Ultra-high molecular weight polyethylene (UHMWPE)had been widely discussed in terms of mechanical and wear-resisting performance, and gradually expanded to other functional fields. The key point was preserving and extending the disentangled UHMWPE chains, which could further obtain shish-kebab crystalline structure with highly orientation under extensional flow. In this paper, a designed intense stretching process was introduced to construct highly oriented and condensed shish-kebab crystalline structure for enhancing mechanical properties and in-plane thermal conductivity of HDPE/UHMWPE blends. The disentangled UHMWPE chains in gel state were firstly extended and better interacted with HDPE matrix through multistage stretching extrusion (MSE). After that, the condensed and highly oriented shish-kebab crystalline structure was constructed by MSE as well as uniaxial stretching, which also enlarged the long period, lamellar thickness, and retained high rate of lateral dimension. With the disentangled UHMWPE chains introduced and the designed intense stretching process, the tensile strength, Young's modulus and in-plane thermal conductivity increased to 237.8 MPa, 1312.8 MPas and 2.2 W/(m.K), respectively. This work could provide a new sight to the application of high-performance polyethylene blends.

超高分子量聚乙烯（UHMWPE）在机械性能和耐磨性能方面已被广泛讨论，并逐渐扩展到其他功能领域。关键是保留和延伸解开的UHMWPE链，这可以进一步获得在拉伸流动下具有高度取向的shish-kebab晶体结构。在本文中，引入了一种设计的强拉伸工艺来构建高度取向和凝聚的 shish-kebab 晶体结构，以提高 HDPE/UHMWPE 共混物的机械性能和面内热导率。解开的凝胶态 UHMWPE 链首先通过多级拉伸挤出 (MSE) 延伸并与 HDPE 基质更好地相互作用。在那之后，通过MSE以及单轴拉伸构建了凝聚且高度取向的shish-kebab晶体结构，这也扩大了长周期，片层厚度，并保留了较高的横向尺寸。随着解开的 UHMWPE 链的引入和设计的强烈拉伸工艺，拉伸强度、杨氏模量和面内热导率分别增加到 237.8 MPa、1312.8 MPas 和 2.2 W/(mK)。这项工作可以为高性能聚乙烯共混物的应用提供新的视角。s 模量和面内热导率分别增加到 237.8 MPa、1312.8 MPas 和 2.2 W/(mK)。这项工作可以为高性能聚乙烯共混物的应用提供新的视角。s 模量和面内热导率分别增加到 237.8 MPa、1312.8 MPas 和 2.2 W/(mK)。这项工作可以为高性能聚乙烯共混物的应用提供新的视角。