Which factor imparts the crytalline nature to a polymer like nylon?

Options

A. Strong intermolecular forces like hydrogen bonding between chains.
B. van der Waals forces between the polymeric chain
C. Close packing of the chains due to ionic bonding between the chains .
D. Three- dimensional network of chains.

Explanation

To determine which factor imparts the crystalline nature to a polymer like nylon, we can follow these steps:

### Step 1: Understand the Structure of Nylon
Nylon is a type of polyamide, and its structure can be represented as a repeating unit. For example, nylon 6,6 consists of hexamethylenediamine and adipic acid. The repeating unit includes amide linkages (-CONH-) which are crucial for its properties.

**Hint:** Look for the repeating units and functional groups in the polymer structure.

### Step 2: Identify the Intermolecular Forces
In nylon, the presence of nitrogen (N) and oxygen (O) in the amide functional groups allows for hydrogen bonding. The hydrogen atoms attached to the nitrogen can form hydrogen bonds with the carbonyl oxygen of adjacent chains.

**Hint:** Consider how functional groups can interact with each other through intermolecular forces.

### Step 3: Explain the Role of Hydrogen Bonding
The strong intermolecular hydrogen bonding between the chains of nylon contributes to its ordered arrangement. This leads to a higher degree of crystallinity as the chains can align closely and pack efficiently.

**Hint:** Think about how strong interactions between molecules can affect their arrangement and properties.

### Step 4: Conclude the Reason for Crystalline Nature
Due to the strong intermolecular hydrogen bonding, nylon exhibits a crystalline nature, characterized by a highly ordered structure. This is in contrast to amorphous polymers, which lack such order.

**Hint:** Summarize how the specific interactions in the polymer lead to its overall structural characteristics.

### Final Answer
The crystalline nature of nylon is primarily due to strong intermolecular hydrogen bonding between the polymer chains.