Polymer Density Calculator
Estimate Density from Structure & Crystallinity
Select polymer or input repeat unit mass and volume, then adjust crystallinity.
Results
Amorphous Density = — g/cm³
Crystalline Density = — g/cm³
Final Density = — g/cm³
van Krevelen Estimate = — g/cm³
The Polymer Density Calculator is a scientifically accurate, interactive tool that computes **polymer density** using **van Krevelen group contribution**, **amorphous/crystalline mixing rule**, and **molar volume additivity**. It supports **predefined polymers** and **custom repeat units**. Essential for **material selection**, **packaging**, **biodegradable mulch**, and **recycling**. Achieve precise density prediction instantly. Explore sustainable polymers at Agri Care Hub.
What is Polymer Density?
**Polymer density** is mass per unit volume (g/cm³). It depends on:
- Chemical structure (van Krevelen)
- Crystallinity (X_c)
- Branching, tacticity
- Temperature, pressure
Learn more on Polymer Density SciPoly.
Scientific Foundation: van Krevelen Method
Density from molar volume:
V = Σ (group volumes)
Crystallinity mixing:
where w_c = X_c / 100
Importance of Polymer Density
Critical for:
- Buoyancy: Floating mulch
- Barrier: Food packaging
- Strength-to-weight: Composites
- Recycling: Sorting by density
- Biodegradability: PLA mulch
In farming, **low-density mulch** floats for irrigation — a focus at Agri Care Hub.
User Guidelines
Steps:
- Select polymer or enter MW and V
- Input ρ_a, ρ_c, X_c
- Click “Calculate Polymer Density”
Use 0% crystallinity for amorphous
When and Why to Use
Use when you need to:
- Predict HDPE bottle weight
- Design floating mulch film
- Compare PET vs. PLA
- Teach polymer physics
- Optimize biodegradable packaging
Purpose of the Calculator
To make **density prediction fast and accurate**. It bridges **structure to property**.
Example: HDPE
- MW = 28.05, V = 33.5 cm³/mol
- ρ_a = 0.85, ρ_c = 1.00, X_c = 60%
- ρ = 0.94 g/cm³
Predefined Polymers
- HDPE: 0.94–0.97 g/cm³
- LDPE: 0.91–0.94 g/cm³
- PP: 0.90–0.91 g/cm³
- PET: 1.38–1.40 g/cm³
- PLA: 1.24–1.27 g/cm³
Applications in Agriculture
Density enables:
- Floating irrigation films
- Biodegradable mulch
- Seed coating buoyancy
- Greenhouse panels
Learn more at Agri Care Hub.
Scientific Validation
Based on:
- van Krevelen (1990) “Properties of Polymers”
- Bicerano “Prediction of Polymer Properties”
- Mark “Physical Properties of Polymers Handbook”
- Polymer Density SciPoly
Benefits
- 100% accurate
- Crystallinity included
- Mobile-friendly
- No login
- SEO-optimized
Conclusion
The Polymer Density Calculator is your essential tool for polymer material science. From lab design to biodegradable mulch, it delivers **precision and sustainability**. Start calculating density today with Agri Care Hub.