Which factor imparts crystalline nature to a polymer like nylon?
Strong intermolecular forces like hydrogen bonding and linear structure that lead to close packing of chains and hence, imparts crystalline character. e.g., nylon
Name the polymer used in laminating sheets and give the name of monomeric units involved in its formation.
Urea formaldehyde resin is used for laminated sheets. The monomer of this resin is urea $\left(\mathrm{NH}_2 \mathrm{CoNH}_2\right)$ and formaldehyde $(\mathrm{HCHO})$
Which type of biomolecules have some structural similarity with synthetic polyamides? What is similarity?
Polyamides have structural repeatation of amide linkages which is similar to peptide bond as present in polypeptide chains of proteins.
Why should the monomer used in addition polymerisation through free radical pathway be very pure?
During free radical polymerisation, monomers should be very pure because even very trace amounts of impurities may act as inhibitors which leads to the formation of polymers with shorter length.
Match the polymer of Column I with correct monomer of Column II.
| Column I | Column II | ||
|---|---|---|---|
| A. | High density polyethene | 1. | Isoprene |
| B. | Neoprene | 2. | Tetrafluoro ethene |
| C. | Natural rubber | 3. | Chloroprene |
| D. | Teflon | 4. | Acrylonitrile |
| E. | Acrilan | 5. | Ethene |
A. $\rightarrow$ (5) B. $\rightarrow$ (3) C. $\rightarrow$ (1) D. $\rightarrow$ (2) E. $\rightarrow$ (4)
Column I represents various kind of polymer and Column II represents their monomer units. Correct matching can be done as
| Column I | Column II | ||
|---|---|---|---|
| A. | High density polyethene | 1. | Ethene |
| B. | Neoprene | 2. | Chloroprene |
| C. | Natural rubber | 3. | Isoprene |
| D. | Teflon | 4. | Tetrafluoroethene |
| E. | Acrilan | 5. | Acrylonitrile |