Cyclic Polycarbonate

Updated: 2026-09-20

Overview

Cyclic Polycarbonate (CPC) is a high-performance polymer characterized by its cyclic molecular architecture, which distinguishes it from conventional linear polycarbonates. This structure imparts superior thermal stability, optical clarity, and resistance to environmental stressors. Developed for advanced industrial applications, CPC is synthesized through ring-opening polymerization of cyclic carbonate monomers. Its unique properties make it ideal for precision optics and demanding engineering applications where traditional plastics fail.

Physical and Chemical Properties

CPC exhibits a glass transition temperature (Tg) of 150–180°C, significantly higher than standard polycarbonates, enabling use in high-temperature environments. Its cyclic structure reduces chain mobility, enhancing dimensional stability and reducing moisture absorption (<0.1% after 24h immersion). Optically, CPC offers low birefringence (Δn < 0.001) and maintains 92% light transmittance in the visible spectrum, outperforming PMMA and standard PC. Chemically, it resists acids, alkalis, and most organic solvents except chlorinated hydrocarbons like dichloromethane.

Main Applications

In optics, CPC is used for AR/VR lens substrates due to its minimal optical distortion and high Abbe number (34–38). The automotive industry employs it for LED light guides and head-up display components, leveraging its heat resistance (continuous use at 140°C). Electronics manufacturers utilize CPC as a dielectric material in 5G antenna housings, where its low dielectric loss (tan δ ≈ 0.01 at 10 GHz) is critical. Emerging applications include medical devices requiring repeated sterilization and aerospace interior panels needing flame retardancy (UL94 V-0 rating achievable).

Safety and Storage

CPC is classified as non-hazardous under GHS standards, with no reported carcinogenic or mutagenic effects. Processing at temperatures above 300°C may release trace phenol vapors, requiring local exhaust ventilation. Storage requires moisture-proof packaging (≤0.02% water content) to prevent hydrolysis during subsequent processing. Pellets should be stored in original sealed containers with desiccant, avoiding prolonged exposure to sunlight to prevent yellowing. Shelf life is typically 24 months when stored below 30°C.

B2B Procurement Guide

Industrial buyers should specify optical grade (e.g., haze <1%) or engineering grade (impact strength >60 kJ/m²) based on application. For injection molding, verify melt flow rate (MFR) compatibility with equipment – typical MFR ranges from 5–25 g/10min (300°C/1.2kg). Bulk orders (20+ metric tons) commonly receive 8–12% discounts. Lead times vary from 4–8 weeks for standard grades to 12+ weeks for customized formulations. Quality certifications to request include ISO 10993-1 for medical applications and IATF 16949 for automotive uses.