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KMID : 1007520030120050548
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Food Science and Biotechnology
2003 Volume.12 No. 5 p.548 ~ p.553
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Degradability of Multi-Degradable HDPE and LDPE Food Packaging Films
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Chung, Myong-Soo
Lee, Wang-Hyun/You, Young-Sun/Kim, Hye-Young/Park, Ki-Moon
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Abstract
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Degradable plastic additives (MCC-101, MCC-102) were prepared, and pure low-density polyethylene (LDPE), high-density polyethylence (HDPE) food packaging films, and multi-degradable films containing HDPE and LDPE resins and MCC series master batches (M／B) were manufactured by inflation film processing. The amount of M／Bs added in multi-degradable films was 40％, and the thickness wass about 50㎛. The films were exposed to UV radiation, fungi, and heat in order to observe their photolysis, biodegradability, and thermal degradability, respectively. While pure PE films maintained more than 90% of their original elongation after 40 days of UV radiation, an almost perfect loss in the elongation of PE films containing 40% M/B was observed. Significant decreases in the elongation of PE films by heat treatment (68±2℃) were also observed for samples containing the multi-degradable M/B. By observing changes in film surface after the inoculation of fungi with scanning electron microscopy (SEM), the accelerated biodegradability of plastic films by adding multi-degradable M/B was confirmed. Overall results showed that the addition of multi-degradable M/B has a strong potential to effectively degrade plastic films in natural conditions.
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