去除木质素木材/聚甲基丙烯酸甲酯复合材料制备及性能研究

doi:10.3969/j.issn.0253-2417.2022.06.003

Abstract

Abstract:

The delignified wood(DW) was impregnated by methyl methacrylate(MMA) to obtain lignin-removed wood/poly(methyl methacrylate)(DW/PMMA) composite material through in-situ polymerization. The properties of DW/PMMA composite materials were investigated. The results showed that the removal ratio of different lignin had a greater impact on the properties of wood, and the impact was more significant with the increasing removal ratio of lignin. The density of DW/PMMA composite was significantly higher than that of non-impregnated wood. Especially when the lignin removal ratio reached a high level(H-DW), the density of the composite material could reach 1.15 g/cm³, which was close to that of pure PMMA. Compared with DW, DW/PMMA had lower volumetric moisture absorption and water absorption expansion coefficient, and incremental volumetric expansion resistance, which indicated that the impregnation of MMA effectively improved the dimensional stability of DW. The DW/PMMA exhibited better mechanical property than that of the untreated wood/PMMA. Dynamic thermomechanical thermal analysis showed that the filling of PMMA effectively increased the rigidity of the prepared composite material.The DW/PMMA composites prepared in this study had excellent dimensional stability and mechanical properties. Among them, the bending strength of L-DW/PMMA impregnated with low lignin removal rate wood(L-DW) was 122.6 MPa, the bending modulus was 10 302.41 MPa, and the compression modulus was 5 492.14 MPa, which was more excellent than that of the untreated wood/PMMA.

Key words: delignified wood, MMA impregnation modification, in-situ polymerization, comprehensive performance

CLC Number:

TQ35

Fucheng XU, Mei LI, Jianling XIA, Lina XU, Haiyang DING, Shouhai LI. Preparation and Properties of Lignin-removed Woods/Poly(Methyl Methacrylate) Composites[J]. Chemistry and Industry of Forest Products, 2022, 42(6): 17-23.

Figures/Tables 5

Table 1

Fig.1

Table 2

Table 3

Fig.2

References 17

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样品¹⁾ sample	酸不溶木质素质量分数/% mass fraction of acid insoluble lignin	木质素去除率/% lignin removal ratio
未处理木材untreated wood	22.8±0.9	0
L-DW	20.82±1.03	8.7
M-DW	11.01±1.76	51.7
H-DW	0.62±0.03	97.3

样品 ample	密度/(g·cm^-3) density		Δm/%	α_M/%		α_W/%		R_M/%	R_W/%
样品 ample	浸渍前 before impregnation	浸渍后 after impregnation	Δm/%	浸渍前 before impregnation	浸渍后 after impregnation	浸渍前 before impregnation	浸渍后 after impregnation	R_M/%	R_W/%
未处理木材untreated wood	0.47	0.91	110.22±14.75	3.98	2.50	14.40	10.06	0.588	0.431
L-DW	0.42	0.94	109.44±15.17	4.20	3.44	17.60	12.86	0.221	0.368
M-DW	0.32	0.96	125.46±11.14	4.47	3.06	21.23	13.04	0.460	0.628
H-DW	0.25	1.15	142.89±12.56	5.57	3.66	43.17	21.22	0.522	1.035

样品 sample	抗弯强度/MPa bending strength	抗弯模量/MPa flexural modulus	顺纹压缩强度/MPa compression strength along the grain	压缩模量/MPa compression modulus	硬度 hardness
未处理木材untreated wood	91.61±8.29	8777.08±1506.14	46.31±0.72	4006.12±575.76	45.6±2.0
L-DW	80.47±7.13	7294.54±551.92	38.52±3.94	3765.24±487.49	39.4±1.2
M-DW	54.37±6.20	3966.82±264.56	10.14±2.36	1527.67±320.67	28.9±2.1
H-DW	26.63±3.39	1340.36±264.94	3.49±1.30	94.81±20.10	9.2±0.7
未处理木材/PMMA untreated wood/PMMA	114.04±4.65	9979.51±1157.03	86.97±3.35	4798.85±385.19	85.8±0.5
L-DW/PMMA	122.6±3.49	10302.41±551.25	83.55±4.75	5492.14±637.31	81.6±1.8
M-DW/PMMA	77.24±7.58	5954.23±275.15	76.45±5.25	4305.66±1448.84	82.1±0.9
H-DW/PMMA	73.06±3.70	6221.22±731.32	73.75±3.74	3065.84±312.40	88.7±2.9

Preparation and Properties of Lignin-removed Woods/Poly(Methyl Methacrylate) Composites

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