To achieving highly efficient reuse of commingled waste plastic films (CWPF) in high-density polyethylene (HDPE), elastomer-olefin block copolymer (OBC) was adopted to improve the compatibility between CWPF and HDPE, and solid-state drawing was further used to improve the mechanical properties of the blends. The results showed that OBC could form core-shell structure with CWPF, as a bridge layer to simultaneously connect CWPF and HDPE, and form epitaxial crystallization induced by HDPE crystals, thereby greatly enhancing the compatibility between CWPF and HDPE, and improving the tensile strength, elongation at break and impact strength of HDPE/CWPF blend. In the subsequent solid-state drawing, depending on the fluidity of OBC at the drawing temperature of 100 °C, more CWPF were covered, efficiently reducing the defects caused by CWPF along the transverse direction (TD) and increasing the elongation at break of the stretched sheet along this direction. With the increase of draw ratio, lamellae in fibril along TD and shish-kebab-like structure along the flow direction (FD) formed, greatly improving the tensile strength of the blend along both TD and FD. And the long period (L_p), amorphous region (L_a) and lateral dimension (L_lateral) decreased, but lamella thickness (L_c) increased. This work provides good bases for obtaining novel and low-cost HDPE based material as well as high-effect recycling of CWPF.

为实现混合废塑料薄膜（CWPF）在高密度聚乙烯（HDPE）中的高效再利用，采用弹性体-烯烃嵌段共聚物（OBC）提高CWPF与HDPE的相容性，并进一步采用固态拉伸技术改善共混物的力学性能。结果表明，OBC可以与CWPF形成核壳结构，作为桥接层同时连接CWPF和HDPE，形成HDPE晶体诱导的外延结晶，从而大大增强CWPF和HDPE的相容性，提高抗拉强度， HDPE/CWPF共混物的断裂伸长率和冲击强度。在随后的固态拉丝中，根据拉丝温度100℃时OBC的流动性，覆盖了更多的CWPF，有效地减少了由 CWPF 沿横向 (TD) 引起的缺陷，并增加了拉伸片材沿该方向的断裂伸长率。随着拉伸倍数的增加，原纤中沿TD方向的薄片和沿流动方向（FD）的类似烤肉串的结构形成，大大提高了共混物沿TD和FD方向的拉伸强度。和长期（L_p )、非晶区(La ₎和横向尺寸( _Llateral )减小，但薄片厚度(Lc ₎增加。该工作为获得新型低成本的HDPE基材料以及CWPF的高效回收利用提供了良好的基础。