增塑聚乳酸的熱-機(jī)械性能表征-資料下載頁(yè)
2025-05-13 12:02本頁(yè)面
【正文】 scibility between PLA and plasticizers, they can offer satisfying patibility as will be assessed by tensile tests. Table 4 Melting temperature and enthalpies of pure ponents and melting temperature and enthalpies for PLA in PLA / plasticizers blends Flory–Huggins relation： 21121211 ??VHRVTT momm ????(3) Tm and T0m are the equilibrium melting points of PLA in blends and neat crystallizing polymer. The subscript ‘1’ indicates the noncrystallizing ponent (plasticizer) and ‘2’ the crystallizing PLA. V1 and V2 are the molar volume of the repeat units. ?Hm is the heat of fusion of PLA and Φ1 is the volume fraction of plasticizer Table 5 Crystallization temperatures of pure ponents and of PLA/plasticizer blends during heating at a rate of 20 ℃ min1 . Mechanical properties Table 6 Tensile modulus (MPa) of pure PLA and plasticized PLA Table 7 Strain at break (%) of pure PLA and plasticized PLA Table 8 Stress at break (MPa) of pure PLA and plasticized PLA Fig. 3. Tensile modulus vs glass transition temperature of plasticizers/PLA blends. 4. Conclusion ? Plasticizers blended with PLA lowered the glass transition temperature and modified the melting and crystallization characteristics. ? In this position range, the glass transition temperature is in good agreement with the calculated interaction parameters ? Mechanical characteristics of these materials showed a decrease in modulus and stress at break. Thank you !
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