Question

1.Why are moles more accurate for determining cross-linking ratio than weight?

2. What advantage does the liquid in stereolithography provide?

Answer 1

1. Moles represents the number of molecules. When the polymer considered based on weight/concentration (with varied length), the cross linking ratio will be biased because two different length polymers with same concentration have different molecules. To normalize as well as nullify the bias, for getting the exact cross-linking ratio, moles of each polymer considered.

2. Stereolithography is referred to as SLA 3D printing. It works by using a high-powered laser to harden liquid resin that is contained in a reservoir to create the desired 3D shape. In other word, this process converts photosensitive liquid into 3D solid plastics in a layer-by-layer fashion using a low-power laser and photopolymerization.