Abstract:

Lignin, a natural and degradable macromolecular material, was added into low density polyethylene-ethylene-vinyl acetate copolymer (LDPE-EVA) blend to prepare a lignin-based foam.Scanning electron microscope (SEM) micrographs showed that lignin particles were dispersed homogenously in the LDPE-EVA matrix and a transition layer was formed.Differential scanning calorimetry (DSC) curves detected only one glass-transition temperature (T_g) of the blend existing between those of lignin and LDPE-EVA, indicating improved compatibility of the blend.100 parts 55/45 LDPE-EVA with 20 parts lignin, 10 parts compatibilizer and 0.5 part crosslink agents at 130℃ showed optimal blending properties.Also, optimal mechanical properties of the lignin-based foam could be obtained.

摘要：

研究了天然可降解高分子材料木质素与LDPE-EVA的共混性能及进一步制备发泡材料的力学性能，共混物SEM图表明，在增容剂LDPE-g-MAH的作用下，木质素均匀地分散于LDPE-EVA基体中，并明显形成了一定的过渡层；DSC曲线分析表明，木质素/LDPE-EVA共混物有且只有一个介于两者吸热峰之间的吸热峰，进一步说明了两者具有较好的相容性。综合看来，10份LDPE-g-MAH增容20份含量的木质素与100份55/45的LDPE-EVA配以0.5份交联剂在130℃下混合具有较好的共混性能。同时,采用模塑发泡能得到具有优良力学性能和较好形貌的木质素/LDPE-EVA发泡材料。