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Research Papers

Characterization of Creeping and Shape Memory Effect in Laser Sintered Thermoplastic Polyurethane

[+] Author and Article Information
Shangqin Yuan

Singapore Centre for 3D Printing,
School of Mechanical
and Aerospace Engineering,
Nanyang Technological University,
Singapore 639798, Singapore
e-mail: YUAN0057@e.ntu.edu.sg

Jiaming Bai

Singapore Institute
of Manufacturing Technology,
Singapore 638075, Singapore
e-mail: baijm@SIMTech.edu.sg

Chee Kai Chua

Singapore Centre for 3D Printing,
School of Mechanical and Aerospace
Engineering,
Nanyang Technological University,
Singapore 639798, Singapore
e-mail: mckchua@ntu.edu.sg

Kun Zhou

Singapore Centre for 3D Printing,
School of Mechanical and Aerospace
Engineering,
Nanyang Technological University,
Singapore 639798, Singapore
e-mail: kzhou@ntu.edu.sg

Jun Wei

Singapore Institute
of Manufacturing Technology,
Singapore 638075, Singapore
e-mail: jwei@SIMTech.edu.sg

1Corresponding author.

Contributed by the Computers and Information Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received April 2, 2016; final manuscript received June 16, 2016; published online November 7, 2016. Assoc. Editor: ChiKit Au.

J. Comput. Inf. Sci. Eng 16(4), 041007 (Nov 07, 2016) (5 pages) Paper No: JCISE-16-1908; doi: 10.1115/1.4034032 History: Received April 02, 2016; Revised June 16, 2016

Thermoplastic polyurethane (TPU) powders were successfully processed in a selective laser sintering (SLS) system. The laser-sintered polyurethane products with viscoelastic behaviors exhibit high flexibility and elongation at break at room temperature. Moreover, the creeping and the thermoresponsive shape-memory effects (SME) were also characterized. The influences of the time-temperature relevant parameters on the shape-fixity and shape-recovery ratios were investigated quantitatively. The creeping and SME were time–temperature dependent phenomena, and the shape recovery mechanism is associated to the microsegments thermal transitions within the polymer matrix.

