用DEPT135测定酚醛树脂的微细结构和组成

为准确了解线形酚醛树脂的组成和微细结构,利用高分辨率核磁共振技术中近年发展起来的DEPT135测定方法,测定了线形酚醛树脂的有关结构参数:o-o位缩聚百分率、o-p位缩聚百分率、p-p缩聚百分率;参与缩聚反应活性点中o位占据百分率、p占据百分率以及各个活性点参与反应百分率;同核双邻位缩聚值;不同类型酚醛树脂的平均核体数。其中,同核双邻位缩聚值、活性点参与反应百分率及苯酚和间甲酚平均核体数的计算方法是笔者建立的,即:Ro-o=100-Po-p-2Pp-p,其中:Po-p=SⅠ+SSⅡⅡ+SⅢ×100%;Pp-p=SⅠ+SSⅡⅢ+SⅢ×100%。

Investigation on the components and structural parameters of novolac resin through DEPT135

A series of structural parameters and component parameters of novolac resin were concluded through DEPT 135 spectrum of typical novolac resin with low or high mass fraction(MF),including o-o,o-p and p-p condensation percentage of total condensation reaction;o-,p-percentage of active point in condensation reaction;reaction percentage of different active points;condensation ratio(Ro-o)of phenolic resin in double ortho way and the average number of resin.Ro-o,the average number of phenol-formaldehyde condensation(PFC),o-cresol-formaldehyde condensation(o-CFS),m-cresol-formaldehyde condensation(m-CFS)and p-cresol-formaldehyde condensation(p-CFS)were calculated by the method provided by ourselves,such as:Ro-o=100-Po-p-2Pp-p,in whichPo-p=SⅡSⅠ+SⅡ+SⅢ×100%;Pp-p=SⅢSⅠ+SⅡ+SⅢ×100%.