In contrast to most studies in the literature where soy protein was used as a particulate filler in hydrophobic thermoplastic polymers, in this study, soy protein concentrate (SPC) was processed as a plastic to blend with poly(butylene adipate-co-terephthalate) (PBAT). By adjusting water content in the formulated SPC from low to high prior to compounding, SPC exhibited behaviors ranging from rigid filler to deformable filler to plastic during blending. Detailed phase morphology of the blends was revealed by transmission electron microscopy and field emission scanning electron microscopy. Evidences showed that SPC formed percolated thread structures when additional water was added to SPC prior to compounding. Study of dynamic rheology also confirmed the formation of interconnected network structure. Accordingly, tensile mechanical properties were greatly improved for those blends with percolated SPC thread structures. The molecular weight change of PBAT in blends and influence of processing on soy protein solubility were also examined. 相似文献
When containing extra water, soy protein concentrate (SPC) can behave like a plastic melt rather than particulate filler in blending process. In this study, blends of formulated SPC and poly(lactic acid) (PLA) were prepared. The effects of glycerol and water added to SPC on phase morphology, rheological, thermal, thermal‐dynamic, and mechanical properties of the blends were investigated. The results demonstrated that water was more effective in gelating SPC and transforming it into a plastic than glycerol. With extra water added, SPC in the resulting blend existed as stretched threads with certain degree of interconnectivity between the threads. In contrast, with only glycerol added, SPC existed as large SPC agglomerates. Consequently, the blends made from extra water‐containing SPC exhibited higher mechanical, thermal‐dynamic, and rheological properties.
Blends of polyamide 6 with metallocene rubber as dispersed phase and grafted rubber as compatibilizer
were prepared by two methods of compounding, extruder and internal mixer. Rheological measurements and
morphological analysis were made in order to study the influence of compounding. The ternary blends with
the same maleic anhydride content displayed similar rheological behaviour. On the other hand, the developed
morphology is related to the compounding process and blend formulation. The better particle size distribution
is achieved in both methods of compounding for blends with 20 wt% of EPDM-g-MA. The addition of EPDM-g-MA
improves the mechanical properties compared to blends without compatibilizer. The results confirm that
the mechanical properties are more influenced by the compounding process than by the blend composition. 相似文献
Morphological, melt rheological and dynamic mechanical properties of low-density polyethylene (LDPE)/ethylene–octene copolymer
(POE)/organo-montmorillonite (OMMT) nanocomposites, prepared via melt compounding were studied. The XRD traces indicated different
levels of intercalated structures for the nanocomposites. Addition of a compatibilizer (PE-g-MA) improved the intercalation
process. TEM results revealed existence of clay layers in both phases but they were mainly localized in the elastomeric POE
phase. Addition of 5 wt% OMMT to the LDPE/POE blend led to reduction in the size of the elastomer particles confirmed by AFM.
The complex viscosity and storage modulus showed little effect of the presence of the clay when no compatibilizer was added.
As the extent of exfoliation increased with addition of compatibilizer, the linear viscoelastic behavior of the composites
gradually changed specially at low-frequency regions. The interfacially compatibilized nanocomposites with 5 wt% OMMT had
the highest melt viscosity and modulus among all the studied nanocomposites and blends. Also, this particular composition
showed the best improvement in dynamic storage modulus. The results indicated that clay dispersion and interfacial adhesion,
and consequently different properties of LDPE/POE/clay nanocomposites, are greatly affected by addition of compatibilizer. 相似文献
The effects of transesterification on the miscibility of polycarbonate (PC)/poly(butylenes adipate-co-terephthalate) (PBAT) blends were investigated. The PC/PBAT blends were prepared with a twin-screw extruder, and then annealed
at 260 °C for 5 h to trigger the transesterification reaction. 1H NMR, FT-IR, and WAXD results indicated that transesterification in the annealed PC/PBAT blends took place and led to the
formation of a random copolymer structure. Because the copolymer serves as a compatibilizer, the PC/PBAT blends showed improved
miscibility, as confirmed by FE-SEM and DMA analyses. The compatible morphology achieved through transesterification ultimately
increased the thermal stability of the PC/PBAT blends. We could thus conclude that transesterification in PC/PBAT blends forms
a random copolymer which plays an important role as a compatibilizer and consequently improves the miscibility as well as
the thermal properties of the blends. 相似文献
The objective of this research was to investigate the effect of incorporation of maleic anhydride grafted acrylonitrile-butadiene-styrene (ABS-g-MAH) on rheological properties of PA6/ABS blends. Flow properties of the blends were examined by dynamic and capillary rheometers. The dynamic rheological analyses showed an increase in complex viscosity with the incorporation of a compatibilizer. The reduction of tan δ peaks showed enhanced interfacial interaction between PA6 and ABS phase, which resulted in the enhancement of melt strength. The power law index analysis showed that 1.5 wt.% resulted in minimum n and maximum K value for the blends while still retaining the pseudoplastics behavior necessary for plastics processing and prediction for the end use performance of the PA6/ABS blends. 相似文献