摘要
以三聚氰胺和多聚甲醛为原料、羟基封端聚二甲基硅氧烷(PDMS-OH)为改性剂,制得了一系列PDMS-OH接枝改性的三聚氰胺树脂(MF-PDMS)。考察了溶剂、PDMS-OH用量对MF-PDMS性能的影响以及PDMS-OH用量对MF-PDMS固化膜性能的影响。采用FTIR、~1HNMR、XPS、SEM-EDS对MF-PDMS的结构、表面化学组成进行了表征;用接触角测定仪、浸泡法分别测试了树脂的接触角和吸水性;采用TG测试了树脂的热稳定性。结果表明,以N,N-二甲基乙酰胺(DMAc)为溶剂,PDMS-OH与三聚氰胺、多聚甲醛可一步合成MF-PDMS。PDMS-OH的引入可高效地提高MF-PDMS的疏水性能和热稳定性,当PDMS-OH的用量为1%(以三聚氰胺物质的量计,下同)时,制备的MF-PDMS-01膜的水接触角为91.81°,表面自由能降至28.1mN/m,吸水质量分数降至2.83%,400℃时的质量残余率为50.44%、700℃时的质量残余率为16.60%。
A series of modified melamine-formaldehyde resins(MF-PDMS)grafted by hydroxyl terminated polydimethylsiloxane(PDMS-OH)were synthesized with melamine and paraformaldehyde as raw materials and PDMS-OH as modifier.The effects of solvent type and PDMS-OH dosage on the properties of MF-PDMS and PDMS-OH dosage on the properties of MF-PDMS curing films were investigated.The structure and surface chemical composition of MF-PDMS were characterized by FTIR,~1 HNMR,XPS and SEM-EDS.The hydrophobicity and thermal stability of MF-PDMS were evaluated by contact angle measurement,immersion method and TG.The results indicated that MF-PDMS was successfully obtained by one-step reaction from PDMS-OH,melamine and paraformaldehyde with N,N-dimethylacetamide(DMAc)as solvent.The introduction of PDMS-OH could efficiently improve the hydrophobicity and thermal stability of MF-PDMS.When the dosage of PDMS-OH was 1%(based on the molar of melamine,the same below),the prepared MF-PDMS-01 film had a water contact angle of 91.81°,surface free energy of 28.1 m N/m,and water adsorption mass fraction of 2.83%.The mass residue at 400 and 700℃were 50.44%and 16.60%,respectively.
作者
高于洋
刘绍英
王庆印
王公应
GAO Yuyang;LIU Shaoying;WANG Qingyin;WANG Gongying(Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,Sichuan,China;National Engineering Laboratory for VOCs Pollution Control Material&Technology,University of Chinese Academy of Sciences,Beijing 101408,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2020年第8期1567-1573,共7页
Fine Chemicals
基金
四川省科技支撑计划项目(2017GZ0252)。
关键词
三聚氰胺树脂
接枝
羟基封端聚二甲基硅氧烷
疏水性能
功能材料
melamine formaldehyde resin
grafting
hydroxyl terminated polydimethylsiloxane
hydrophobicity
functional materials
