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Nylon is not a non-condensation polymer; it is actually a product of condensation polymerization. This type of polymerization involves the reaction of monomer units with the elimination of small molecules such as water. Specifically, nylon forms through a condensation reaction between a diamine and a dicarboxylic acid or a diacid chloride, resulting in the elimination of water or hydrogen chloride. This process forms long chains, characteristic of polymers, with strong amide bonds. The resultant nylon polymer consists of repeating units linked by amide bonds, which contribute to its durability and versatility, making it well-suited for use in textiles, automotive parts, and more.
Discharge ink printing is a specialized screen-printing technique that removes dye from fabric rather than adding ink on top. This process works best with 100% cotton garments pre-dyed with reactive dyes. Key do's include using high-quality discharge ink, ensuring the design is suitable for discharge (avoid very detailed designs), and pre-testing fabrics to ensure compatibility. Pre-washing garments can also help achieve consistent results. As for don'ts, avoid using this technique on synthetic materials or blends with unknown compositions, as it may not work or could damage the fabric. Also, don't mix discharge inks with regular plastisol inks, as it can neutralize the discharge properties. Lastly, resist the temptation to rush the curing process, as inadequate curing can lead to poor discharge effects.
Commodity polymers, widely used due to their cost-effectiveness and versatile properties, number into dozens. Key examples include Polyethylene (PE), Polypropylene (PP), Polystyrene (PS), and Polyvinyl Chloride (PVC). These materials form the backbone of the global plastics industry, serving in applications from packaging to automotive parts. Their prevalence is due to a combination of ease of manufacture, scalability, and functional properties such as durability, flexibility, and resistance to chemicals. While the exact count can vary based on classification criteria, the most significant types by consumption and application remain relatively few, centered around those mentioned and a handful of others like PET (Polyethylene terephthalate) and Polycarbonate (PC).
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