Development of Biodegradable Rigid Foams from Pineapple Field Waste.

Area of Science:

• Materials Science
• Polymer Science
• Sustainable Materials

Background:

• Agricultural waste, particularly from pineapples, presents an underutilized resource.
• Developing sustainable and biodegradable materials is crucial for environmental protection.
• Traditional methods for producing composite foams can be energy-intensive and less eco-friendly.

Purpose of the Study:

• To create novel biodegradable rigid composite foams using pineapple waste.
• To investigate a unique processing method involving gel formation and filler blending.
• To evaluate the physical, mechanical, and biodegradability properties of the developed foams.

Main Methods:

• Pineapple stem starch and leaf cellulose were extracted and utilized as matrix and filler, respectively.
• A starch gel was formed using a microwave oven, incorporating glycerol.
• The pineapple leaf filler was blended into the starch gel using a two-roll mill.
• Foaming was achieved via compression molding at 160 °C.

Main Results:

• The resulting pineapple-based foams exhibited densities between 0.43-0.51 g/cm³ and a highly amorphous structure.
• Foams showed good moisture absorption (8-10% equilibrium content) and high water absorption capacity (150-200% of own weight).
• Flexural strengths ranged from 1.5-4.5 MPa, influenced by filler and glycerol content.
• Complete biodegradation into particles ≤1 mm occurred within 15 days via soil burial tests.
• An eco-friendly single-use foam tray was successfully fabricated.

Conclusions:

• Pineapple waste materials can be effectively transformed into sustainable, biodegradable rigid composite foams.
• The novel gel formation and filler blending method offers an alternative to conventional foam processing.
• The developed foams possess desirable properties for potential applications, contributing to waste valorization and sustainable material development.