Polyolefin Analysis Blog

A blog on polymer analysis and all things related

Short-chain Branching in polyolefins: what causes short-chain branches and how to study them.

  Polyolefin copolymer resins incorporate comonomers such as 1-butene, 1-hexene, or 1-octene, which results in short-chain branches irregularly added that influence the crystallinity and final density of the resin. Depending on their density, the resulting resins are classified as high-density . . . read more »

Chemical Composition measurement in GPC/SEC analysis. Differentiating polyolefins with similar Molar Mass Distribution.

  The simultaneous analysis of concentration and chemical composition in Gel Permeation Chromatography (GPC) or Size Exclusion Chromatography (SEC) is of significant interest for today’s complex polyolefin copolymers. In polyethylene and copolymers, chemical composition is centered around the study of . . . read more »

Why it is important to analyze the Chemical Composition Distribution in polyolefins

  Polyolefins with heterogeneous chemical composition are becoming prevalent in the industry. These resins are produced by incorporating comonomers into the main chain in order to reduce their crystallinity and extend the range of product performance. To define these copolymers, . . . read more »

Advantages of Size Exclusion Chromatography (SEC/GPC) for polyolefins

Polyolefin resins have become complex polymers by design, achieved with multi-reactor processes and the incorporation of comonomers that improve their performance for the desired application. This design complexity requires advanced methods of analysis, as the average properties measured by melt . . . read more »

Practical considerations in Gel Permeation Chromatography analysis of polyolefins

  • February, 15 2021
  • Category: GPC/SEC

This guide covers some practical considerations regarding solvent, analysis conditions, and laboratory supplies needed for analyzing polyolefins by Gel Permeation Chromatography (GPC) or Size Exclusion Chromatography (SEC) technique.   The data and recommendations presented here have been derived from the . . . read more »

How to choose the most appropriate combination of detectors for high temperature SEC/GPC analysis of polyolefins

  High Temperature Size Exclusion Chromatography (SEC) – also called Gel Permeation Chromatography (GPC) – is the most widespread technique to characterize the microstructure of polymers. Different detector-configurations can be used with SEC instrumentation, each of them contributing to the . . . read more »

Comparison of Infrared detectors for GPC/SEC analysis

  By coupling GPC-IR and GPC-QC* with any of Polymer Char’s Infrared detectors – IR4, IR5, or IR6 – it is possible to obtain both molecular weight distribution and chemical composition information of polyolefin resins. Each IR detector was developed . . . read more »

How to dry the resulting fractions obtained from a preparative fractionation system

Preparative fractionation systems, like PREP mc2 and PREP C20, fractionate polymers by dissolving them in the appropriate solvent and then separating their molecules according to certain parameters, such as molecular weight and crystallinity. At the end of the process in . . . read more »

How we make our GPC/SEC columns last longer (almost 2 years)

  As analysts in the Gel Permeation Chromatography (GPC) field, we know that picking the right columns and developing a stable analysis method is essential to delivering precise and accurate results. Even the most comprehensive analytical system will fail to . . . read more »

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