Biodegradable polymer blends of poly(L-lactic acid) and gelatinized starch

Jun Wuk Park, Seung Soon Im, Soo Hyun Kim, Young Ha Kim

Research output: Contribution to journalArticle

179 Citations (Scopus)

Abstract

Gelatinized starches were prepared with various content of glycerol and were investigated in terms of the effect of the glycerol addition on characteristics of starch and its blends. Poly (L-lactic acid) (PLA) with various ratios of linear/star shaped PLA and starch gelatinized with various ratios of water/glycerol were melt-blended by using twin screw mixer. The blends were characterized by DSC thermal analysis, tensile test and morphological analysis. Gelatinization of starch was found to lead to destruction or diminution of hydrogen bonding in granules and a decrease of crystallinity of starch. DSC data showed that starch played a role as a nucleating agent and glycerol as plasticizer contributed to an improvement in crystallinity in PLA blends. When the content of starch increased, the size of spherulites in PLA blends was smaller and less regular. In the case of PLA/pure starch blends, the voids appeared, which were formed by the separation of starch particles from the matrix. But for PLA/gelainized starch blends, these voids were not observed. In the case of blends with linear PLA and starch gelatinized with water/glycerol ratio of 100/40, the greatest superiority of mechanical properties was shown and the toughness was improved compared with PLA/pure starch blends.

Original languageEnglish
Pages (from-to)2539-2550
Number of pages12
JournalPolymer Engineering and Science
Volume40
Issue number12
DOIs
Publication statusPublished - 2000 Dec 1
Externally publishedYes

Fingerprint

Biodegradable polymers
Polymer blends
Lactic acid
Starch
Glycerol
poly(lactic acid)
Plasticizers
Water
Thermoanalysis
Toughness
Stars
Hydrogen bonds

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Biodegradable polymer blends of poly(L-lactic acid) and gelatinized starch. / Park, Jun Wuk; Im, Seung Soon; Kim, Soo Hyun; Kim, Young Ha.

In: Polymer Engineering and Science, Vol. 40, No. 12, 01.12.2000, p. 2539-2550.

Research output: Contribution to journalArticle

Park, Jun Wuk ; Im, Seung Soon ; Kim, Soo Hyun ; Kim, Young Ha. / Biodegradable polymer blends of poly(L-lactic acid) and gelatinized starch. In: Polymer Engineering and Science. 2000 ; Vol. 40, No. 12. pp. 2539-2550.
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