Topic polymers

Products polymers

Two new microwave reaction systems providing the best solutions for your sample preparation

Based on its longstanding experience, Anton Paar launches two new microwave reaction systems for sample preparation: Multiwave PRO and Multiwave ECO more

Thermal Field-Flow Fractionation: Ultra-Broad Polymer Separation

The new Postnova TF2000-MALS series is a truly unique and innovative technology for polymer/particle separation and characterization. The analysis can be achieved over a huge molar mass and size range and under extremely gentle conditions without any shear forces and sample degradation more

Break-through in High Temperature Polymer Separation Technology

The AF2000 HT Series is the world's first commercial HTFFF instrument available and was invented and patented by Postnova Analytics. High Temperature Field-Flow Fractionation is a brand new technology ideally suited for the advanced separation of high molar mass polymers, such as polyethylene and polypropylene. more

News polymers

• New technology allows lenses to change color rapidly

  A University of Connecticut scientist has perfected a method for creating quick-changing, variable colors in films and displays, such as sunglasses, that could lead to the next hot fashion accessory.The new technology also has captured the interest of the U.S. military as a way to assist soldiers wh more

• Building a smaller, lighter future: Understanding polymer behaviors below 1 nanometer

  Knowing how to build nanosized assemblies of polymers (long molecular chains) holds the key to improving a broad range of industrial processes, from the production of nanofibers, filters, and new materials to the manufacture of low-energy, nanoscale circuits and devices. A recent paper in Nature Com more

• Nanoparticles for Cultural Heritage Conservation

  The conservation of Mayan wall paintings at the archaeological site of Calakmul (Mexico) will be one on the subjects touched upon by Piero Baglioni (based at the University of Florence) in his invited lecture at the 3rd European Chemistry Congress in Nürnberg in September. In a special issue of Chem more

White papers polymers

• Field-Flow Fractionation - The Universal Separation Principle for Particle and Macromolecule Characterization
  

  High molecular weight polymers, bio molecules or particles in a range of a few nanometers up to several microns are more and more important in science and technology. Many applications are based on the specific properties of these materials. For this reason, an exact knowledge of the molar mass or particle sizes distribution is essential for later application as well as for optimization of the production processes or quality control. In addition the knowledge about the chain structure of macromolecules or biopolymers as well as about the shape of particles is often necessary. For this reason those samples, which often can be very complex systems, have to be separated according to parameters such as e.g. hydrodynamic volume or molecular weight. After the separation process the resulting narrow dispersed fractions are detected with different techniques. more

• Asymmetric Flow Field Flow Fractionation (AF4) - A Powerful Method for Polymer Characterization

  The AF4-MALS combined technique can serve as a routine method for polymer analysis and characterization. AF4 provides separation efficiency entirely comparable with traditionally used and so far dominating SEC. In addition, it yields superior separation of branched polymers, polymers containing ultra high molar mass fractions up to at least 108 g/mol, and nanoparticles. This contribution outlines the theoretical background of the method and shows several examples of its use, e.g. separation of high molecular weight polymers and particles. While SEC will certainly continue to be the most frequently employed method of polymer analysis, for many samples the description of molecular structure is more detailed if both SEC and AF4 are used. The possibility to run both SEC and AF4 on the same experimental set-up makes the AF4 method a powerful and versatile tool for the characterization of a variety of synthetic and natural polymers and related materials. more

• Polyolefins: Determination of Molecular Weight and Branching Structure by GPC/SEC

  Polyethylene and Polypropylene are so-called Polyolefins. They are produced in large amounts every year. Depending on the process and catalyst used linear or branched polymers can be produced. In case of e. g. Polyethylene there are at least three polymer types: HDPE (High Density Polytheylene), LDPE (Low Density Polyethylene) and LLDPE (Linear Low Density Polytehylene). HDPE and LLDPE are made of linear or only slightly branched macromolecules with a high level of crystallinity. They form a dense structure in the final product. LDPE is made of highly branched molecules that form a final structure with low density due to a low degree of crystallinity. more

Websites polymers