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<p>Polylactic acid (PLA) is a material often used in 3D printing. However, its low-temperature thermal properties are not well known. In this paper, we present results of measurements of the thermal contraction of two samples of PLA made by different manufacturers. We constructed a capacitance dilatometer and used it to measure the length variations of PLA continuously from room temperature to 4K. We found that in both cases, the sample’s length changed by approximately 1–1.2%, with behavior that appears to depend on additives in the PLA. Additionally, we computed the linear thermal expansion coefficient for both samples over the same temperature range and found behavior indicating several possible glass transitions.</p>

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Low-Temperature Thermal Expansion of Polylactic Acid

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • J. Vian-Reagan,
  • D. N. Eiteneer,
  • M. W. Ray

摘要

Polylactic acid (PLA) is a material often used in 3D printing. However, its low-temperature thermal properties are not well known. In this paper, we present results of measurements of the thermal contraction of two samples of PLA made by different manufacturers. We constructed a capacitance dilatometer and used it to measure the length variations of PLA continuously from room temperature to 4K. We found that in both cases, the sample’s length changed by approximately 1–1.2%, with behavior that appears to depend on additives in the PLA. Additionally, we computed the linear thermal expansion coefficient for both samples over the same temperature range and found behavior indicating several possible glass transitions.