DAAM/ADH 接枝交联复合改性淀粉木材胶黏剂的制备及表征

Preparation and characterization of DAAM/ADH grafting-crosslinkingcomposite modified starch-based adhesive for wood

以硝酸铈铵(CAN)为引发剂,将双丙酮丙烯酰胺(DAAM)接枝到玉米淀粉上,通过DAAM的酮羰基(C=O)与己二酸二酰肼(ADH)间的酮肼交联反应,制备了DAAM/ADH接枝交联复合改性淀粉胶黏剂。通过胶黏剂的接枝率、接枝单体分布以及刨花板性能确定了最佳DAAM添加量,利用FT-IR、TGA和SEM表征了接枝和交联改性对胶黏剂性能与结构的影响。结果表明,当DAAM添加量为45 g时效果最佳,接枝率为16.75%,DAAM在淀粉上的分布最均匀,制备的刨花板断裂模量为10.56 MPa,弹性模量为1741.33 MPa,吸水厚度膨胀率为8.5%,接枝和交联反应成功进行,并且提高了胶黏剂的储藏稳定性、抵抗破坏的能力和热稳定性。

Taking cerium ammonium nitrate(CAN)as initiator,diacetone acrylamide(DAAM)is grafted onto corn starch,a DAAM/ADH grafting-crosslinking composite modified starch-based adhesive is prepared through the ketohydrazide crosslinking reaction between ketocarbonyl group of DAAM and adipic dihydrazide(ADH).The optimum dosage of DAAM is determined by the grafting rate of the adhesive,the distribution of graft monomers and the performance of particleboard.The influences of grafting and crosslinking modification on the performance and structure of the adhesive are characterized by means of FT-IR,TGA and SEM.Results show that the best effect is achieved when the dosage of DAAM is 45 g.The grafting rate is 16.75%,and DAAM distributes most uniformly on starch.The rupture modulus and elasticity modulus of the prepared particleboard is 10.56 MPa and 1741.33 MPa,respectively,and the expansion rate of the water-absorbing thickness is 8.5%.It is verified that the grafting and crosslinking reactions have successfully carried out,and the storage stability,damage resistance and thermal stability of the adhesive are improved.