目的 研制可降解新型复合材料，以缓解传统石油基材料带来的环境污染。方法 以高密度聚乙烯(HDPE)为基材，热塑性淀粉(TPS)为改性剂和添加剂，采用熔融共混法制备TPS质量分数为0，10%，20%，30%和40%的复合片材。结果 通过分析比较TPS含量对TPS/HDPE片材物理性能的影响发现，TPS的加入降低了材料的韧性和塑性，增加了材料的刚性;当TPS质量分数达到40%时，与HDPE相比，拉伸强度下降了52.3%，断裂伸长率减少了90%以上，弯曲强度和弯曲模量分别提高了100.2%和70.5%。红外光谱分析显示在1200 cm⁻¹处出现了新峰。DSC分析表明材料的熔融温度由136.1 ℃降低为132.7 ℃。当TPS质量分数为40%时，复合材料的疏水性最好。结论 加入一定量的TPS可以改善HDPE的刚性和疏水性，为制备高性能淀粉基食品接触材料提供了一定的理论依据。

The work aims to develop new biodegradable composite materials to alleviate environmental pollution caused by traditional petroleum-based materials. With high density polyethylene (HDPE) as substrate and thermoplastic starch (TPS) as modifier and additive, the composite sheet with TPS content of 0, 10%, 20%, 30% and 40% was prepared by melt blending. The influence of TPS content on the physical properties of TPS/HDPE sheet was analyzed and compared. It was found that the addition of TPS reduced the toughness and plasticity and increased the rigidity of the material. When TPS content reached 40%, the tensile strength decreased by 52.3% compared with HDPE, and the elongation at break decreased by over 90%, while the bending strength and bending modulus increased by 100.2% and 70.5% respectively. Infrared spectral analysis showed that a new peak was found at 1200 cm-1. DSC analysis showed that the melting temperature of the material decreased from 136.1 ℃ to 132.7 ℃. When the content of TPS was 40%, the hydrophobicity of composites was the best. The study shows that the addition of certain amount of TPS could improve the rigidity and hydrophobicity of HDPE. It provides certain theoretical basis for preparation of high-performance starch-based food contact materials.