Y. Q. Shi, Z. Gui, B. Yu, R. K. K. Yuen, B. B. Wang and Y. Hu (2015) Graphite-like carbon nitride and functionalized layered double hydroxide filled polypropylene-grafted maleic anhydride nanocomposites: Comparison in flame retardancy, and thermal, mechanical and UV-shielding properties. Journal/Composites Part B-Engineering 79 277-284. [In English]
Web link: http://dx.doi.org/10.1016/j.compositesb.2015.04.046
Keywords: Polymer-matrix composites (PMCs), Thermal properties, Thermomechanical, Optical properties/techniques, VISIBLE-LIGHT, PHOTOCATALYTIC ACTIVITY, LDH NANOCOMPOSITES, NANOSHEETS, FLAMMABILITY, STABILITY, GRAPHENE, BEHAVIOR, STEP, INTERCALATION
Abstract: Graphite-like carbon nitride (g-C3N4) and borate modified layered double hydroxides (LDH-B) were successfully fabricated by thermal pyrolysis and modified aqueous miscible organic solvent treatment methods, respectively. Then these nano-additives were introduced to prepare polypropylene-grafted maleic anhydride (PP-g-MA)/g-C3N4 and PP-g-MA/LDH-B nanocomposites using a modified solvent mixing strategy. Several important parameters of the nanocomposites including thermal, mechanical and UV-blocking properties were investigated. Results indicated that pure g-C3N4 exhibited 347.6 and 427.2 degrees C increase in onset decomposition temperature under air and nitrogen conditions, respectively, compared with LDH-B. In case of PP-g-MA nanocomposites, both T-10 and T-50 (the temperature at 10% and 50% weight loss, respectively) were improved by 14.6 and 27.7 degrees C, respectively, by the addition of g-C3N4 while those only increased by 2.3 and 17.8 degrees C upon introducing LDH-B. Furthermore, PP-g-MA/g-C3N4 system showed a remarkable increment (9.8 degrees C) in crystallization temperature while an increase of 4.2 degrees C for PP-g-MA/LDH-B nanocomposite. Introducing g-C3N4 and LDH-B into PP-g-MA led to a reduction of 28% and 19% in pHRR, respectively. It was noted that the incorporation of g-C3N4 caused significant improvement in storage modulus from 2445.0 MPa for neat PP-g-MA to 2783.5 MPa for PP-gMA/g-C3N4 while that of PP-g-MA/LDH-B was dramatically decreased by 27.3%. Optical results indicated that PP-g-MA/g-C3N4 was rendered fascinating UV adsorption ability relative to PP-g-MA/LDH-B. It is expected that the novel two-dimensional nanomaterial could bring new creativity into polymer composites. (C) 2015 Elsevier Ltd. All rights reserved.

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