The unsaturated link occurs in a cyclic system . 在环体系中存在不饱和键。
The molecules of soft sections of sbs elastomers are not satuated and is easily to be oxidized . it is highly possible to create degradation by manufacturing in high temperature and high shearing rate Sbs软质段分子段有不饱和键,容易被氧化,高温或高剪切率加工产生材料降解degradation可能性高
The modification of ( alkyl ) phenolic resins via epoxidation or with rosin , petroleum resins , and other organic compounds or polymers containing unsaturated double bond were discussed respectively , mainly dealing with modification mechanism , modification methods and their applications 分别讨论了(烷基)酚醛树脂的环氧化改性、松香改性、石油树脂改性及其他含不饱和键的化合物或聚合物改性,主要包括改性原理、改性方法及其应用情况。