Designation:D4440-15 INTERNATIONAL Standard Test Method for Plastics:Dynamic Mechanical Properties Melt Rheology This standard is issued under the fixed designation D4440; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope* observed data, reporting in full (as described in this test 1.1 This test method outlines the use of dynamic mechanical method) the conditions under which the data was obtained may enable apparent differences observed in another study to be instrumentation in determining and reporting the rheological reconciled. properties of thermoplastic resins and other types of molten polymers. It may be used as a method for determining the 1.7 Test data obtained by this test method are relevant and complex viscosity and other significant viscoelastic character- appropriate for use in engineering design. istics of such materials as a function of frequency, strain 1.8 The values stated in SI units are to be regarded as the amplitude, temperature, and time. Such properties may be standard. The values given in parentheses are for information influenced by fillers and other additives. only. 1.2 It incorporates a laboratory test method for determining 1.9 This standard does not purport to address all of the the relevant rheological properties of a polymer melt subjected safetyconcerns,if any,associated with its use.It isthe to various oscillatory deformations on an instrument of the type responsibility of theuser of this standard to establish appro- commonly referred to as a mechanical or dynamic spectrom- priate safety and health practices and determine the applica eter. bility of regulatory limitations prior to use. 1.3 This test method is intended to provide a means of NorE 1—This test method is equivalent to ISO 6721, Part 10. determining the rheological properties of molten polymers, such as thermoplastics and thermoplastic elastomers over a 2.Referenced Documents range of temperaturesbynonresonant,forced-vibration tech- niques. Plots of modulus, viscosity, and tan delta as a function 2.1 ASTM Standards:2 of dynamicoscillation(frequency),strain amplitude. D4000 Classification System for Specifying Plastic Materi temperature, and time are indicative of the viscoelastic prop als erties of a molten polymer. D4065 Practice for Plastics: Dynamic Mechanical Proper ties: Determination and Report of Procedures 1.4 This test method is valid for a wide range of frequencies, D4092 Terminology for Plastics: Dynamic Mechanical typically from 0.01 to 100 Hz. Properties 1.5 This test method is intended for homogenous and E691 Practice for Conducting an Interlaboratory Study to heterogeneous molten polymeric systems and composite for- Determine the Precision of a Test Method mulations containingchemical additives,including fillers 2.2 ISO Standard:3 reinforcements, stabilizers, plasticizers, flame retardants, im- ISO 6721, Part 10 Plastics—Determination of Dynamic pact modifiers, processing aids, and other important chemical Mechanical Properties, Part 10, Complex Shear Viscosity additives often incorporated into a polymeric system for Using a Parallel-Plate Oscillatory Rheometer specific functional properties, and which could affect the processability and functional performance. These polymeric 3. Terminology material systems have molten viscosities typically less than 106 Pa-s (10’ poise). 3.1 Definitions—Definitions are in accordance with Termi- 1.6 Apparent discrepancies may arise in results obtained nology Standard D4092. under differing experimental conditions. Without changing the 2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or 1 This test method is under the jurisdiction of ASTM Committee D20 on Plastics contact ASTM Customcr Service at scrvice@a