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Biodegradable Corn Starch Loose-Fill. II. The Effect of Storage at Different Relative Humidities on the Physical Properties of Loose-Fill

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Abstract

The physical properties of corn starch loose-fill were examined at various relative humidities (r.h.). After 48 h of storage at both 25 and 50% r.h., only a slight change in the dimension and physical properties of the corn starch loose-fill was apparent. A wet environment (75% r.h. for 48 h), however, caused significant shrinkage and the loss of physical properties. The tensile properties, particularly tensile modulus, sharply increased, while the resilience gradually decreased with storage time. Amorphous X-ray diffraction patterns of corn starch loose-fills were transformed into crystalline patterns due to aging at 75% r.h. after 48 h. These changes were attributed to the structural relaxation, which was accelerated by moisture gain. The T g of corn starch loose-fill decreased with increasing the moisture content in expanded starch. Our proposed model based on Avrami equation was able to describe the time-dependent recrystallization of corn starch by modifying the time-dependent tensile modulus. The growth parameter (n) and time constant (k) for the recrystallization process of corn starch loose-fill were about 3.2 and 8.87 × 10−18 s−1, respectively. If the growth parameter of 3.2 is considered, spherulitic growth of crystallization occurred in the corn starch loose-fill in the wet environment.

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Authors and Affiliations

  1. Department of Textile Engineering, College of Engineering, Hanyang University, [17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea

    Dae-lyoung Lim & Seung-soon Im

  2. Department of Textile, Bucheon Technical College, 424, Simgog-dong, Wonmi-gu, Bucheon, Kyoungkido, 421-010, Korea

    Young-mok Lee

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  1. Dae-lyoung Lim
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  2. Seung-soon Im
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  3. Young-mok Lee
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Lim, Dl., Im, Ss. & Lee, Ym. Biodegradable Corn Starch Loose-Fill. II. The Effect of Storage at Different Relative Humidities on the Physical Properties of Loose-Fill. Journal of Polymers and the Environment 6, 1–7 (1998). https://doi.org/10.1023/A:1022801810926

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  • DOI: https://doi.org/10.1023/A:1022801810926

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