger, Friedman and Flynn-Wall-Ozawa model-free methods. The results showed that E a values calculated by the aforementioned three methods varied in a similar trend with the increase in the L-CNF content. Adding L-CNFs could decrease the E a value of the curing reaction of PMDI and speed up the curing reaction. The acceleration of the cure rate of the PMDI resin upon the addition of L-CNFs may be attributable to the effective dispersion of the L-CNFs into the PMDI resin as well as the reaction between the hydroxyl (-OH) groups of the L-CNFs and the isocyanate (-NCO) groups of the PMDI.
    Type of Medium: Online Resource
    ISSN: 1437-434X , 0018-3830
    URL: Article
    DOI: 10.1515/hf-2018-0253
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2019
    detail.hit.zdb_id: 1466072-6
    SSG: 23
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