Overview
Crosslinkable polyolefins are specialized polymers that undergo molecular crosslinking when exposed to heat, radiation, or chemical initiators. This process creates a three-dimensional network structure that significantly enhances the material's thermal resistance, mechanical strength, and chemical stability compared to conventional polyolefins. Developed in the mid-20th century, these materials combine the processing advantages of thermoplastics with the performance characteristics of thermosets. The crosslinking can be achieved through various methods including peroxide initiation, silane grafting, or electron beam radiation, each offering distinct processing and performance benefits.
Physical and Chemical Properties
Before crosslinking, these materials exhibit typical thermoplastic behavior with melt temperatures around 120-140°C. After crosslinking, they become thermoset-like with improved heat resistance (up to 150°C continuous use) and enhanced mechanical properties including tensile strength and abrasion resistance. The crosslinked structure provides excellent resistance to environmental stress cracking, chemicals, and solvents. Electrical properties make them particularly valuable for insulation applications, with volume resistivity typically exceeding 10^16 ohm-cm. The degree of crosslinking, often measured by gel content, directly correlates with these enhanced properties.
Main Applications
The primary application is in wire and cable insulation, where crosslinked polyolefins account for approximately 60% of the market. Medium and high voltage power cables benefit from the material's combination of electrical properties and thermal stability. In automotive applications, crosslinked polyolefins are used for under-the-hood components, fuel system parts, and interior trim where heat resistance is critical. The construction industry utilizes these materials for hot water piping systems and insulation layers in composite panels. Emerging applications include medical device components and specialty packaging requiring sterilization resistance.
Safety and Storage
While generally safe to handle, uncrosslinked material may contain peroxide initiators or other reactive components requiring special precautions. Store in original packaging away from heat sources and oxidizing agents to prevent premature crosslinking. Processing requires attention to temperature control as excessive heat can initiate premature crosslinking in the processing equipment. Proper ventilation is essential during processing to manage any decomposition products. Crosslinked material is chemically inert and presents minimal handling concerns in finished products.
B2B Procurement Guide
When sourcing crosslinkable polyolefins, clearly specify the intended crosslinking method as this determines material formulation. Key parameters to define include required gel content (typically 65-85%), thermal class rating, and any industry-specific certifications needed (UL, RoHS, etc.). Consider the entire value chain - some suppliers offer compounds ready for immediate processing while others provide base resins requiring compounding. Lead times can vary significantly (2-8 weeks) depending on grade specificity and order volume. For large volume purchases, explore tiered pricing structures and consider regional production availability to optimize logistics costs.
Related Manufacturers
- 主营：POM 100P、POM 500P、POM 900P、PA66 ST801、PC 2856、PC 2858、PC 2805、PC 2807、ABS PA-757、ABS PA-747、ABS PA-758R、ABS PA-758
- 主营：电缆料、护套料、绝缘耐寒料、低烟无卤聚烯烃电缆料、紫外光辐照交联低烟无卤电缆料、改性塑料、哑光弹性体电缆料、丁腈复合物、丁腈电缆料、丁硅电缆料、NBR丁腈粉末、90度电缆料、PVC电缆料、PVC绝缘料、低烟无卤电缆塑料颗粒、耐油低烟无卤电缆料、工业丁硅电缆专用料、丁硅复合物电缆料、丁硅电缆绝缘料、医院用拉管塑料颗粒、哑光电缆料、哑光电线电缆料、哑光pvc电缆料、pvc哑光料、丁晴pvc电缆料
- 主营：母排管、新材料、缠绕带、波纹管、保护盒、热熔胶、臂热缩、防护盒、保护管、标识卡、变压器、收缩管、自融带、电缆头、标签管、自粘带、护套管、冷缩管、电胶布、防护罩、卡扣管、热缩盒、双臂热、硅胶带、终端头