Poly(lactic acid) (PLA)/palygorskite (Paly) nanocomposites were prepared using the melt compounding technique. Paly modified by 3-aminopropyltriethoxysilane (APTES) and vinyltrimethoxysilane (VTMS) was used as nanofiller for PLA with concentrations in the 1–7 wt% range. It has been found that the functionalization allows a covalent bond between the hydroxyl groups of the Paly and the PLA matrix, evidenced by the improvement in mechanical properties. Paly modification with VTMS has better properties compared with Pale modification with APTES. This indicates a better adhesion between the Paly-VTMS and PLA matrix, and a good dispersion of the nanofiller in the polymer matrix.

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A new band situated in the vicinity of 1056 cm-1 has been observed in the IR spectrum of UHMW PE. This band appears during compaction of the reactor powder, pressing of pellets, and drawing of the result ing films at room temperature. The intensity of the band increases with the time of staying under pressure in proportion to logt with a simultaneous reduction in the intensity of absorption bands corresponding to the orthorhombic phase of PE. Upon staying of the samples at room temperature, the intensity of this band decreases for a long time with a concomitant increase in the intensity of the bands due to the orthorhombic phase of PE. An increase in temperature accelerates this process, and annealing at 100°C for 30 min brings about disappearance of the 1056 cm-1 band and cessation of an increase in the intensity of absorption bands corresponding to the orthorhombic phase of PE. On the basis of the above data, it is inferred that the band at 1056 cm-1 may be attributed to the monoclinic phase of PE.