Role of specific interfacial area in controlling properties of immiscible blends of biodegradable polylactide and poly[(butylene succinate)-co-adipate]

Vincent Ojijo, Suprakas Sinha Ray, Rotimi Sadiku

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)

Abstract

Binary blends of two biodegradable polymers: polylactide (PLA), which has high modulus and strength but is brittle, and poly[(butylene succinate)-co-adipate] (PBSA), which is flexible and tough, were prepared through batch melt mixing. The PLA/PBSA compositions were 100/0, 90/10, 70/30, 60/40, 50/50, 40/60, 30/70, 10/90, and 0/100. Fourier-transform infrared measurements revealed the absence of any chemical interaction between the two polymers, resulting in a phase-separated morphology as shown by scanning electron microscopy (SEM). SEM micrographs showed that PLA-rich blends had smaller droplet sizes when compared to the PBSA-rich blends, which got smaller with the reduction in PBSA content due to the differences in their melt viscosities. The interfacial area of PBSA droplets per unit volume of the blend reached a maximum in the 70PLA/30PBSA blend. Thermal stability and mechanical properties were not only affected by the composition of the blend, but also by the interfacial area between the two polymers. Through differential scanning calorimetry, it was shown that molten PBSA enhanced crystallization of PLA while the stiff PLA hindered cold crystallization of PBSA. Optimal synergies of properties between the two polymers were found in the 70PLA/30PBSA blend because of the maximum specific interfacial area of the PBSA droplets.

Original languageEnglish
Pages (from-to)6690-6701
Number of pages12
JournalACS applied materials & interfaces
Volume4
Issue number12
DOIs
Publication statusPublished - 26 Dec 2012

Keywords

  • interfacial area
  • phase morphology
  • polylactide/poly[(butylene succinate)-co-adipate] blends
  • thermal and mechanical properties

ASJC Scopus subject areas

  • General Materials Science

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