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Appl. Sci. 2017, 7(1), 55; doi:10.3390/app7010055

Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System

1
Key Laboratory of Synthesis of Functional Materials and Green Catalysis, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025, China
2
College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Giorgio Biasiol
Received: 5 November 2016 / Revised: 20 December 2016 / Accepted: 27 December 2016 / Published: 10 January 2017
(This article belongs to the Section Chemistry)
View Full-Text   |   Download PDF [7406 KB, uploaded 10 January 2017]   |  

Abstract

In order to comprehensively improve the strength, toughness, flame retardancy, smoke suppression, and thermal stability of polypropylene (PP), layered double hydroxide (LDH) Ni0.2Mg2.8Al–LDH was synthesized by a coprecipitation method coupled with the microwave-hydrothermal treatment. The X-ray diffraction (XRD), morphology, mechanical, thermal, and fire properties for PP composites containing 1 wt %–20 wt % Ni0.2Mg2.8Al–LDH were investigated. The cone calorimeter tests confirm that the peak heat release rate (pk–HRR) of PP–20%LDH was decreased to 500 kW/m2 from the 1057 kW/m2 of PP. The pk–HRR, average mass loss rate (AMLR) and effective heat of combustion (EHC) analysis indicates that the condensed phase fire retardant mechanism of Ni0.2Mg2.8Al–LDH in the composites. The production rate and mean release yield of CO for composites gradually decrease as Ni0.2Mg2.8Al–LDH increases in the PP matrix. Thermal analysis indicates that the decomposition temperature for PP–5%LDH and PP–10%LDH is 34 °C higher than that of the pure PP. The mechanical tests reveal that the tensile strength of PP–1%LDH is 7.9 MPa higher than that of the pure PP. Furthermore, the elongation at break of PP–10%LDH is 361% higher than PP. In this work, the synthetic LDH Ni0.2Mg2.8Al–LDH can be used as a flame retardant, smoke suppressant, thermal stabilizer, reinforcing, and toughening agent of PP products. View Full-Text
Keywords: polypropylene; layered double hydroxide; mechanical property; thermal stability; flame retardancy; composite polypropylene; layered double hydroxide; mechanical property; thermal stability; flame retardancy; composite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, L.; Zhang, M.; Zhou, B. Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System. Appl. Sci. 2017, 7, 55.

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