The purposes of this work are to diagnose the processing feasibility of randomly aligned silk fibroin fiber-reinforced biodegradable polymer matrix biocomposites by extrusion and injection molding and also to further improve the properties by electron beam irradiation technique. For better understan...
The purposes of this work are to diagnose the processing feasibility of randomly aligned silk fibroin fiber-reinforced biodegradable polymer matrix biocomposites by extrusion and injection molding and also to further improve the properties by electron beam irradiation technique. For better understanding the effect of electron beam on the properties of silk/PBS biocomposites, the effect of the electron beam on the PBS films was also studied.
The gel fraction of PBS films containing triallyl isocyanurate (TAIC) of 4 wt% increased with E-beam irradiation and reached more than 90% at 50 kGy. The highest Tg was found at 50 kGy. The Tm showed a decreasing tendency with increasing electron beam absorption dose. The storage modulus was highest at above 50 kGy. The tensile modulus was also highest at above 50 kGy and the tensile strength showed the highest value at 50~100 kGy. The result indicated that the PBS resin was cross-linked by the assistance of a multi-functional monomer TAIC by electron beam irradiation. The result also showed that the crosslinked PBS film exhibited the increased thermal and mechanical properties at 50 kGy.
Randomly aligned silk fibroin/PBS biocomposites with various silk fibroin fiber contents (0, 10, 20, 25, 30, and 40 wt%) were successfully processed using extrusion and injection technique. The coefficient of thermal expansion of silk fibroin/PBS biocomposites was decreased with increasing silk fibroin fiber contents. The storage modulus, tensile modulus, flexural modulus and flexural strength of silk fibroin/PBS biocomposites were increased with increasing silk fibroin fiber contents, whereas the tensile strength and impact strength were decreased. It was noted that the silk fibroin fiber contents of 30 wt% were optimal in the present biocomposite system.
EB-silk fibroin/PBS biocomposites with various electron beam (EB) absorption doses (0, 10, 30, 50, 70, 100, and 150 kGy) on silk fibroin fibers were fabricated. The silk fibroin fiber contents were fixed to 30 wt%. The thermo-dimensional stability of biocomposites was increased at 50~100 kGy. The tensile strength and impact strength were decreased at high electron beam absorption dose.
Silk fibroin/EB-PBS biocomposites irradiated with various E-beam absorption doses (0, 10, 20, 30, 50, 70, 100, and 150 kGy) were successfully fabricated. Here, the PBS matrix was directly irradiated with the electron beam. The silk fibroin fiber contents were fixed to 30 wt%. The thermal stability and thermo-dimensional stability of silk fibroin/PBS biocomposites were increased with increasing electron beam absorption dose. In particular, the CTE value was lowest at 50 kGy. The storage modulus of silk fibroin/PBS biocomposites showed the increasing tendency with increasing E-beam absorption dose. The maximum peak of tan δ showed an increasing tendency up to 100 kGy and then decreased. The tensile, flexural and impact properties of silk fibroin/PBS biocomposites were decreased with increasing electron beam absorption, reflecting the increased stiffness of the biocomposites with increasing electron beam absorption dose. As a result, the electron beam absorption dose of 50~100 kGy may be appropriate for improving the thermal and mechanical properties of silk fibroin/PBS biocomposites processed by extrusion/injection molding technique.
The purposes of this work are to diagnose the processing feasibility of randomly aligned silk fibroin fiber-reinforced biodegradable polymer matrix biocomposites by extrusion and injection molding and also to further improve the properties by electron beam irradiation technique. For better understanding the effect of electron beam on the properties of silk/PBS biocomposites, the effect of the electron beam on the PBS films was also studied.
The gel fraction of PBS films containing triallyl isocyanurate (TAIC) of 4 wt% increased with E-beam irradiation and reached more than 90% at 50 kGy. The highest Tg was found at 50 kGy. The Tm showed a decreasing tendency with increasing electron beam absorption dose. The storage modulus was highest at above 50 kGy. The tensile modulus was also highest at above 50 kGy and the tensile strength showed the highest value at 50~100 kGy. The result indicated that the PBS resin was cross-linked by the assistance of a multi-functional monomer TAIC by electron beam irradiation. The result also showed that the crosslinked PBS film exhibited the increased thermal and mechanical properties at 50 kGy.
Randomly aligned silk fibroin/PBS biocomposites with various silk fibroin fiber contents (0, 10, 20, 25, 30, and 40 wt%) were successfully processed using extrusion and injection technique. The coefficient of thermal expansion of silk fibroin/PBS biocomposites was decreased with increasing silk fibroin fiber contents. The storage modulus, tensile modulus, flexural modulus and flexural strength of silk fibroin/PBS biocomposites were increased with increasing silk fibroin fiber contents, whereas the tensile strength and impact strength were decreased. It was noted that the silk fibroin fiber contents of 30 wt% were optimal in the present biocomposite system.
EB-silk fibroin/PBS biocomposites with various electron beam (EB) absorption doses (0, 10, 30, 50, 70, 100, and 150 kGy) on silk fibroin fibers were fabricated. The silk fibroin fiber contents were fixed to 30 wt%. The thermo-dimensional stability of biocomposites was increased at 50~100 kGy. The tensile strength and impact strength were decreased at high electron beam absorption dose.
Silk fibroin/EB-PBS biocomposites irradiated with various E-beam absorption doses (0, 10, 20, 30, 50, 70, 100, and 150 kGy) were successfully fabricated. Here, the PBS matrix was directly irradiated with the electron beam. The silk fibroin fiber contents were fixed to 30 wt%. The thermal stability and thermo-dimensional stability of silk fibroin/PBS biocomposites were increased with increasing electron beam absorption dose. In particular, the CTE value was lowest at 50 kGy. The storage modulus of silk fibroin/PBS biocomposites showed the increasing tendency with increasing E-beam absorption dose. The maximum peak of tan δ showed an increasing tendency up to 100 kGy and then decreased. The tensile, flexural and impact properties of silk fibroin/PBS biocomposites were decreased with increasing electron beam absorption, reflecting the increased stiffness of the biocomposites with increasing electron beam absorption dose. As a result, the electron beam absorption dose of 50~100 kGy may be appropriate for improving the thermal and mechanical properties of silk fibroin/PBS biocomposites processed by extrusion/injection molding technique.
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