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References

Poon, B. C. , Dias, P. , Ansems, P. , Chum, S. P. , Hiltner, A. , and Baer, E. , 2007, “ Structure and Deformation of an Elastomeric Propylene–Ethylene Copolymer,” J. Appl. Polym. Sci., 104(1), pp. 489–499. [CrossRef]
Murthy, N. S. , 2006, “ Hydrogen Bonding, Mobility, and Structural Transitions in Aliphatic Polyamides,” J. Polym. Sci. Part B, 44(13), pp. 1763–1782. [CrossRef]
Liu, C. , Qin, H. , and Mather, P. T. , 2007, “ Review of Progress in Shape-Memory Polymers,” J. Mater. Chem., 17(16), pp. 1543–1558. [CrossRef]
Rivero, G. , Nguyen, L.-T. T. , Hillewaere, X. K. D. , and Du Prez, F. E. , 2014, “ One-Pot Thermo-Remendable Shape Memory Polyurethanes,” Macromolecules, 47(6), pp. 2010–2018. [CrossRef]
Lazarus, A. , and Reis, P. M. , 2015, “ Soft Actuation of Structured Cylinders Through Auxetic Behavior,” Adv. Eng. Mater., 17(6), pp. 815–820. [CrossRef]
Babaee, S. , Shim, J. , Weaver, J. C. , Chen, E. R. , Patel, N. , and Bertoldi, K. , 2013, “ 3D Soft Metamaterials With Negative Poisson's Ratio,” Adv. Mater., 25(36), pp. 5044–5049. [CrossRef] [PubMed]
Meng, H. , and Li, G. , 2013, “ A Review of Stimuli-Responsive Shape Memory Polymer Composites,” Polymer, 54(9), pp. 2199–2221. [CrossRef]
Goodridge, R. D. , Tuck, C. J. , and Hague, R. J. M. , 2012, “ Laser Sintering of Polyamides and Other Polymers,” Prog. Mater. Sci., 57(2), pp. 229–267. [CrossRef]
Chua, C. K. , Leong, K. F. , Tan, K. H. , Wiria, F. E. , and Cheah, C. M. , 2004, “ Development of Tissue Scaffolds Using Selective Laser Sintering of Polyvinyl Alcohol/Hydroxyapatite Biocomposite for Craniofacial and Joint Defects,” J. Mater. Sci.: Mater. Med., 15(10), pp. 1113–1121. [CrossRef] [PubMed]
Bai, J. , Goodridge, R. , Yuan, S. , Zhou, K. , Chua, C. , and Wei, J. , 2015, “ Thermal Influence of CNT on the Polyamide 12 Nanocomposite for Selective Laser Sintering,” Molecules, 20(10), p. 19041. [CrossRef] [PubMed]
Bai, J. , Goodridge, R. D. , Hague, R. J. M. , Song, M. , and Okamoto, M. , 2014, “ Influence of Carbon Nanotubes on the Rheology and Dynamic Mechanical Properties of Polyamide-12 for Laser Sintering,” Polym. Test., 36, pp. 95–100. [CrossRef]
Cazón, A. , Prada, J. G. , García, E. , Larraona, G. S. , and Ausejo, S. , 2015, “ Pilot Study Describing the Design Process of an Oil Sump for a Competition Vehicle by Combining Additive Manufacturing and Carbon Fibre Layers,” Virtual Phys. Prototyping, 10(3), pp. 149–162. [CrossRef]
Vaezi, M. , and Yang, S. , 2015, “ Extrusion-Based Additive Manufacturing of PEEK for Biomedical Applications,” Virtual Phys. Prototyping, 10(3), pp. 123–135. [CrossRef]
Khoo, Z. X. , Teoh, J. E. M. , Liu, Y. , Chua, C. K. , Yang, S. , An, J. , Leong, K. F. , and Yeong, W. Y. , 2015, “ 3D Printing of Smart Materials: A Review on Recent Progresses in 4D Printing,” Virtual Phys. Prototyping, 10(3), pp. 103–122. [CrossRef]
Chua, C. K. , and Leong, K. F. , 2014, 3D Printing and Additive Manufacturing: Principles and Applications, World Scientific Publishing Company Pte Limited, Singapore.
Boparai, K. , Singh, R. , and Singh, H. , 2015, “ Comparison of Tribological Behaviour for Nylon6-Al-Al2O3 and ABS Parts Fabricated by Fused Deposition Modelling,” Virtual Phys. Prototyping, 10(2), pp. 59–66. [CrossRef]
Plummer, K. , Vasquez, M. , Majewski, C. , and Hopkinson, N. , 2012, “ Study Into the Recyclability of a Thermoplastic Polyurethane Powder for Use in Laser Sintering,” Proc. Inst. Mech. Eng., Part B., 226(7), pp. 1127–1135. [CrossRef]
Bai, J. , Yuan, S. , Chow, W. , Chua, C. K. , Zhou, K. , and Wei, J. , 2015. “ Effect of Surface Orientation on the Tribological Properties of Laser Sintered Polyamide 12,” Polym. Test., 48, pp. 111–114. [CrossRef]
Yap, Y. L. , and Yeong, W. Y. , 2015, “ Shape Recovery Effect of 3D Printed Polymeric Honeycomb,” Virtual Phys. Prototyping, 10(2), pp. 91–99. [CrossRef]
Gurrala, P. K. , and Regalla, S. P. , 2014, “ Multi-Objective Optimisation of Strength and Volumetric Shrinkage of FDM Parts,” Virtual Phys. Prototyping, 9(2), pp. 127–138. [CrossRef]
Wu, X. L. , Huang, W. M. , and Tan, H. X. , 2013, “ Characterization of Shape Recovery Via Creeping and Shape Memory Effect in Ether-Vinyl Acetate Copolymer (EVA),” J. Polym. Res., 20, pp. 1–11.

Figures

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Fig. 1

DSC diagram of TPU powders from −50 °C to 200 °C at the rate of cooling and heating at 10 °C/min

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Fig. 2

Specimen dimensions (in mm; thickness is 2 mm) in the ASTM D638 standard, type IV

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Fig. 3

Illustration of a typical SME cycle for TPU [21]

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Fig. 4

Powder shape and surface morphology of TPU powders (DESMOSINT X92) by field-emission scanning electron microscopy (FESEM)

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Fig. 5

(a) The powder bed of SLS process at 96 °C and (b) the sintered specimen (Tensile bar in ASTM D638)

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Fig. 6

Strain versus stress curves of sintered TPU specimens upon stretching to different maximum strains of 100%, 200%, and 300%, at the room temperature of 25 °C

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Fig. 7

Typical strain versus stress curves obtained at three different temperatures of 25 °C, 60 °C, and 95 °C, upon stretching to a maximum programming strain of 100%

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Fig. 8

Evaluation of the instant shape fixity ratio (Rfi, black line) and the long-term shape fixity ratio (Rfl, blue line) upon stretching for 0, 30, and 60 min at the maximum programming strains of 200% and 300%, at the room temperature

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Fig. 9

Shape-recovery ratio (Rr) of specimens prestretched to the maximum programming strains of 200% and 300% for 0 and 30 min, under different recovery temperatures of 35 °C, 60 °C, and 95 °C

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Fig. 10

Strain versus stress curves of the sintered TPU over four cycles of stretching–creeping–thermal stimulation (a) upon stretching to 200% strain for 0 min and (b) upon stretching to 200% strain for 30 min, and (c) final fixity ratios of the sintered TPU over four cycles with respect to different holding durations

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