摘要
以松香基甲基丙烯酸缩水甘油酯(RGMA)和糠醛基单体甲基丙烯酸四氢糠基酯(THFMA)为硬单体,油脂基单体甲基丙烯酸月桂酯(LMA)为软单体,通过自由基聚合反应得到THFMA-10、THFMA-20和RGMA-20系列聚丙烯酸酯共聚物,并通过光固化反应制备半互穿交联网络光固化压敏胶。采用红外光谱(FT-IR)和凝胶渗透色谱(GPC)对光固化压敏胶进行结构表征,并对其热性能、紫外光吸收性能、力学性能和流变性能进行分析。研究结果表明:3种共聚物的数均相对分子质量(M_(n))位于40000~60000之间,分散性指数(PDI)分布在2~3之间,M n对压敏胶黏附性能的影响可忽略不计;FT-IR分析证明光固化压敏胶成功制备;DSC分析证明样品中半互穿网络结构与共聚物具有良好的相容性,以二缩三乙二醇二丙烯酸酯(TPGDA)作交联剂,用量5%时,丙烯酸酯共聚物经交联光固化后弹性和内聚性均显著提高,相比于THFMA,由RGMA单体制得的压敏胶分子链的刚性更高;TG分析表明光固化后压敏胶的热稳定性明显提升。以RGMA为硬单体所制备的压敏胶的紫外光吸收性能优于THFMA,其在紫外光防护应用方面更具有优势。相比二官能度TPGDA,三官能度交联剂季戊四醇三丙烯酸酯(PETA)制备的光固化压敏胶力学性能显著提高,RGMA基共聚物加入9%的交联剂PETA,可有效平衡光固化压敏胶的初黏力(12.34 N)、180°剥离强度(264 N/m)和持黏性能(持黏时间>24 h)。光固化压敏胶的储能模量(G′)与损耗模量(G″)均随着频率的增大而升高,光固化半互穿网络结构改善了压敏胶性能,THFMA-10系列压敏胶光固化前后均满足Dahlquist临界线,具有较好的压敏性能。
Series polyacrylate copolymers of THFMA-10,THFMA-20 and RGMA-20 were obtained by free radical polymerization using rosin-based glycidyl methacrylate(RGMA)and furfural-based monomer tetrahydrofurfuryl methacrylate(THFMA)as hard monomers and oil-based monomer lauryl methacrylate(LMA)as soft monomers.Semi-interpenetrating crosslinked network photocuring pressure-sensitive adhesive was prepared through photocuring reaction.The structure of the photocurable pressure-sensitive adhesive was characterized by infrared spectroscopy(FT-IR)and gel permeation chromatography(GPC),and its thermal properties,ultraviolet ray(UV)absorption properties,mechanical properties and rheological properties were analyzed.The results showed that the relative molecular weight(M n)of the three copolymers was between 40000 and 60000,and the dispersion index(PDI)was between 2 and 3.The influence of M_(n) on the adhesion properties of the pressure-sensitive adhesive was negligible.FT-IR analysis indicated that the photocurable pressure-sensitive adhesive was successfully prepared.The DSC analysis results showed that the interpenetrating cross-linked network had good compatibility with the copolymer.Triethylene glycol diacrylate(TPGDA)was used as crosslinking agent,and the elasticity and cohesion of acrylate copolymer were improved significantly after cross-linking photocuring with 5%of TPGDA.Compared to THFMA,the molecular chain rigidity of the pressure sensitive adhesive obtained by RGMA monomers was higher.TG analysis showed that the thermal stability of the pressure sensitive adhesive was obviously improved after photocuring.The UV absorption performance of the pressure-sensitive adhesive prepared with RGMA as the hard monomer was better than that of THFMA,and it had more advantages in the application of UV protection.Compared with the bifunctional TPGDA,the mechanical properties of the photocurable pressure sensitive adhesive prepared by the tri-functional crosslinking agent pentathritol tetraacrylate(PETA)were significantly improved.The RGMA-based copolymer was added with 9%crosslinking agent PETA,which could effectively balance the initial adhesion(12.34 N),180°peel strength(264 N/m)and adhesion properties(adhesion time 24 h).The energy storage modulus(G′)and loss modulus(G″)of the photocured pressure-sensitive adhesive increased with the increase of frequency.The structure of the photocured semi-interpenetrating network improved the performance of the pressure-sensitive adhesive.The THFMA-10 series of pressure-sensitive adhesive met the Dahlquist critical boundary before and after photocuring,indicating good pressure-sensitive performance.
作者
祁思迈
罗通
刘美红
王春鹏
储富祥
王基夫
QI Simai;LUO Tong;LIU Meihong;WANG Chunpeng;CHU Fuxiang;WANG Jifu(Institute of Chemical Industry of Forest Products,CAF,Key Lab.of Biomass Energy and Material,Jiangsu Province,Key Lab.of Chemical Engineering of Forest Products,National Forestry and Grassland Administration,National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass,Nanjing 210042,China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2023年第5期32-40,共9页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31971600)。
