Product Introduction:

Differential scanning calorimeter is a thermal analysis instrument that measures the relationship between the heat flux difference and temperature parameters between the reference end and the sample end. It is mainly used to measure various characteristic parameters during the heating or cooling process of substances, such as glass transition temperature Tg, oxidation induction period OIT, melting temperature, crystallization temperature, specific heat capacity, and enthalpy.

Main features:
1. A brand new furnace structure ensures resolution and baseline stability of resolution

2. Digital gas mass flow meter, controlling the flow rate of purging gas, with data directly recorded in the database
3. The instrument can adopt bidirectional control (host control, software control), with a friendly interface and easy operation

Technical Specifications:

The differential scanning calorimeter can perform the following test items:

Typical DSC test curve:

What is the glass transition temperature?

Glass transition is an inherent property of amorphous polymer materials (i.e. amorphous polymers), which is a macroscopic manifestation of the transformation of polymer motion forms. It directly affects the material's performance and processability, and has therefore been a major focus of polymer physics research for a long time.

The vast majority of polymer materials can typically exist in the following three physical states (or mechanical states):Glass state, high elasticity state (rubber state), and viscous flow stateAnd the glass transition isHigh elastic state and glassy stateFrom a molecular structure perspective, the glass transition temperature is a relaxation phenomenon of the amorphous part of a polymer from a frozen state to a thawed state.

Taking DSC as an example, as the temperature gradually increases and passes through the glass transition temperature of the polymer, the baseline on the DSC curve shifts towards the endothermic direction (see figure). The point A in the figure is the starting point of deviation from the baseline. Extend the baseline before and after the transformation, and the vertical distance between the two lines is the step difference Δ J. At Δ J/2, point C can be found. Take a tangent from point C and intersect with the previous baseline at point B. The temperature value corresponding to point B is the glass transition temperature Tg.

Common crystalline plastics include polyethylene PE, polypropylene PP, polyoxymethylene POM, polyamide PA6, polyamide PA66, PET, PBT, etc

Amorphous plastics include: polycarbonate ABS、 Transparent benzene, vinyl chloride, etc. (such as plastic watch cases, TV cases, etc.)

What is the oxidation induction period?

The oxidation induction period (OIT) is a measure of the time it takes for a sample to undergo an automatic catalytic oxidation reaction under high temperature (200 degrees Celsius) oxygen conditions. It is an indicator for evaluating the material's ability to resist thermal degradation during molding, storage, welding, and use. The oxidation induction period (OIT) method is a method that uses differential thermal analysis (DTA) to test the degree of accelerated aging of plastics in high-temperature oxygen based on the exothermic reaction of plastic molecular chain breakage. The principle is to place the plastic sample and an inert reference material (such as alumina) in a differential thermal analyzer, and rapidly replace the inert gas (such as nitrogen) in the sample chamber with oxygen at a certain temperature. Test the changes in DTA curve (differential thermal spectrum) caused by sample oxidation and obtain the oxidation induction period (time) OIT (min) to evaluate the thermal aging resistance of plastics.

Application examples of Hesheng differential scanning calorimeter in some research institutes of universities

Partial use of our differential scanning calorimeter customer SCI paper

1、Natural compounds from Punica granatum peel as multiple stabilizers for polyethylene

2、Electro-Thermochromic Luminescent Fibers Controlled by Self-Crystallinity Phase Change for Advanced Smart Textiles

3、Carbon fiber/polyetherketoneketone composites. Part I: An ideal and uniform composition via solution‐based processing

4、Isolation and characterization of acid-soluble collagen and pepsin-soluble collagen from the skin of hybrid sturgeon

5、Physicochemical properties of soybean-based diacylglycerol before and after dry fractionation.

6、Water-in-oil emulsions enriched with alpha-linolenic acid in diacylglycerol form: Stability, formation mechanism and in vitro digestion analysis

7、Effects of treatment methods on the formation of resistant starch in purple sweet potato

8、High Lithium Ion Flux of Integrated Organic Electrode/Solid Polymer Electrolyte from In Situ Polymerization

9、Preheat Compression Molding for Polyetherketoneketone: Effect of Molecular Mobility

10、Characterization and experimental investigation of aluminum nitride-based composite phase change materials for battery thermal management

11、Experimental investigation of the flame retardant and form-stable composite phase change materials for a power battery thermal management system

12、Experimental investigation on immersion liquid cooled battery thermal management system with phase change epoxy sealant

13、Experimental Investigation on Thermal Management of Electric Vehicle Battery Module with Paraffin/Expanded Graphite Composite Phase Change Material