DCPD High-Stiffness UPR
Key Features
- Highest modulus in the DCPD UPR product range (4.5-5.0 GPa)
- Low styrene (<30%) for VOC compliance
- Excellent surface cure properties
- Improved HDT vs. standard orthophthalic grades
- Consistent properties for certified structural applications
DCPD High-Stiffness UPR is a premium dicyclopentadiene-modified unsaturated polyester formulated with a high DCPD incorporation level to maximize the stiffness and modulus of cured composites while maintaining low styrene content (<30%). The bicyclic DCPD ring structure, once incorporated into the polyester backbone, creates a rigid, bulky polymer chain that is highly resistant to deformation under load.
The high DCPD loading delivers a flexural modulus of 4.5-5.0 GPa in fiber-free castings and 28-38 GPa in pultruded profiles at 60% glass content. This represents a 15-25% improvement in stiffness over standard orthophthalic UPR, beneficial for structural applications where deflection is the critical design criterion. HDT is also improved to 70-80°C due to the rigid DCPD segments.
Viscosity at 25°C is 150-300 mPa·s, well-suited for pultrusion and filament winding. Surface cure properties are excellent due to the inherent DCPD surface activity that reduces surface tack. The resin delivers consistent mechanical properties with low batch-to-batch variability, critical for certified structural applications including construction profiles, utility poles, and road infrastructure components.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Clear to slightly hazy liquid |
| HDT (cured) | 70-80°C |
| Styrene Content | <30% |
| Viscosity (25°C) | 150-300 mPa·s |
| Gel Time (25°C, BPO/TBPB) | Via die cure |
| Flexural Modulus (cast, cured) | 4.5-5.0 GPa |
| Flexural Modulus (60% glass, pultruded) | 28-38 GPa |
Applications
FAQ
DCPD contains a fused bicyclic ring system (norbornene + cyclopentadiene) that, when incorporated into the polyester via Diels-Alder reaction with maleic anhydride, adds bulky, rigid ring segments to the backbone. These cycloaliphatic rings restrict chain mobility and raise the glass transition temperature, resulting in higher stiffness (modulus) and improved creep resistance compared to flexible linear-chain ortho or iso-UPR. The effect is proportional to DCPD incorporation level.
Direct Contact
💬WhatsApp +86 156 3910 0440Telegram +86 156 3910 0440✉️[email protected]Reply within 24 hours
Related Products
DCPD-Modified UPR (Low Cost)
CAS 68411-01-8
Lower material cost due to DCPD modification
Pultrusion Grade UPR
CAS 26455-61-8
Low viscosity for fast fiber wet-out
Construction FRP Profile UPR
CAS 26455-61-8
Optimized for pultrusion of structural construction profiles
Filament Winding Grade UPR
CAS 26455-61-8
Low viscosity (150-300 mPa·s) for efficient fiber wet-out in bath