木质素/LDPE-EVA复合材料及其发泡材料的制备

Preparation of lignin/LDPE-EVA composition and foam

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。

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 （Tg） 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.