What is "Degree of Crystallinity" - Definition & Explanation
Last Updated on: 04-Mar-2023 (11 months, 21 days ago)
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Degree of Crystallinity

The degree of crystallinity is a crucial parameter used in the textile industry to measure the level of crystalline structure present in a polymer material, particularly in fibers and films. It quantifies the extent to which the polymer chains are arranged in an ordered, repeating pattern, forming crystalline regions within the material. The degree of crystallinity significantly influences the mechanical, thermal, and optical properties of textile materials.

History and Origin

The concept of crystallinity in polymers originated in the early 20th century with the groundbreaking work of researchers such as Hermann Staudinger and Paul Flory. Staudinger's studies on polymer chains and their structural arrangement laid the foundation for understanding the crystalline and amorphous regions within polymeric materials. Over the years, advancements in analytical techniques, such as X-ray diffraction and infrared spectroscopy, have enabled accurate measurements and characterization of the degree of crystallinity in textiles.

Types of Degree of Crystallinity

There are two primary types of degree of crystallinity:

  1. True Crystallinity: True crystallinity represents the proportion of crystalline regions within a material, expressed as a percentage. It is determined by analyzing the X-ray diffraction pattern or other appropriate techniques. True crystallinity values can range from 0% (completely amorphous) to 100% (fully crystalline).
  2. Apparent Crystallinity: Apparent crystallinity considers both crystalline and amorphous regions within a material. It represents the percentage of crystalline material in relation to the total mass of the sample, including both crystalline and amorphous phases.

Tips in Handling Degree of Crystallinity

When dealing with the degree of crystallinity in textiles, it is essential to consider the following tips:

  • Accurate Measurement Techniques: Utilize reliable analytical techniques such as X-ray diffraction, differential scanning calorimetry, or infrared spectroscopy to determine the degree of crystallinity accurately.
  • Sample Preparation: Ensure proper sample preparation, including controlled drying and conditioning, to minimize the impact of environmental factors on the degree of crystallinity measurements.
  • Multiple Characterization Methods: Employ multiple characterization methods to cross-validate the degree of crystallinity results and obtain a comprehensive understanding of the material's structure.
  • Consider Material Factors: Recognize that the degree of crystallinity can be influenced by various factors, including polymer type, processing conditions, cooling rate, and post-treatment methods.
  • Correlation with Properties: Establish correlations between the degree of crystallinity and material properties such as strength, stiffness, thermal stability, and optical clarity to guide material selection and optimization.

Top International Users and Manufacturers

The degree of crystallinity has significant implications in various industries, including textiles. Several international users and manufacturers focus on the development and application of high-performance materials with controlled crystallinity. Here are some notable examples:

  1. DuPont: DuPont, a leading global chemical company, extensively uses the degree of crystallinity as a fundamental parameter in developing advanced textile fibers and films for various applications.
  2. Teijin: Teijin, a Japanese chemical and pharmaceutical company, employs precise control of the degree of crystallinity in their polyester and aramid fibers to enhance mechanical properties and achieve specific functionalities.
  3. Toray Industries: Toray Industries, a multinational corporation based in Japan, focuses on high-performance fibers, films, and textiles, with the degree of crystallinity playing a crucial role in achieving desired material properties.
  4. Invista: Invista, a global producer of polymers and fibers, leverages an understanding of the degree of crystallinity to develop innovative textile materials, including their well-known brand, Lycra, which exhibits controlled elasticity and comfort.
  5. DSM: DSM, a Dutch multinational corporation, utilizes the degree of crystallinity as a key parameter in their high-performance fibers, films, and coatings, enabling advanced solutions in sectors such as automotive, medical, and protective textiles.
  6. Toray Carbon Fibers: Toray Carbon Fibers, a division of Toray Industries, focuses on carbon fiber production, where precise control of the degree of crystallinity is critical for achieving desired mechanical properties and structural integrity.


The degree of crystallinity plays a vital role in understanding the structure and properties of polymer materials used in textiles. Accurate measurement techniques and careful handling of the degree of crystallinity allow for precise control over material properties and performance. The international users and manufacturers mentioned above exemplify the significance of the degree of crystallinity in the development of advanced textile materials. As technology continues to advance, further insights into the degree of crystallinity will drive the creation of innovative textiles with tailored properties for diverse applications.

Degree of Crystallinity
The amount, expressed as a percentage by mass, or linear polymer that is generally present in a crystalline form, the remainder of the polymer being present in an amorphous state.
There are several methods used for the determination of the amount of crystalline polymer in a man-made fibre. The results obtained differ according to the method used, so comparisons should be limited to one method of measurement.

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