碱木质素和PUF的降解产物对聚氨酯材料结构和性能的影响

以碱木质素和聚氨酯泡沫(PUF)的降解产物为添加剂制备复合聚氨酯泡沫材料,并表征了微观结构、表观密度、压缩性能、保温性能等。结果显示,碱木质素可提高与复合基体之间的相容性,原因是其存在强烈的氢键缔合作用。扫描电镜测试显示,碱木质素和PUF的降解产物对材料的微观结构有很大的影响,加入碱木质素有利于提高压缩模量,其压缩模量为146.44 MPa,加入PUF的降解产物会降低压缩模量,其压缩模量为101.59 MPa,而没有加碱木素也没有加PUF降解产物的其压缩模量108.53 MPa。PUF的降解产物的添加降低了样品的保温性能,加入PUF的降解产物的样品的导热系数为PUF降解产物的样品的导热系数为0.032 5 W/(m.K)而不加PUF降解产物的样品的导热系数为0.022 6 W/(m.K)。

Influence of Alkaline Lignin and Degradation Products of Polyurethane Foam on Structure and Performance of Polyurethane Foam Composite

In order to study the influence of alkaline lignin and degradation products of polyurethane foam(DPPUF) on structure and performance of polyurethane foam composites(PUF),the reticulated polyurethane foam composites were prepared by using alkaline lignin and DPPUF as raw materials.The FT-IR results showed that compatibility of alkaline lignin and reticulated polyurethane increased due to the existence of strong hydrogen bonding association.SEM analysis indicated that addition of the alkaline lignin and DPPUF could impact the microstructures of PUF.In addition,compression modulus of PUF and the DPPUF increased with the increase of alkaline lignin and reached 146.44 MPa.However,the compression modulus of PUFs would decrease after the introduction of DPPUF and reached 101.59 MPa.Without the alkaline lignin and the DPPUF,the compression modulus of PUF was 108.53 MPa.The thermal conductivity of product with the renewable polyurethane foam is 0.032 5 W/(m · K) while the thermal conductivity of product without the renewable polyurethane foam is 0.022 6 W/(m · K).This showed that the renewable polyurethane foam decreased the thermal insulating property of PUF.