BS ISO 19935-2:2020 pdf download – Plastics — Temperature modulated DSC Part 2: Measurement of specific heat capacity c p This document establishes a method for measurement of specific heat capacity, c p , using temperature modulated differential scanning calorimetry. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 472, Plastics — Vocabulary ISO 11357‑1, Plastics — Differential scanning calorimetry (DSC) — Part 1: General principles ISO 19935‑1, Plastics — Temperature modulated DSC — Part 1: General principles ISO 80000‑5, Quantities and units — Part 5: Thermodynamics 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 472, ISO 11357‑1, ISO 19935‑1 and ISO 80000‑5 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Symbols and abbreviated terms 4.1 Temperature modulation, T(t) According to ISO 19935‑1. 4.2 Scanning rate According to ISO 19935‑1. 4.3 Heat flow rate, Φ(t) According to ISO 19935‑1. b) Depending on the relation of the underlying scanning rate β 0 to the amplitude of sample temperature profile T A ω (where ω the angular frequency) four cases of scanning rates are distinguished. 1) Quasi–isothermal mode, β 0 = 0. If β 0 = 0, heat capacity can be measured as function of time,e.g. during chemical reactions like curing or during crystallization. All other calorimetric methods measure heat capacity as function of temperature only. 2) For other modes, such as T A ω > β 0 , T A ω < β 0 , and T A ω = β 0 , refer to ISO 19935‑1. c) Any mode of temperature modulation specified in ISO 19935‑1 can be used. 7 Calibration 7.1 General According to ISO 19935‑1. 7.2 Calibration of modulation amplitude According to ISO 19935‑1. 7.3 Calibration of phase According to ISO 19935‑1. 8 Procedure 8.1 General The procedures of temperature modulated DSC (setting up the apparatus, loading the specimen into the crucibles, insertion of crucibles into the instrument, performing measurements, and removal of crucibles) shall be in accordance with ISO 11357‑1. The experimental conditions specified...
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