1. What is Mass Fraction of Crystalline Components?

Definition: The mass fraction of crystalline components is the fraction of total mass of that crystalline component from the total mass of specimen present in a polymer.

Purpose: This calculation helps in understanding the composition and properties of semi-crystalline polymers.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \mu_c \) — Mass fraction of crystalline components
• \( v'_a \) — Specific volume of amorphous component (m³/kg)
• \( v' \) — Specific volume of specimen (m³/kg)
• \( v'_c \) — Specific volume of crystalline component (m³/kg)

Explanation: The formula compares the volume differences between amorphous and crystalline states to determine the mass fraction.

3. Importance of Mass Fraction Calculation

Details: Knowing the crystalline fraction helps predict material properties like density, strength, and thermal behavior in polymers.

4. Using the Calculator

Tips: Enter the specific volumes (in m³/kg) for amorphous component, specimen, and crystalline component. The amorphous volume should be greater than the crystalline volume.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for specific volumes?
A: For many polymers, amorphous components range 0.001-0.005 m³/kg, while crystalline components are typically 10-30% less.

Q2: How is specific volume measured?
A: Specific volume is often determined through density measurements or dilatometry techniques.

Q3: What if my amorphous volume is less than crystalline?
A: This is physically impossible - check your measurements as crystalline phases are always more dense than amorphous.

Q4: Can this be used for polymer blends?
A: Yes, but only if the blend has distinct crystalline and amorphous phases.

Q5: How accurate is this calculation?
A: Accuracy depends on precise measurement of specific volumes, typically within ±5% when measurements are careful.