摘要
以聚己内酯(PCL)为基体,添加不同含量聚乳酸(PLA)熔融共混制备具有不同分散相形态的PCL/PLA共混物,利用超临界二氧化碳(scCO2)微孔发泡工艺制备不同发泡倍率和开孔率的PCL/PLA多孔材料用于吸油应用。针对边长3 mm正方体样品溶解度实验发现100 min后CO2在PCL中已达到饱和吸附状态。PLA分散相含量的增加显著增大了PCL/PLA共混物泡孔密度,并使共混泡孔尺寸减小且分布更加均匀;发泡温度升高6℃,泡孔尺寸增大50%,发泡倍率增大38%,开孔率减小了20%。PCL/PLA开孔材料具有明显的亲油疏水性,发泡倍率越高,疏水性越好;针对花生油和硅油的吸油实验发现材料吸油率与发泡倍率和开孔率整体呈正比,实际吸油量高于理论计算值,10次循环吸油测试后样品吸油率仅降低8.5%,材料吸油量与油品特性黏度关系不大。
In this paper, various polycaprolactone/polylactide(PCL/PLA) blends with different dispersed phasemorphologies were melt blended based on PCL matrix. Supercritical carbon dioxide(sc CO2) was used as physicalblowing agent to fabricate porous PCL/PLA samples with different expansion ratio and open-cell content bymicrocellular batch foaming process. According to the solubility experiment of a cube sample with a side length of 3 mm, it is found that CO2 has reached a saturated adsorption state in PCL after 100 min. The foam tests showed thatwith the increase of PLA contents, the pore size was decreased, the pore density was increased, and the poredistribution was more uniform. With the foaming temperature increased by 6℃, the pore size increased by 50%,theexpansion ratio increased by 38% and the open-cell content decreased by 20%. PCL/PLA open-cell material has obvious lipophilic and hydrophobic properties. The higher the foaming ratio, the better the hydrophobicityproperties. The oil absorption experiments for peanut oil and silicone oil showed that the oil absorption rate offoamed samples was proportional to the overall expansion ratio and open-cell content. In addition, the actual oilabsorption was higher than calculated theoretical values. After 10 cycles of oil absorption test, the oil absorption ofporous PCL/PLA samples was only reduced by 8.5%, and the oil absorption had little relationship with the oil’sintrinsic viscosity.
作者
李子辉
蒋晶
金章勇
蔡泊志
曹永俊
李倩
LI Zihui;JIANG Jing;JIN Zhangyong;CAI Bozhi;CAO Yongjun;LI Qian(International Joint Research Laboratory for Micro-Nano Moulding Technology,School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第12期5842-5853,共12页
CIESC Journal
基金
河南省科技攻关项目(202102210028)
河南省高端外国专家引进计划(HNGDB20200020)
郑州大学大学生创新创业训练计划重点项目(202010459051)。
关键词
超临界二氧化碳
聚己内酯
发泡
开孔
吸油
supercritical carbon dioxide
polycaprolactone
foaming
open-cell
oil absorption
