CELLULOSE ESTERS FROM BIRCH KRAFT PULPS-NEW BIOMATERIALS FOR BARRIER COATING
In the present study cellulose fatty acid esters were synthesized and characterized from chemical pulps,with different hemicellulose contents.We proceeded then to prepare and characterize paperboard coatings based on these materials.The cellulose esters obtained were characterized by FTIR and 31P NMR.The degree of substitution was found to increase from 0.8 to 2.8,with increasing fatty acid chloride stoichometry.The coatings were clearly hydrophobic and the barrier properties importantly were found not to vary significantly at all between the cellulose substituents and the degrees of substitution.Water contact angle values were over 90°.Hydrophobicity was also confirmed by low water absorption into the coated boards; the values being similar to those of commercial ones.The best water vapor barrier properties,i.e.the lowest water vapor transmission rates (WVTR) were obtained for the coatings prepared from the palmitoyl esters of the low hemicellulose content pulp cellulose.This compound was comparable to those of commercial PE- and PLAcoated boards.The cellulose ester coated boards were also good oil and grease barriers.
cellulose fatty acid ester birch kraft pulp degree of substitution paperboard coating barrier
Riku A.Talja Tuomas P.S.Kulomaa Sara Labafzadeh Lasse E.Kyll(o)nen Alistair W.T.King Ilkka Kilpel(a)inen Kristiina Poppius-Levlin
VTT Technical Research Centre of Finland,P.O.Box 1000,FI-02044 VTT,Espoo,Finland Laboratory of Organic Chemistry,University of Helsinki,P.O.Box 55,FI-00014,Finland. Laboratory of Organic Chemistry,University of Helsinki,P.O.Box 55,FI-00014,Finland.
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1394-1398
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）