Constructing multifunctional nanofiller with reactive interface in PLA/CB-g-DOPO composites for simultaneously improving flame retardancy, electrical conductivity and mechanical properties

Multifunctional polymer nanocomposites are one of the hottest topics in the field of materials science. Herein nanosized carbon black (CB) was functionalized by H2O2 hydroxylation and chemical grafting of phosphorous flame retardant. The obtained nanofiller hybrids (CB-g-DOPO) presented a high graft...

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Bibliographic Details
Published in:Composites science and technology 2020-03, Vol.188, p.107988, Article 107988
Main Authors: Wen, Xin, Liu, Zhiqi, Li, Zhi, Zhang, Jing, Wang, De-Yi, Szymańska, Karolina, Chen, Xuecheng, Mijowska, Ewa, Tang, Tao
Format: Article
Language:English
Subjects:
Carbon black
Conductivity
Cone calorimeters
Electrical resistivity
Elongation
Flame retardants
Functional composites
Grafting
Heat release rate
High-temperature properties
Hydrogen peroxide
Hydroxyl groups
Hydroxylation
Impact strength
Materials science
Mechanical properties
Nanocomposites
Polymer-matrix composites (PMCs)
Polymers
Stiffness
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Summary:Multifunctional polymer nanocomposites are one of the hottest topics in the field of materials science. Herein nanosized carbon black (CB) was functionalized by H2O2 hydroxylation and chemical grafting of phosphorous flame retardant. The obtained nanofiller hybrids (CB-g-DOPO) presented a high grafting degree to 37.89 wt%, and remained large numbers of active hydroxyl groups (CH–OH), which could covalently react with adscititious compatibilizer to promote its dispersion and interaction with poly(l-lactide) (PLA) matrix. The resultant PLA nanocomposites showed remarkably improved flame retardancy, electrical conductivity and mechanical properties. The limited oxygen index (LOI) was 29.3%; the UL-94 rating reached to V0; and the peak of heat release rate (PHRR) was decreased by 50% in cone calorimeter testing. Outstanding electrical conductivity was present with more than 4 wt% CB-g-DOPO. Besides, the nanocomposites displayed a good balance on stiffness and toughness, especially 8.7 and 2.5 times improvement on elongation at break and impact strength, respectively. The enhancement mechanism was discussed on the basis of the unique structure and surface composition of CB-g-DOPO. This work will be favorable to the designation and application of multifunctional polymer nanocomposites with high performances. [Display omitted]
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2019.107988