Monomers are small, simple molecules that serve as the building blocks for polymers. A resin, however, can be a polymer that is formed when monomers bond together through a process called polymerization. While all resins are made from monomers, not all monomers are used to make resins. Resins can be natural or synthetic and are often used in manufacturing plastics, adhesives, and coatings. Therefore, while monomers and resins are closely related in the context of materials science and chemistry, they are not the same thing. Monomers are the basic units, whereas resins are the complex substances derived from these units through chemical reactions.

Creating a plastic injection mold in SolidWorks involves several steps. First, design the part you intend to mold, ensuring it meets molding requirements like proper draft angles. Next, use SolidWorks’ Mold Tools. Begin by selecting the part, then navigate to the SolidWorks toolbar and choose "Mold Tools." Here, you can use commands like "Parting Lines" to define where the mold halves will separate and "Shut Off Surfaces" for closing any openings. "Tooling Split" is used to create the actual mold cavity and core, from which you must subtract the volume of your original model. Fine-tuning the mold design may include adding ejection pin locations and cooling channels. Before finalizing, simulate the injection process using SolidWorks Plastics to identify and rectify potential issues like air traps or insufficient fill. Remember, successful mold design also requires consideration of the material properties and the intended production volume.

Applying epoxy to a cracked log involves several steps to ensure a strong, durable repair. First, clean the log thoroughly to remove dirt and debris. Use a stiff-bristled brush and a mild detergent if necessary. Once cleaned, let the log dry completely. Next, widen the crack slightly using a chisel or similar tool to ensure the epoxy will adhere well. Apply a wood hardener if the log is soft or porous to create a better surface for the epoxy. Choose a high-quality epoxy suitable for outdoor use, as this will offer better resistance to weather and UV rays. Mix the epoxy according to the manufacturer's instructions, usually in a 1:1 ratio. Apply the epoxy generously into the crack using a putty knife or similar tool. Ensure the epoxy fills the entire crack, pushing it in firmly to eliminate any air gaps. Allow the epoxy to cure for at least 24 hours or as directed by the product's guidelines. Sand the cured epoxy lightly with fine-grit sandpaper to smooth out any rough spots. Finally, apply a sealant or varnish to protect the repaired area from moisture and further damage.