申请人提出高频电场协同正应力场聚烯烃低温塑化加工新方法：非极性聚烯烃材料在足够强的正应力场作用下局部将产生变形、缺陷而呈现众多微界面，这些微界面由于分子链被扭曲甚至错位、断裂而呈电极性，进而实现聚烯烃在高频电场热效应下的低温塑化过程。课题将构建正应力场作用下聚烯烃固体微界面介电损耗系数关联模型及聚合物在高频电场与应力协同作用下低温塑化输运动力学模型，揭示正应力场作用下聚烯烃固体微裂纹扩展对微界面介电损耗系数的影响规律，探索高频电场、正应力场、加工温度等多物理场协同作用聚烯烃低温塑化输运机理，利用自行研制聚合物高频电场与应力场协同低温塑化加工实验设备，研究加工参数对聚烯烃低温塑化产物综合物理性能的影响机制，实现高频电场与正应力场协同低温塑化加工过程调控。推动聚合物低温塑化加工领域基础理论研究的发展。

A new method of polyolefin plasticizing processing in low temperature by synergizing high-frequency electric field with positive stress field is proposed in this study. That is non-polar polyolefin materials will generate certain local deformation, defects, forming a number of micro-interface under larger enough positive stress field. And the interface is electrode since the molecular chains have been distorted, dislocation, or rupture, which will realize the polyolefin plasticizing in low temperature under the thermal effect of high-frequency electric field. The association model based on polyolefin solid micro-interface and dielectric loss coefficient under positive stress field as well as the dynamic models of polymer plasticizing and conveying in low temperature by synergizing high-frequency electric field with stress field will be established in this subject. The influence rules of polyolefin solid micro-crack extension on the dielectric loss coefficient of micro-interface under positive stress field will be revealed. The polyolefin plasticizing and conveying mechanism in low temperature by synergizing multi-field such as high-frequency electric field, positive stress field, processing temperature and so on will be explored. A self-designed laboratory equipment of polymer plasticizing processing in low temperature by synergizing high-frequency electric field with stress field will be used to investigate the influencing mechanism of processing parameter on the comprehensive physical properties of the polyolefin plasticizing product processed in low temperature. The controllable processing of polyolefin by synergizing high-frequency electric field with positive stress field will be realized. Furthermore, the study will promote the development of basic theoretical research on polymer processing in low temperature.