Methylol-functional benzoxazines as precursors for high-performance thermoset polymers: Unique simultaneous addition and condensation polymerization behavior
the novel monomers show two exothermic peaks associated with condensation reaction of methylol groups and ring‐opening polymerization of benzoxazines. The position of methylol group relative to benzoxazine structure plays a significant role in accelerating polymerization. Viscoelastic and thermogravimetric analyses of the crosslinked polymers reveal high Tg (274–343 °C) and excellent thermal stability
In situ sol–gel synthesis of silica reinforced polybenzoxazine hybrid materials with low surface free energy
作者:M. Selvi、M. R. Vengatesan、S. Devaraju、Manmohan Kumar、M. Alagar
DOI:10.1039/c3ra44511a
日期:——
in nature and possess a low surface freeenergy. For example, a PBS3 hybrid material (1 : 1 : 1 ratio of 4HBA-BZ : ICPTS : TEOS) exhibits a low surface freeenergy of 18.6 mJ m−2 which is lower than that of poly(tetrafluoroethylene) (22.0 mJ m−2). Further data obtained from thermal studies indicate that the hybrid PBZ possesses higher values of the glass transition temperature (Tg), thermal stability
在目前的工作中,使用二羟甲基官能的苯并恶嗪单体(4HBA-BZ),四乙氧基硅烷(TEOS)和3-(异氰酸根合丙基)三乙氧基硅烷(ICPTS)开发了具有低表面自由能的二氧化硅增强聚苯并恶嗪(PBZ-SiO 2)杂化材料。 )通过原位溶胶-凝胶过程。来自接触角测量的数据表明,杂化材料本质上是疏水的,并且具有低的表面自由能。例如,PBS 3杂化材料(1:1 1:1比例的4HBA-BZ:ICPTS:TEOS)表现出的低表面自由能为18.6 mJ m -2,低于聚四氟乙烯的表面自由能(22.0 mJ m −2)。从热学研究获得的更多数据表明,与纯PBZ相比,混合PBZ具有更高的玻璃化转变温度(T g),热稳定性和炭产率。