Introduction to Polymers
Notes
See all →Top questions
See all →- What is the difference between thermoplastic and thermosetting polymers? In one line Thermoplastics soften on heating and harden on cooling repeatedly because their linear chains are held by weak forces, while the... 1
- How are polymers classified by origin, structure, polymerisation type and composition? In one line Polymers are classified in several ways: by source (natural, semi-synthetic, synthetic), by chain structure (linear, branched, c... 1
- What are number average and weight average molecular weights of a polymer and what is polydispersity? In one line Because a polymer sample contains chains of many different lengths, its molecular weight is expressed as an average: the number... 1
- How do you calculate number average and weight average molecular weight in a numerical? In one line Make a table of N_i, M_i, N_iM_i and N_iM_i², then use M_n = ΣN_iM_i/ΣN_i and M_w = ΣN_iM_i²/ΣN_iM_i. Explained simply The metho... 1
- What is the difference between crystalline and amorphous polymers, and what controls crystallinity? In one line In crystalline regions polymer chains are packed in an ordered, regular way, while in amorphous regions they are randomly coiled... 1
- What is the glass transition temperature of a polymer and what factors affect it? In one line The glass transition temperature (T_g) is the temperature below which an amorphous polymer is hard, rigid and glassy, and above... 1