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Analysis of the Properties of Cyclic Olefin Copolymer
Release time:
2024-02-22
1. physical properties
1. Optical performance
Due to the absence of chromophoric groups in the structure, the COC material exhibits excellent transparency for light sources that can stimulate quantum absorption. In the visible light range, the light transmittance of COC is equivalent to that of polymethyl methacrylate.
2. Glass transition temperature Tg
The COC backbone is extremely rigid due to the strong cyclic structure, exhibiting a high glass transition temperature. For COC, with the increase of the insertion rate of cyclic olefin monomer, the glass transition temperature showed an increasing trend.
3. Molding processability
The COC material can be processed by various molding methods such as injection molding, extrusion, and blow molding. In particular, the COC material can be processed by thermoforming, which is difficult to be used for crystalline polyolefin resins. Due to its good coatability and adhesion, COC can also be used for secondary processing and thermal welding.
2. chemical properties
1. Chemical resistance
COC material has the advantages of excellent water resistance, alkali resistance, salt resistance and polar solvent resistance of polyolefin materials, so it will not swell and cause changes in optical and mechanical properties.
2. Hygroscopicity
The molecular structure of COC is completely different from that of general polyolefins. Its main chain and branch chains contain hard non-polar cyclic structures, which give COC a very low moisture absorption rate. COC is one of the polymers with the lowest water absorption rate of all plastics. Its extremely low water absorption rate makes it extremely stable in dimension and refractive index.
3, non-toxic
COC material uses non-toxic monomer as raw material, with blood compatibility, no cell toxin, no induced organic mutation, no stimulation and other advantages, suitable for syringes and vials. Not only that, the COC material has a strong resistance to high-energy radiation and ethylene oxide sterilization, and can be sterilized without damaging the material.
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