{"id":9535,"date":"2025-04-02T08:02:00","date_gmt":"2025-04-02T08:02:00","guid":{"rendered":"https:\/\/teceudemo.com\/?p=9535"},"modified":"2026-04-02T08:14:46","modified_gmt":"2026-04-02T08:14:46","slug":"case-study-thermal-barrier-coatings","status":"publish","type":"post","link":"https:\/\/www.tec-eurolab.com\/en\/case-study-thermal-barrier-coatings\/","title":{"rendered":"White Paper | Dynamic Mechanical Analysis"},"content":{"rendered":"

Dynamic Mechanical Analysis DMA<\/h2>\n

Focus and difference with DSC analysis<\/p>\n

What is DMA analysis<\/h3>\n

Dynamic-mechanical analysis (DMA)<\/strong> is a technique used in the field of thermal and materials engineering. This technique is essential for evaluating the mechanical properties of viscoelastic materials and is particularly useful in the study of polymers and composites. <\/p>\n

\n\t\t\t\t\t\t\t\t\t\t\"\"
Fig. 1. DMA machine <\/figcaption><\/figure>\n

DMA analysis evaluates how materials respond to deformation under varying temperature and frequency conditions.<\/strong> By applying an oscillating stress to a specimen and measuring its response, information can be obtained on the stiffness, damping and glass transition of the material, among other properties.
In a DMA analysis, the sample is subjected to a sinusoidal force and the resulting strain is measured. The relationship between the applied stress and strain allows parameters such as: <\/p>\n

    \n
  • Conservative modulus (E’storage): is a measure of the elastic energy stored in the material. It represents the stiffness of the material when it is deformed. <\/li>\n
  • Loss or dissipative modulus (E’loss): is a measure of the energy dissipated as heat. It indicates the viscous behavior of the material. <\/li>\n<\/ul>\n

    The main applications of DMA analysis are:<\/p>\n

      \n
    • Materials characterization<\/strong>: to study properties such as stiffness, damping and glass transition.<\/li>\n
    • Research and development<\/strong>: assists in developing new materials and improving existing ones.<\/li>\n
    • Quality control<\/strong>: ensures that materials meet the specifications required in production.<\/li>\n<\/ul>\n

      Real example on epoxy resin<\/h3>\n

      In laminated specimens consisting of thermoset epoxy resin and reinforced with glass fiber<\/strong>, thermal analysis is essential for material characterization. Normally, DSC thermal analysis is required for the determination of thermal parameters, such as: <\/p>\n

        \n
      • glass transition temperature (Tg)<\/li>\n
      • Exothermic peak of non-crosslinking (temperature and energy involved).<\/li>\n<\/ul>\n

        When the laminated sample is found to be 100 percent cross-linked (cured), DSC thermal analysis may not give a clear feedback of the glass transition temperature value. In such cases, the analytical technique to be applied may be dynamic thermal analysis (DMA). Shown below are, for the same type of epoxy resin, DSC and DMA thermograms for determining the glass transition temperature (Tg) value. <\/p>\n

        \n\t\t\t\t\t\t\t\t\t\t\"\"
        Figure 2. Determination of the Tg of an epoxy resin in DSC. <\/figcaption><\/figure>\n
        \n\t\t\t\t\t\t\t\t\t\t\"\"
        Figure 3. Tg determination of an epoxy resin in DMA <\/figcaption><\/figure>\n

        Discussion<\/h3>\n

        Glass transition temperature (Tg) values obtained by differential scanning calorimetry (DSC) and dynamic-mechanical analysis (DMA) can differ significantly. Here are some of the main differences: <\/p>\n

        Measurement method<\/h4>\n

        DSC analysis measures the heat flux required to increase the temperature of the sample. Tg is determined as the midpoint of the temperature range at which a change in the heat capacity of the material is observed. DMA analysis measures the mechanical properties of the material (elastic modulus) as a function of temperature and stress frequency. Tg is identified as the peak of the mechanical loss curve (tan \u03b4) or the point at which the (conservative) storage modulus (E’) begins to decrease dramatically. <\/p>\n

        Tg values<\/h4>\n

        Tg values obtained by DMA are generally higher than those obtained by DSC. This is because DMA measures the mechanical response of the material, which can be affected by factors such as stress frequency and heating rate. The difference between Tg values measured by the two techniques can be 10-20\u00b0C or even more. <\/p>\n

        Applications<\/h4>\n

        DSC analysis is widely used for the thermal characterization of polymers, foods, pharmaceuticals, glasses and ceramics because of its ability to provide detailed information with small amounts of sample. DMA analysis is particularly useful for studying the mechanical properties of materials as a function of temperature and frequency, making it ideal for applications where mechanical performance is critical. <\/p>\n<\/p>\n

        Conclusions<\/h3>\n

        DMA analysis related to the mechanical behavior of the material is in some cases the best solution, compared to other thermal analyses, to characterize the material. It allows for in-depth: <\/p>\n

          \n
        • Viscoelastic material properties: Elasticity and modulus of elasticity<\/li>\n
        • Stiffness and damping properties under different conditions:\n
            \n
          • as a function of temperature and frequency<\/li>\n
          • At different levels of stress and strain<\/li>\n
          • In defined gaseous atmospheres and in liquid environments<\/li>\n<\/ul>\n<\/li>\n
          • Identification of Material Reactions and Phase Transitions<\/li>\n
          • Glass transition temperature of highly cross-linked polymers and composites<\/li>\n
          • Compatibility of polymer blends with reference to composition and structure<\/li>\n
          • Influence of filler and additive content<\/li>\n
          • Polymerization and post-polymerization (cross-linking reactions)<\/li>\n
          • Analysis of the influences of aging<\/li>\n
          • Creep and relaxation processes<\/li>\n<\/ul>\n

            Do you want to test the strength of your coatings?<\/h2>\n

            Request information<\/p>\n","protected":false},"excerpt":{"rendered":"

            Discover Dynamic Mechanical Analysis (DMA), a technique used in the field of thermal and materials engineering.<\/p>\n","protected":false},"author":4,"featured_media":9539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9535","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/posts\/9535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/comments?post=9535"}],"version-history":[{"count":3,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/posts\/9535\/revisions"}],"predecessor-version":[{"id":9554,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/posts\/9535\/revisions\/9554"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/media\/9539"}],"wp:attachment":[{"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/media?parent=9535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/categories?post=9535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tec-eurolab.com\/en\/wp-json\/wp\/v2\/tags?post=9535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}