木材科学与技术2024，Vol.38Issue(5)：39-49,11.DOI:10.12326/j.2096-9694.2024068
木薯淀粉-聚乙烯醇胶黏剂的合成与性能
Synthesis and Properties of Cassava Starch-Polyvinyl Alcohol Adhesive
摘要
Abstract
Since starch is a macromolecular polymer,adhesives directly prepared from starch typically exhibit poor water resistance.To improve its water resistance,the authors selected three types of acids as catalysts(formic acid,acetic acid,and sulfuric acid)to hydrolyze cassava starch,and then polymerized it with polyvinyl alcohol to prepare formaldehyde-free cassava starch-polyvinyl alcohol(CS-PVA)wood adhesives for wood products.The effect of formic acid concentration on the adhesive's performance was explored by evaluating its basic properties,including viscosity and solid content.Structural analysis was carried out using X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),carbon nuclear magnetic resonance spectroscopy(13C-NMR),X-ray photoelectron spectroscopy(XPS),and scanning electron microscopy(SEM).Differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA)were employed to characterize the curing performance,while wettability was assessed through contact angle measurements.The results showed that acid-catalyzed starch degradation significantly increased its interaction with PVA,promoting the formation of cross-linked structures through ether and hydrogen bonds.These cross-links effectively inhibited the penetration of water molecules,thereby improving the resin's water resistance.SEM observations indicated that the structure of the degraded CS-PVA adhesive was denser and more stable than that of the non-degraded counterpart.Notably,when 1％formic acid was used as the catalyst,the plywood samples exhibited dry shear strength,24-hour cold-water shear strength,and 3-hour hot-water(63℃)shear strength values of 2.45 MPa,1.31 MPa,and 0.93 MPa,respectively,which met the requirements of the national standard GB/T 9846-2015"Plywood for general use"for Type II plywood.These shear strengths represented improvements of 41.6％,151.9％,and 66.1％,respectively,compared to plywood bonded with non-degraded starch resin.These findings indicate that starch degradation significantly enhances the water resistance of CS-PVA adhesives while maximizing their environmental friendliness and strength.关键词
木薯淀粉-聚乙烯醇树脂/木材胶黏剂/结构与性能/交联改性/耐水性/胶合强度Key words
cassava starch-polyvinyl alcohol resin/wood adhesive/structure and properties/crosslinking modification/water resistance/bonding strength分类
化学化工引用本文复制引用
沈威,王婷,茶联红,张俊,夏炎,杜官本,邓书端..木薯淀粉-聚乙烯醇胶黏剂的合成与性能[J].木材科学与技术,2024,38(5):39-49,11.基金项目
云南省基础研究重点项目"木薯淀粉接枝共聚物胶黏剂的合成反应、胶接机理及结构调控机制"(202301AS070043) （202301AS070043）
高等学校学科创新引智计划"木材科学与技术学科创新引智基地"(D21027) （D21027）
杜官本院士工作站"云南省杜官本院士工作站"(YSZJGZZ-2020052) （YSZJGZZ-2020052）
云南省农林联合重点项目"环氧单宁-淀粉共缩聚泡沫的制备与应用基础研究"(202401BD070001-029) （202401BD070001-029）
国家级大学生创新创业训练计划项目"基于接枝共聚的木薯淀粉基胶黏剂的合成与性能研究"(20211364042). （20211364042）
