THE EFFECTS of PLASTICIZERS ON CRYSTALLINITY PERMEABILITY Sri Lanka

  • THE EFFECTS of PLASTICIZERS ON CRYSTALLINITY PERMEABILITY Sri Lanka
  • THE EFFECTS of PLASTICIZERS ON CRYSTALLINITY PERMEABILITY Sri Lanka
  • THE EFFECTS of PLASTICIZERS ON CRYSTALLINITY PERMEABILITY Sri Lanka
  • Does plasticizer affect the crystallization rate of PLA?
  • A content of 10 wt.% in TOTM has been chosen for this study, both without and with MCM-41 silica, based on the results attained in our previous investigation and in order to reach a good compromise between the amount of plasticizer and the effect on the crystallization rate of PLA (and on the actual crystallization window).
  • Does plasticizer content affect crystallinity?
  • It can be observed that the two samples containing the TOTM plasticizer show significantly higher values of 1/t 0.5max in relation to those for the PLA or PLAM5 specimens, as happened with the crystallinity in Fig. 5 b, but they are considerably lower than those shown by the specimens with ATBC, at a given plasticizer content.
  • What is the maximum rate of PLA crystallization?
  • The maximum rate in the PLA crystallization is observed at about 95–105 °C in the measurements from the melt, showing this rate a remarkable increase with the combined effect of plasticizer and MCM-41 particles. The influence is more relevant in the system with ATBC.
  • How do Plasticizers improve ductility and processability of polymers?
  • They are constituted by ordered hollow channels, whose diameters range from around 7 to 10 nm . Addition of plasticizers contributes to improve ductility and processability of polymers through the reduction of intra and intermolecular interactions within their macrochains. Accordingly, flexibility is significantly enhanced.
  • Do plasticizers and nucleating agents affect the final behavior of PLA?
  • All of the nucleating agents or the plasticizers do not have, however, an analogous impact in the final behavior of PLA. As just commented, the function of the former is to change the rate of PLA nucleation by creating a growing number of primary sites that allow a reduction in the induction period of this nucleation stage.
  • What are the characteristics of cold PLA crystallization process (tccf1)?
  • Similarly to the Tg characteristics, the cold PLA crystallization process (TccF1) is strongly dependent on the presence of plasticizer (ATBC or TOTM), of MCM-41 or of the joint action of both, plasticizer and mesoporous silica. All of the materials containing plasticizer, either ATBC or TOTM, crystallize more rapidly than the neat PLA.

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