A Comparative Study on the Effectiveness of Silane Coupling Agent and Epoxidized Natural Rubber as Compatibilizers in Polybutylene Succinate/Rice Flour Biocomposites

Apaipan Rattanapan; Thritima Sritapunya; Surakit Tuampoemsab; Pornsri Sapsrithong

doi:10.4028/p-TBrQf3

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HomeMaterials Science ForumMaterials Science Forum Vol. 1194A Comparative Study on the Effectiveness of Silane...

A Comparative Study on the Effectiveness of Silane Coupling Agent and Epoxidized Natural Rubber as Compatibilizers in Polybutylene Succinate/Rice Flour Biocomposites

Abstract:

Polybutylene succinate (PBS) and rice flour (RF) biocomposites containing 10 and 20 parts per hundred resin (phr) of RF were successfully fabricated. The effects of epoxidized natural rubber (ENR-50) at loadings of 0, 1, 5, and 10 phr on the interfacial compatibility and mechanical performance of PBS/20 phr RF composites were examined. The compatibilizing effectiveness of 3-aminopropyl-triethoxysilane and ENR-50 was also evaluated comparatively. The composites were first blended using a two-roll mill to achieve homogeneous mixing and then molded into test specimens through an injection molding technique. The phase morphology, along with mechanical characteristics such as tensile and flexural properties, impact resistance, and Shore D hardness, was thoroughly evaluated. Incorporating 1 phr ENR-50 resulted in notable improvements in phase compatibility and mechanical properties, with scanning electron microscopy (SEM) revealing reduced surface roughness and enhanced matrix–filler interfacial adhesion. Improvements in impact strength, hardness and modulus values were also observed at this loading. Further increases in ENR-50 content adversely affected flexural strength, flexural modulus, Young’s modulus, and hardness. Comparative analyses showed that the combined use of a silane coupling agent and ENR-50 yielded a more homogeneous phase morphology with superior mechanical properties compared to the addition of either agent alone. These findings demonstrated the synergistic effect of using both compatibilizer types to enhance the performance of PBS/RF biocomposites.