Effects of Different Biopolymers and Additives on Mechanical and Barrier Properties of Poly(3-Hydroxybutyrate-Co-3-Hydroxyvalerate) Blend Films

Yolaçan Ö., Çokkuvvetli A. T., Deniz S.

38th International Conference of Polymer Processing Society, Sankt Gallen, İsviçre, 22 - 26 Mayıs 2023, ss.472

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Sankt Gallen
  • Basıldığı Ülke: İsviçre
  • Sayfa Sayıları: ss.472
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Biopolymers are very popular today, as they contribute to the natural cycle and have a positive effect

on reducing environmental pollution. The laws on sustainability in flexible packaging are structured

to require the use of biological packaging structures that can replace fossil-based packaging.

In this study, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), commonly known as PHBV, was blended

for four ratios with both polyhydroxyalkanoate (PHA) and poly(butylene adipate-co-terephthalate)

(PBAT) by using solvent casting method. Chloroform was chosen as the suitable solvent. Four bioblends

were aimed the maximum ratio of 20 % of PHBV was incorporated into PHA and PBAT which

are amorphous structures because PHBV is brittle. The neat bio-blends were prepared such as

PHA/PHBV and PBAT/PHBV without any additives to determine PHBV behavior into PHA and PBAT.

The ratio 1 phr of PEG 400 were used as plasticizers to make good compatibilization between PHA

and PHBV, PBAT and PHBV. After the optimum main biopolymer blend ratios have been determined

according to mechanical, oxygen permeation, and optical test results, hydroxypropyl methyl cellulose

(HMPC) was added at 3 phr as reinforcing agent into PHA/PHBV and PBAT/PHBV main biopolymer

blends. Two different biopolymers structure within maximum 3 phr of HMPC were investigated for

flexible packaging.

The reason for using HPMC in bioblends is the expectation that it could increase the oxygen and

moisture barrier, improve the mechanical and the optical properties in the direction of transparency

by giving elasticity to the structure. The antimicrobial effect on the films were be examined by adding

1 phr titanium oxide (TiO2) to the option, which provides the most flexible packaging quality for both

PHA/PHBV and PBAT/PHBV blends. In the light of this study, optimum biopolymer ratios and additive

amounts for semi-industrial production have been determined.