摘要
针对酚醛树脂胶黏剂固化后脆性大,极易在竹材-树脂胶合界面形成应力集中,进而导致竹材胶合界面开裂问题,以纤维素纳米纤丝(CNF)和纤维素纳米晶须(CNW)为填料,通过用量的调控,以增韧酚醛(PF)树脂,改善竹材胶合界面性能,进而提高界面胶接强度。采用差示扫描量热仪(DSC)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等技术手段对改性前后酚醛树脂的性能和微观结构进行表征,并对竹胶合试件进行了胶合强度测试和胶合界面破坏形貌观察。结果表明:添加CNF和CNW虽不参与酚醛树脂胶黏剂固化过程,但对固化行为有一定影响,且对酚醛树脂有良好的增韧效果,进而能有效提高PF树脂与竹材界面胶接强度。当添加酚醛树脂胶黏剂固体含量0.5 wt%的CNF时,改性效果最优,PF树脂胶接试件的干、湿强度达到最大值,分别为13.56 MPa和7.61 MPa。本研究所采用的方法可有效改善竹材胶合制品界面性能,防止竹材胶合界面开裂,为提高竹材耐久性、拓展其应用范围提供良好的思路和借鉴。
In view of the brittleness of phenol formaldeyde(PF) resin adhesive after curing, which is easy to form stress concentration at the bamboo-resin bonding interface, and finally resulting in the cracking of bamboo bonding interface. In this study, nanocellulose fiber(CNF) and nanocellulose whisker(CNW) was applied as fillers to strengthen and toughen PF resin by regulation of the dosage, thus improving the performance of bamboo bonding interface, and improving the bonding strength at bamboo bonding interface. The properties and microstructure of PF resin before and after modification were characterized by differential scanning calorimetry(DSC), X-ray diffraction(XRD) and scanning electron microscope(SEM). The bonding strength of bamboo bonded specimens and the damage morphology of bonding interface were observed. The results showed that although the added CNF and CNW did not participate in the curing process of PF resin adhesive, it affected the curing behavior and had a good toughening effect on PF resin, which could effectively improve the bonding strength between PF resin and bamboo. When CNF with solid content of 0.5 wt% of PF resin adhesive was added, the modification effect was the best, the maximum dry and wet bonding strength of PF-bamboo specimen was 13.56 MPa and 7.61 MPa, respectively. The research of this project could effectively improve the interface performance of bamboo glued products, prevent the cracking of bamboo glued interface, and provide a good reference idea for improving the durability of bamboo and expanding its application scope.
作者
占宗炜
郜建设
蒋浩翀
王雯
严玉涛
金春德
ZHAN Zong-wei;GAO Jian-she;JIANG Hao-chong;WANG Wen;YAN Yu-tao;JIN Chun-de(College of Chemistry and Materials Science,Zhejiang A&F University,Hangzhou 311300,Zhejiang,P.R.China;China National Forest Products Group Company Limited,Beijing 100029,P.R.China)
出处
《林产工业》
北大核心
2023年第2期1-8,共8页
China Forest Products Industry
基金
国家自然科学基金青年基金(32101603)
浙江农林大学大学生科研训练项目(2021KX0044)。
关键词
酚醛树脂改性
纤维素纳米纤维
竹材胶合界面
增强增韧
胶合强度
Phenol formaldehyde resin modification
Nanocellulose
Bamboo bonding interface
Reinforcement and toughening
Bonding strength
作者简介
占宗炜,男,研究方向为木材科学与工程,E-mail:806813646@qq.com;通讯作者:严玉涛,男,讲师,研究方向为酚醛树脂改性、竹基复合材料,E-mail:yytao1988@163.com。
