Molecular weight distribution of polyphenylene sulfide by high temperature gel permeation chromatography

Abstract

SynopsisPoly(pheny1ene sulfide) (PPS) has been characterized using a novel high temperature gel permeation chromatograph (GPC). Samples were injected in slurry form a t ambient temperature, and redissolved by an in-line precolumn heater at 250°C. A viscometer consisting of a capillary tube with inlet and outlet taps connected to a sensitive differential pressure transducer was used as sole detector, with deflections converted to concentration using the column calibration. Columns and viscometer were operated a t 210°C. Universal calibration was carried out using intrinsic viscosityimolecular weight relations for polystyrene and PPS, determined by light scattering. Satisfactory operation was confirmed by agreement between inirinsic viscosity calculated from GPC with independently measured values, and comparisons with melt flow data. Samples of PPS tested were found to be of relatively narrow distribution, with M J M , typically less than two.

Impact Strength and Crystallization Behavior of Nano‐SiOx/Poly(phenylene sulfide) (PPS) Composites with Heat‐Treated PPS

“…The solvent was 1-chloronaphtalene and the solution temperature was 208 8C; the concentration was 0.4 g/dl. The molecular weight was defined by: Z ¼ K(M a n ), where Z is the intrinsic viscosity number; K ¼ 8.9 Â 10 5 , a ¼ 0.747; [8] and M n is number-average molecular weight.…”

“…The sample was weighed after 48 h and the gel content calculated from the remainder's weight. [8] Crosslinking was measured by IR spectra (ANALECT-RFX-65A) using a thin film sample 25 mm thick.…”

Polyethersulfone (PES) and Its Processing

“…Certain assumptions [19][20][21], including the use of Fick's diffusion law [22,23], are made. The diffusion coefficients were obtained by minimizing the root-mean-square error between the experimentally measured pellet moisture.…”

A High Temperature Light Scattering; Molecular Weight Determination of Poly(phenylene sulphide)

“…They were dissolved in 1-chloronaphthalene at 230-240°C in the nitrogen atmosphere and cooled to room temperature to be colloidal solutions or slurries, which are used for LS measurements as explained below. 6 Their concentrations, which were calculated from the weights of the samples dissolved, were in the range of 0.1-0.5 % . Sample No.…”