摘要
为寻求较优的醋酸纤维素膜原料,选用巨龙竹纤维素(BC)、竹纸浆纤维素(PC)和微晶纤维素(MC)作为原料,乙酸酐作为乙酰化试剂,浓硫酸为催化剂,制备得到巨龙竹醋酸纤维素(BCA)、竹纸浆醋酸纤维素(PCA)和醋酸纤维素(MCA),再用3种醋酸纤维素制备膜材料,并对其性能进行表征分析。结果表明:巨龙竹纤维素(BC)活性羟基被乙酰基取代能力最强,乙酰化处理后制备的BCA乙酰基可达48.54%,略高于MCA(46.06%)和PCA (44. 13%),且所制得的BCA膜具有最好的力学性能,断裂伸长率与拉伸强度分别为2. 1%和45.97 MPa,显著强于PCA膜和MCA膜; BCA膜的透光率>90%,还具有最强的疏水性能,接触角可达92.9°;同时BCA膜的表面比较平滑,结构最为致密,热稳定性较高。因此,BC是较优的醋酸纤维素膜原料。
To explore the better raw material for cellulose acetate film,cellulose isolated from Dendrocalamus sinicus(BC),bamboo pulp cellulose(PC)and commercially available microcrystalline cellulose(MC)were used as raw materials,which respectively react with acetic anhydride used as acetylating agent in presence of concentrated sulfuric acid used as catalyst,to prepare bamboo cellulose acetate from D.sinicus(BCA),bamboo pulp acetylated cellulose(PCA)and microcrystalline cellulose acetate(MCA).Three cellulose acetate films were then prepared and their properties were investigated.The results showed that the active hydroxyl of BC had the most substituted activity by acetyl groups.The content of acetyl group of BCA could reach 48.54%,slightly higher than that of MCA(46.06%)and PCA(44.13%).The BCA film′s tensile strength and elongation at break of BCA film reached 45.97 MPa and 2.1%,which were significantly stronger than those of PCA film and MCA film.The transmittance of BCA film>90%.It also exhibited the strongest hydrophobicity,with the contact angle of 92.9°.Moreover,the surface of the BCA film was relatively smooth and the structure was the most compact.Additionally,BCA film also showed high thermal stability.Therefore,BC was the best raw material for the preparation of cellulose acetate film,while compared to PC and MC.
作者
石纯
李天诚
杨静
杨海艳
邓佳
史正军
SHI Chun;LI Tiancheng;YANG Jing;YANG Haiyan;DENG Jia;SHI Zhengjun(University Key Laboratory of Biomass Chemical Refinery&Synthesis,Southwest Forestry University,Kunming 650224,China;Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China,Southwest Forestry University,Kunming 650224,China)
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2018年第5期70-76,共7页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31760195
31560195)
云南省创新人才项目(2016HB005)
关键词
巨龙竹
醋酸纤维素
膜材料
性能研究
Dendrocalamus sinicus
cellulose acetate
membrane
characterization
作者简介
石纯(1994— ),女,江苏泰州人,硕士生,主要从事生物质能源研究工.;通讯作者:史正军,副教授,硕士生导师,研究领域为生物质资源转化;E-mail:shizhengjun1979@163.com。
