ISO 1628-4:1999 pdf download – Plastics – Determination of the viscosity of polymers in dilute solution using capillary viscometers

03-01-2022 comment

ISO 1628-4:1999 pdf download – Plastics – Determination of the viscosity of polymers in dilute solution using capillary viscometers
1 Scope
This part of ISO 1 628 describes the conditions necessary for the determination of the viscosity number (also known as the reduced viscosity) and the relative viscosity of polycarbonates in dilute solution. It can be used for pure polycarbonates and blends with other polymers, as well as mixtures of both, with or without fillers, as defined in ISO 7391 -1 .
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 1 628. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 1 628 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 1 628-1 :1998, Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 1 : General principles.
ISO 31 05:1994, Glass capillary kinematic viscometers — Specifications and operating instructions.
ISO 4793:1 80, Laboratory sintered (fritted) filters — Porosity grading, classification and designation.
ISO 7391 -1 :1996, Plastics — Polycarbonate (PC) moulding and extrusion materials — Part 1 : Designation system and basis for specifications.
ISO 7391 -2:1996, Plastics — Polycarbonate (PC) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties.
6.4.1 Non-reinforced samples containing little or no pigment/additive
Using the analytical balance (5.5), weigh, to the nearest 0,1 mg, 500 mg of the test material into a 1 00 ml volumetric flask (5.4). Add approximately 70 ml of dichloromethane (6.1 ) and place on the shaker (5.1 1 ) until completely dissolved. Make up to the mark with dichloromethane at the calibration temperature, and shake once more to homogenize the solution. When testing materials containing small amounts of pigments and/or additives (see below), increase the mass of the sample in proportion to the amount of pigment or additive present so that the resulting concentration of pure polycarbonate is 5 g/l. NOTE 1 This correction is only necessary if the pigment and/or additive content is more than 1 %. Soluble dyes, pigments and/or additives at concentrations of less than 1 % will not affect the result of the determination. NOTE 2 Higher concentrations of pigments/additives or very intense dyes (preventing optical measurements using photo- electric cells) affect the measurement so much that these components must be removed from the test solution with the help of a filter aid (5.1 0) or centrifuge (5.1 2). The instructions given in 6.4.2 are applicable to the treatment of the sample in such cases. NOTE 3 When using an automatic viscometer with computerized control equipment [5.1 c)], the amount of polymer weighed out can differ from the set value by up to 1 0 %, as long as the polymer concentration, which will also differ from the set value, is taken into account when calculating the result [see A.3 c)].
6.4.2 Glass-fibre-reinforced samples and/or samples with high pigment/additive contents
Weigh approximately 5 g of the material under test into a 1 00 ml volumetric flask (5.4). Add approximately 70 ml of dichloromethane and place on the shaker until completely dissolved. The sample can be crushed mechanically before this step to increase the speed of dissolution.

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