Mechanical properties and biodegradation of Poly(butylene succinate)/silkworm cocoon composites
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Abstract
In this study, poly(butylene succinate)/silkworm cocoon composites were prepared in the following ratios: 100/0, 90/10, 80/20, 70/30, and 60/40. The mechanical properties (tensile, impact, and hardness tests), biodegradation properties, and morphological characteristics of the composites were examined. The results demonstrated that the Young's modulus, impact strength, and hardness of the composites increased with an increase in the amount of silkworm cocoon, while the tensile strength and elongation at break of the composites decreased. An assessment of the decomposition of poly(butylene succinate)/silkworm cocoon composites buried in soil for 4, 8, and 10 weeks showed that increasing the amount of silkworm cocoons in the composites resulted in increased biodegradation. Moreover, the morphology of the specimen after impact testing was examined using the SEM technique. The SEM images showed that the silkworm cocoon fibers were distributed in the polymer matrix, indicating the incompatibility of the silk and poly(butylene succinate) matrix. This incompatibility resulted in composite materials with decreased tensile strength and elongation at break.
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