Term of Award

Spring 2025

Degree Name

Master of Science in Applied Physical Science (M.S.)

Document Type and Release Option

Thesis (open access)

Copyright Statement / License for Reuse

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Department

Department of Chemistry and Biochemistry

Committee Chair

Rafael Quirino

Committee Member 1

Hossein Taheri

Committee Member 2

Rocio Perez

Abstract

Binder-jet 3D printing as a transformative technology in additive manufacturing, offers the ability to fabricate complex structures with diverse materials. This thesis investigates the use of a sustainable tung oil-based resin to create composites, exploring the potential for an eco-friendly alternative to synthetic binders.

The aim of this research is to develop and characterize a bio-based resin formulation, using tung oil as the primary binder, for application in binder-jet 3D printing with sand as the reinforcement. The resin formulation was prepared by combining tung oil, n-butyl methacrylate, divinylbenzene, and di-tert-butyl peroxide in precise proportions, ensuring a balanced mixture that supports rapid polymerization and crosslinking. Thirteen different sand samples were incorporated into the resin at controlled ratios to fabricate composite specimens.

The composites were subjected to compression tests using a universal testing machine to determine its mechanical characteristics. Also, ultrasound testing was employed as a non-destructive method to assess the internal integrity and bonding quality of the composites. The resin’s viscosity was optimized through controlled thermal treatment in a convectional oven, and its stability was monitored over 15 days under both room temperature and freezer conditions using a hybrid rheometer.

The results show that tung oil-based resin achieved effective bonding across all sand, with peak compressive strengths reaching up to 7.2 MPa. Young’s modulus values varied significantly between samples, indicating that sand type and particle distribution play critical roles in defining the mechanical behavior of the composites. Ultrasound testing confirmed uniform dispersion and integrity of the resin within the sand matrix. Viscosity optimization revealed a direct relationship between heating duration and resin thickening, with an optimal viscosity range (10–14cP) achieved after 255 minutes of thermal treatment. Furthermore, storage studies indicated that resin viscosity remains more stable under freezer conditions compared to room temperature.

The findings validate the potential of tung oil as a sustainable binder in sand-based and it establishes that Tung oil is a promising candidate for binder-jet 3D printing applications. Its ability to form composites with varied sand types, along with its sustainability and process optimization, positions it as an innovative solution for modern additive manufacturing challenges.

OCLC Number

1517947373

Research Data and Supplementary Material

Yes

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