DEVELOPMENT OF PP/PC SHAPE MEMORY POLYMER BLEND THERMOPLASTIC COMPOSITES
Shape memory polymers (SMP) are smart materials that can return from their deformed temporary shape to their permanent, original shape when triggered by an external stimulus. SMPs generally appear as mixtures and/or composites to create new SMP. Especially in developing new SMP, polymer blending is one of the most preferred methods for production convenience and economy. In renewable energy production systems such as wind turbines, ocean waves, etc., loading and environmental conditions produce damage and deformation mechanisms that cause repair difficulties and high maintenance costs. Therefore, this study proposed to develop a shape memory matrix or covering materials for thermoplastic composites used in renewable energy systems.
PP/PC thermoplastic polymer blend and each component's SM properties were investigated. PP and PC granules were mixed with a mechanical mixer at different rates. Then, a thin film was produced at 200°C using a hot press. For the tests, samples measuring 15 mm by 70 mm were prepared. Pure thermoplastics and blends were evaluated for their SM performance with external heat triggering.
The most remarkable shape recovery rate was seen in pure PP and pure PC, respectively. It was observed that the mixing ratios did not directly affect the shape fixation ratio, and as the PC ratio increased, the shape recovery percentage decreased.
Pure or blended SM thermoplastics are suitable for use as matrix materials in composite structures, can reduce maintenance costs, and prolong the life of the structures when triggered by an external stimulus, such as heat.
Keywords - Shape Memory, Thermoplastic Polymer Blend, PP/PC Blend.