Final answer:
The characteristic of synthetic polymers that is NOT a problem is biodegradability, as synthetic polymers like nylon and Kevlar are prized for their high strength, low cost, and chemical resistance, but often criticized for their lack of biodegradability.
Step-by-step explanation:
Out of the characteristics given for synthetic polymers: high strength, low cost, biodegradability, and chemical resistance, the one that is NOT a problem is biodegradability. Synthetic polymers like plastics and rubbers are advantageous in many ways due to their low cost, high strength, and chemical resistance. These features make synthetic polymers highly desirable for a variety of applications including engineering, where they offer weight reduction and corrosion resistance. In contrast, biodegradability is often seen as a limitation since many synthetic polymers do not break down easily in the environment, which contributes to pollution and waste management issues.
An example of a high-strength synthetic polymer is nylon, which features amide bonds similar to those found in proteins. This material is known for being lightweight and strong, qualities that made it valuable for military applications like parachutes and ropes during World War II. Another strong synthetic polymer mentioned is Kevlar, recognized for its rigidity and strength, and used in protective gear such as bulletproof vests and helmets.