Poly (butylene terephthalate) (PBT) is a popular thermoplastic polyester resin but has low strength and low melting point. To improve its properties, PBT is often mixed with other resins, such as high-density polyethylene (HDPE). In this study, PBT/HDPE samples with 100% PBT, 5%, 10%, 15%, and 100% HDPE are generated and tested. The samples are analyzed by tensile strength, flexural strength, impact strength, and SEM tests. Adding HDPE will reduce tensile strength compared to pure PBT, in which 5%, 10%, and 15% PBT/HDPE samples obtain the values 40.23, 38.11, and 27.77 MPa, respectively. These values are lower than that of pure PBT but still higher than that of HDPE. Improving the HDPE portion mostly results in decreasing flexural strength. The flexural strengths of these samples are 87.79, 70.47, 55.3, 58.98, and 19.14 MPa corresponding to 100% PBT, 5%, 10%, 15%, and 100% HDPE samples, respectively. Moreover, the SEM microstructure of PBT and HDPE indicates a two-phase heterogeneous mixture with little or no adhesion between these phases.

中文翻译：

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聚对苯二甲酸丁二酯/高密度聚乙烯共混物的形态和力学性能

聚对苯二甲酸丁二酯（PBT）是一种流行的热塑性聚酯树脂，但强度低且熔点低。为了提高其性能，PBT通常与其他树脂混合，例如高密度聚乙烯（HDPE）。在本研究中，生成并测试了具有100％PBT，5％，10％，15％和100％HDPE的PBT / HDPE样品。通过拉伸强度，弯曲强度，冲击强度和SEM测试分析样品。与纯PBT相比，添加HDPE会降低拉伸强度，在纯PBT中，5％，10％和15％的PBT / HDPE样品的值分别为40.23、38.11和27.77 MPa。这些值低于纯PBT，但仍高于HDPE。改善HDPE部分主要导致抗弯强度降低。这些样品的抗弯强度分别为87.79、70.47、55.3、58.98和19。14 MPa分别对应于100％PBT，5％，10％，15％和100％HDPE样品。此外，PBT和HDPE的SEM显微结构表明两相异质混合物在这些相之间几乎没有或没有粘附。