马来海松基环氧纳米复合材料的制备及性能研究

doi:10.3969/j.issn.0253-2417.2021.01.002

Abstract

Abstract:

Maleopimaric anhydride(MPA) was prepared from rosin by Diels-Alder addition, and then maleopimaric epoxy resin(MPA-ER) was prepared by esterification and closed-loop reaction. The structures of MPA and MPA-ER were characterized by FT-IR and ¹H NMR.A series of MPA-ER/MWCNTs composites were prepared by blending multi-wall carbon nanotubes(MWCNTs) with MPA-ER, the mechanical and thermal properties of the composites were characterized, and the effects of MWCNTs addition on the mechanical and thermal properties of maleopimaric epoxy nanocomposites were investigated. The results of FT-IR and ¹H NMR showed that MPA and MPA-ER were successfully prepared. MWCNTs were well dispersed in MPA-ER, and the cross-section had river-shaped texture features. The mechanical properties of MPA-ER/MWCNTs were significantly improved by adding MWCNTs. When the addition of MWCNTs was 1.2%(calculated by the mass of MPA-ER, similarly hereinafter), the mechanical properties of the composite MPA-ER/MWCNTs(1.2) were optimized. Its impact toughness, tensile strength, bending strength and elongation at break were 15.11 kJ/m², 40.42 MPa, 105.45 MPa and 14.80%, which increased by 159%, 160%, 102% and 135% compared with those of MPA-ER, respectively.At the same time, in cone calorimeter test, the peak heat release rate and carbon residue rate of MPA-ER/MWCNTs(1.2) composite were 324 kW/m² and 9.18%, respectively.Compared with MPA-ER, the peak heat release rate decreased by 14%, and the carbon residue rate increased by 68%, which indicated that the addition of MWCNTs also improved the thermal stability and flame retardancy of MPA-ER/MWCNTs.The improvement of flame retardancy of MPA-ER/MWCNTs(1.2) composites was mainly attributed to the effective increase of crosslinking density of epoxy resin by adding MWCNTs, and forming a relatively dense carbon layer in the interior of epoxy resin, and then the flame retardant effect was achieved by partially isolating the external heat and air.

Key words: rosin, epoxy resin, carbon nanotube, composites, flame retardance

CLC Number:

TQ35
S785

Pan TAO, Chengyu WU, Shiying MAO, Meixin WANG, Jian LI. Preparation and Properties of Maleopimaric-based Epoxy Nanocomposite[J]. Chemistry and Industry of Forest Products, 2021, 41(1): 7-14.

Figures/Tables 8

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Table 1

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Table 2

References 28

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环氧复合材料 epoxy composites	MWCNTs添加量/% MWCNTs contents	冲击韧性/(kJ·m^-2) impact toughness	拉伸强度/MPa tensile strength	弯曲强度/MPa bending strength	断裂伸长率/% elongation at break
MPA-ER	—	5.84	15.53	52.33	6.31
MPA-ER/MWCNTS(0.3)	0.3	7.76	17.89	56.98	7.14
MPA-ER/MWCNTS(0.6)	0.6	9.52	21.25	65.34	7.57
MPA-ER/MWCNTS(0.9)	0.9	11.39	32.21	87.07	10.15
MPA-ER/MWCNTS(1.2)	1.2	15.11	40.42	105.45	14.80
MPA-ER/MWCNTS(1.5)	1.5	14.50	26.11	104.21	12.81
MPA-ER/MWCNTS(1.8)	1.8	10.87	23.01	89.73	10.50

环氧复合材料 epoxy composites	点燃时间/s time to ignition	峰值热释放速率/ (kW·m^-2) peak heat release rate	到达峰值时间/s time to peak	火灾燃烧指数/ (kW·m^-2·s^-1) fire growth rate index	残炭率/% char residue
MPA-ER	27	376	200	1.88	5.45
MPA-ER/MWCNTs(1.2)	37	324	280	1.16	9.18

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Preparation and Properties of Maleopimaric-based Epoxy Nanocomposite

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