一种全生物基水溶性苯并噁嗪树脂:合成及热与表面性能

A water-soluble fully bio-benzoxazine:Synthesis and thermal&surface properties

使用虎杖苷作为酚源,糠胺作为胺源合成了全生物基苯并噁嗪单体(PDA-fa),采用^(1)HNMR和FTIR表征了单体的结构。以DSC和原位红外(In situ FTIR)研究了PDA-fa的固化行为,采用热机械分析(TMA)仪、TG和接触角测量仪测试了虎杖苷-糠胺基聚苯并噁嗪[Poly(PDA-fa)]膜的热性能及表面性能。结果表明,PDA-fa的固化峰值温度为183.4℃。Poly(PDA-fa)的玻璃化转变温度达到230℃(DSC)/231℃(TMA),5%和10%热失重温度分别为306和338℃,800℃残炭率高达61%。其膜的表面能为43.6 mJ/m^(2)。PDA-fa具有一定水溶性,其热聚合为经典的噁嗪环阳离子开环聚合,呋喃结构和连接单元中双键也可产生额外交联作用,有助于形成三维网络结构,并具备形成涂层膜的能力。随着固化程度提高,Poly(PDA-fa)膜表面更亲水。

A fully bio-based benzoxazine monomer(PDA-fa)was synthesized by using polydatin as phenol source and furfurylamine as amine source and characterized by ^(1)HNMR and FTIR.The curing behaviors of PDA-fa were investigated by DSC and in situ FTIR.Thermal and surface properties of polydatinfurfurylamine based polybenzoxazine[Poly(PDA-fa)]films were measured by thermomechanical analysis(TMA),TGA and contact angle meter.The results showed that PDA-fa exhibited an endothermic peak at183.4℃.The glass transfer temperature of Poly(PDA-fa)was 230℃(DSC)/231℃(TMA).The 5% and 10% mass loss temperatures were 306 and 338℃,respectively.The char yield at 800℃ was as high as 61%.The surface energy of film was 43.6 m J/m^(2).PDA-fa had a certain water solubility,and its thermal polymerization is the classical cationic ring-opening polymerization of oxazine ring.The furan structure and the double bond in the connecting unit could produce extra crosslinks,which contributed to the formation of three-dimensional network and had the ability to form a coating film.With the improvement of curing degree,the surface of Poly(PDA-fa)film became more hydrophilic.