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<p>Three-dimensional (3D) printing using polypropylene (PP) holds significant promise across various industrial domains due to its favorable mechanical attributes and cost-effectiveness. However, the inherent crystallization nature of PP presents significant challenges during the printing process, leading to warping and dimensional inconsistencies in printed objects. This study investigates methods to effectively manage PP crystallization under simulated ambient conditions to mitigate warping and enhance print quality in 3D printing applications. Our primary hypothesis was to target the crystallization behavior of isotactic polypropylene, and thus the crystallization kinetics of pristine PP were manipulated using experimental techniques that involved controlled cooling rates and variations in ambient temperature. The crystalline structure and thermal properties of printed PP specimens were analyzed using techniques such as differential scanning calorimetry (DSC), X-ray diffraction (XRD), and polarized light microscopy (PLM). Additionally, mechanical characteristics and dimensional stability of printed parts were evaluated through tensile testing and dimensional accuracy analysis. The results demonstrate that precise regulation of ambient conditions during the printing process significantly influences the crystallization behavior of PP, leading to improved print quality (Tensile strength = 28.6&#xa0;MPa, Young’s modulus = 699&#xa0;MPa) and dimensional stability (Shrinkage &lt; 0.5%). By adjusting the cooling rate and ambient temperature, warping tendencies were effectively managed, resulting in 3D-printed PP components free from warping and exhibiting enhanced mechanical properties.</p>

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Influence of simulated ambience on melt crystallization of isotactic polypropylene towards developing warp-free 3D printing

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Rahul Chatterjee,
  • Jagannath Chanda,
  • Sayan Basak,
  • Tuhin Dolui,
  • H. Sushmitha,
  • Prasenjit Ghosh,
  • Rabindra Mukhopadhyay,
  • Abhijit Bandyopadhyay

摘要

Three-dimensional (3D) printing using polypropylene (PP) holds significant promise across various industrial domains due to its favorable mechanical attributes and cost-effectiveness. However, the inherent crystallization nature of PP presents significant challenges during the printing process, leading to warping and dimensional inconsistencies in printed objects. This study investigates methods to effectively manage PP crystallization under simulated ambient conditions to mitigate warping and enhance print quality in 3D printing applications. Our primary hypothesis was to target the crystallization behavior of isotactic polypropylene, and thus the crystallization kinetics of pristine PP were manipulated using experimental techniques that involved controlled cooling rates and variations in ambient temperature. The crystalline structure and thermal properties of printed PP specimens were analyzed using techniques such as differential scanning calorimetry (DSC), X-ray diffraction (XRD), and polarized light microscopy (PLM). Additionally, mechanical characteristics and dimensional stability of printed parts were evaluated through tensile testing and dimensional accuracy analysis. The results demonstrate that precise regulation of ambient conditions during the printing process significantly influences the crystallization behavior of PP, leading to improved print quality (Tensile strength = 28.6 MPa, Young’s modulus = 699 MPa) and dimensional stability (Shrinkage < 0.5%). By adjusting the cooling rate and ambient temperature, warping tendencies were effectively managed, resulting in 3D-printed PP components free from warping and exhibiting enhanced mechanical properties.