Investigation of Barrier and Mechanical Properties of Biopolymer Based Flexible Laminated Packaging Films

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

38th International Conference of Polymer Processing Society, Sankt Gallen, İsviçre, 22 - 26 Mayıs 2023, ss.463

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Sankt Gallen
  • Basıldığı Ülke: İsviçre
  • Sayfa Sayıları: ss.463
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

In packaging industry, the most promising biopolymers such as thermoplastic starch (TPS),

polybutylene succinate (PBS), polylactic acid (PLA), and polybutylene adipate-co-terephthalate (PBAT),

polycaprolactone (PCL), and polyhydroxyalkanoate (PHA), are used due to their potential

biodegradable, sustainability and zero carbon footprint emissions instead of

nonbiodegradable/fossil-derived polymers. For example, thermoplastic starch has oxygen and carbon

dioxide permeability are better than moisture permeability, but in terms of mechanical and barrier

properties, it is below the limit values compare to traditional industrial packaging applications. That’s

why TPS is tried to usable in the packaging industry by compounded with other biopolymers, and

additives, coating or laminated to improve its weak properties. Recently, the coating technology of

new generation packaging films with bio-based materials has attracted a lot of attention. Cellulose

nanocrystals (CNCs), which is one of these providers, has an important place in packaging preserving

thanks to its oxygen and moisture transmission performance, durability features and ecologically

friendly features.

In this study, the biopolymer-based flexible laminated packaging films were produced by using

different commercial biopolymers such as TPS, PBS, PLA PBAT, PCL, and PHA. Firstly, biopolymers were

compounded within the maximum rate 1,25 phr of adipic acid and a polymeric epoxy-based chain

extender in the twin screw extruder and then turned into a film helping by the blown film extruder.

On the other hand, the paper was coated by 3-5 gsm of two different CNCs-based solution which has

barrier properties against oxygen and moisture. According to optimum CNCs solution coating gsm

range on paper were defined. Our biopolymer films were laminated with CNCs solution coated paper

using a water-based compostable adhesive. The effect of CNCs solution coating on barrier properties

of packaging films and mechanical & barrier comparison of different laminated/non-laminated film

structures were investigated.