Physical Characteristics of Sweet Potato Pulp/Polycaprolactone Blends

Eun Jung Lee, Dong Keon Kweon, Bong Kyung Koh, Seung Taik Lim

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Sweet potato pulp (SSP) obtained as a by-product from starch extraction was blended with polycaprolactone (PCL) to prepare a biodegradable plastic material. In the blends, PCL was used as a reinforcing agent. The SPP/PCL blends were prepared by compression-molding under high temperature and pressure, at different SPP/PCL ratios, and the mechanical properties of the molded specimens were tested. Matrix structure and thermal properties were measured by using a Fourier transform infrared (FTIR) spectrophotometer, scanning electron microscope (SEM), differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA). Mechanical properties (tensile and flexural properties) were also measured to find the most suitable ratio in a SSP/PCL blend. During compression molding of the SPP/PCL blends under high pressure and temperature, chemical reaction occurred between SPP and PCL, and thus, thermal stability and mechanical strength of the blends increased and water uptake decreased. Also, by increasing the PCL content in the blend, the matrix in the blend became more homogeneous, and consequently, mechanical strength of the molded specimen increased. At 7/3 or 6/4 weight ratio of SSP/PCL, water uptake of the molded specimen became substantially less than that at 8/2.

Original languageEnglish
Pages (from-to)861-866
Number of pages6
JournalJournal of Applied Polymer Science
Issue number2
Publication statusPublished - 2004 Apr 15


  • Mechanical strength
  • SSP/PCL blend
  • Sweet potato pulp
  • Thermal characteristics
  • Water uptake

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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