Understanding Polymers and Composites

General Directions/Instructions

• Strictly no erasures.
• Write legibly.
• Use a black pen only.
• Place bags in designated area.

Learning Outcomes

• Students demonstrate understanding of non-metallic materials (polymers and composite materials).
• Students apply material selection principles to address engineering and design challenges.

True or False (1 Point Each)

• Polymer is a compound of long-chain molecules with repeating units.
• Polymers are classified into synthetic and natural types.
• Plastics can be molded into shapes with little further processing.
• Addition polymerization is the same as chain polymerization.
• Step polymerization joins two monomers to form a new molecule.
• Higher degree of polymerization results in higher strength but higher viscosity.
• Copolymer of ethylene and propylene has elastomeric properties.
• Thermoplastics are solids at room temperature but become viscous liquids when heated.
• Elastomers exhibit high elasticity under low stress.
• Injection molding forces molten polymer under pressure into a die.

Identification (1 Point Each)

• Composite material: A material system with distinct phases producing combined properties.
• Structural member: A component that must withstand loads.
• Polymer Matrix Composite (PMC): Non-recyclable, typically a liquid.
• Polymeric Matrix Composite (PMC): Widely used resins in many applications.
• Polyimide: Classified as thermoplastic or thermosetting, used in various applications.
• Engineering polymer: Used in manufacturing parts with diverse applications.
• Thermoplastic polymer: Large class of synthetic polymers, highly used.
• Polypropylene: Commonly used commercial polymer with chemical and mechanical strength.
• Metal Matrix Composites (MMC): Materials with additional ceramic phases for enhanced properties.
• Ceramic Matrix Composites (CMC): Mixtures of one or more ceramic phases for enhanced properties.

Multiple Choice (1 Point Each)

• Design Focus: Primarily concerned with product functions.
• Workable Design: Detailed plan (geometric features, dimensions, materials) for manufacturing.
• Production Compatibility: Assess production compatibility with speed and quantity.
• Process Steps: Structured steps converting inputs to outputs.
• Product Output: Products or services resulting from the process.
• Recipient of Output: Recipient of the produced output.
• Process Provider: The provider of inputs into a process.

Case History Method & New Product Development

• Safest and most comprehensive approach.
• Evaluates current product and its manufacturing method.
• Begins by evaluating past engineering, materials, methods, or competitor practices.