CHEMICAL COMPOSITION DISTRIBUTION

CCD: The Key to Understanding Complex Polyolefins

Chemical composition distribution (CCD) is a key property of polyolefins that can be used to characterize their performance. CCD is often the most discriminating feature in complex polyolefins, as it can be used to distinguish between different resins with similar properties.

The CCD of a polyolefin is determined by the comonomer content, which is the amount of comonomer (such as ethylene or propylene) in the resin. The comonomer content affects the melting point and crystallization behavior of the resin, which in turn affects its properties.

Polymer Char's CCD Analytical Instruments

Polymer Char offers a range of analytical instruments that can be used to measure the CCD of polyolefins. These instruments include CEF, TGIC, CRYSTAF, and CRYSTAF-TREF.

• CEF: Crystallization Elution Fractionation (CEF) is a new approach for measuring Chemical Composition Distribution (CCD) in polyolefins. CEF combines CRYSTAF and TREF separation mechanisms to provide a fast and accurate measurement of CCD. CEF is a valuable tool for characterizing the properties of polyolefins and for ensuring product quality.
• TGIC: Thermal Gradient Interaction Chromatograph (TGIC) is a technique developed and patented by The Dow Chemical Company. TGIC is used to analyze the composition distribution in polyethylene copolymers. TGIC is a valuable tool for characterizing the properties of polyethylene copolymers and for ensuring product quality.
• CRYSTAF: CRYSTAF is a method for measuring the chemical composition distribution (CCD) of polyolefins. The technique is based on the principle of crystallization analysis fractionation (CRYSTAF). In CRYSTAF, a sample of polyolefin is dissolved in a solvent and then cooled slowly. As the sample cools, the different components of the polyolefin crystallize at different temperatures. The resulting crystals are then separated by size and analyzed to determine the CCD of the sample.
• CRYSTAF-TREF: CRYSTAF-TREF is a technique that combines CRYSTAF and TREF separation mechanisms. CRYSTAF-TREF is used to measure the chemical composition distribution of polyolefins. CRYSTAF-TREF is a valuable tool for characterizing the properties of polyolefins and for ensuring product quality.

The main difference between CEF and CRYSTAF-TREF is that the crystallization cycle in CEF is performed dynamically under solvent flow in a long column that contains an inert support material. CEF combines the separation power of CRYSTAF in the crystallization step with the separation achieved in TREF during the elution cycle. CEF has been shown to be superior to both TREF and CRYSTAF and is capable of providing very fast analysis of the composition distribution of polyolefins for high-throughput applications.

To learn more about CCD measurement in polyolefins, contact us today!

Manufacturer's website : http://www.polymerchar.com