In this article, Glycidyl methacrylate (GMA) was grafted on poly(butylene succinate) (PBS) by virtue of reactive blending in the extrusion process and thermoplastic starch (TPS) was prepared via a melt...
Single-crystal-to-single-crystal
(SCSC) polymerization
offers an
effective protocol for the environmentally friendly preparation of
polymer single crystals (PSCs) with extremely high crystallinity and
very large molecular weights. Single-crystal X-ray diffraction (SCXRD)
serves as a powerful technique for the in-depth characterization of
their structures at a molecular level. Hence, a fundamental understanding
of the structure–property relationships of PSCs is within our
reach. Most of the reported PSCs, however, suffer from poor solubility,
a property which hampers their post-functionalization and solution
processability when it comes to practical applications. Here, we report
soluble and processable PSCs with rigid polycationic backbones by
taking advantage of an ultraviolet-induced topochemical polymerization
from an elaborately designed monomer that results in a multitude of
photoinduced [2 + 2] cycloadditions. The high crystallinity and excellent
solubility of the resulting polymeric crystals enable their characterization
both in the solid state by X-ray crystallography and electron microscopy
and in the solution phase by NMR spectroscopy. The topochemical polymerization
follows first-order reaction kinetics to a first approximation. Post-functionalization
of the PSCs by anion exchange renders them super-hydrophobic materials
for water purification. Solution processability endows PSCs with excellent
gel-like rheological properties. This research represents a major
step towards the controlled synthesis and full characterization of
soluble single-crystalline polymers, which may find application in
the fabrication of PSCs with many different functions.
In this article, isosorbide divalerate (SDV), an alternative renewable resource plasticizer for degradable poly(butylene succinate) (PBS) was successfully synthesized with isosorbide and valeric acid, and was characterized by Fourier transform infrared (FTIR). The mechanical properties, glass transition temperature (T
g
), crystallization properties, rheological behavior of PBS/SDV blends was studied in detail. The results showed that incorporation of SDV had successfully reduced T
g
of the PBS composites, particularly at 20 wt% SDV, where the value of T
g
exhibited a reduction of 12 °C or 39% compared to pure PBS, demonstrating SDV possessed plasticizing efficacy. The crystallinity of PBS was declined by presence of SDV in the blends, and the incorporation of 20 wt% SDV into PBS matrix promoted an impressive decrease of exceeding 22%. Significant enhancement of the toughness and flexibility of PBS was achieved by the addition of SDV. The rheological test revealed that the decrease of modulus and viscosity improved the processing properties of the materials, which broadened the PBS applications. Altogether the SEM showed the fracture surface of the composites undergoes a brittle-tough transition with increasing SDV content below 12% content, meanwhile, significant phase separation was observed in the composites with high content of SDV.
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