摘要
利用熔融挤出-注塑的方法制得乙酰化木粉(AWF)/低密度聚乙烯(LDPE)复合材料,在制备过程中分别将腰果酚基乙酸酯(CA)和环氧腰果酚基乙酸酯(ECA)增塑剂添加到复合材料中。对复合材料的力学性能、吸水率、表面能、增塑剂热迁移和热机械性能(TMA)进行了研究。结果表明:随着增塑剂含量的增加,材料的力学性能不断下降,但整体而言由CA制备的复合材料的力学强度相比更高;吸水率测试显示材料的疏水性能在增塑剂质量分数为5%时差别不大,但添加量为15%时由CA制备的材料具有更好的疏水性;接触角测试也验证了其界面极性最小。在85℃及100 min内ECA的热迁移常数(4.35×10-4)相比CA的(5.48×10-4)要小,同时随着时间延长至3 700 min时ECA在材料中的保留更好。TMA结果显示随着温度的增大材料的膨胀加剧,加入15%的ECA的复合材料在高温段的线膨胀系数(3 758μm/(m·℃))要明显高于对应的加入CA的材料的线膨胀系数(3 182μm/(m·℃))。
Composites of acetylated wood flour （ AWF）/low-density polyethylene （ LDPE） were prepared by extrusion-injection molding process, and cardanol acetate （ CA） and epoxy cardanol acetate （ ECA） were added respectively. Properties such as tensile strength and hydrophobic as well as surface energy, migration of plasticizers and thermal mechanical properties （ TMA） were studied. The results showed that the tensile strength of composites decreased with the increasing content of plasticizers, but tensile strength of all composites with CA were higher than that of composites with ECA. Composites with 5%plasticizers showed similar hydrophobicity, but composites with 15 % CA was more hydrophobic, and contact angle test showed the similar results. The migration test of plasticizers revealed ECA had lower transfer constant （4. 35 × 10^-4 ） than that of CA （5. 48 × 10^-4 ） at 85 ℃ in 100 min, and ECA retained more in the composites after 3 700 min. The result of TMA exhibited the inflation of composites intensified with increasing temperature, and composites with 15% ECA showed higher coefficient of linear expansion （3 758 μm/（m·℃）） than that of composites with CA （3 182 μm/（m·℃））.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2014年第6期100-104,共5页
Chemistry and Industry of Forest Products
基金
“十二五”国家科技支撑计划资助(2012BAD32B03)
