Niloofar Afshari

7 Questions 6 Answers 0 Followers

Questions related from Niloofar Afshari

How do I prevent PVC powder from clumping in DOP?

I'm attempting to make some PVC films in a hot press using DOP and PVC powder (itself mixed with powder additives) as ingredients. I tried mixing DOP and PVC at a 50:50 ratio (w/w) by adding all...

08 October 2024 8,396 0 View

How does one prevent rPVC pellets from sticking together after they are cut in a die-face air cooling pelletizer?

We are recylcling rPVC with a proprietary formulation that, among other things, contains DOP and wax. The pellets immediately stick together when they are cut by the cutter and form a string...

25 September 2024 1,805 5 View

How do I add a categoric factor to my mixture DOE design in Design Expert 13 (or alternatively set the sum in an RSM design equal to a constant)?

Factors: 3 numeric factors 2 categoric factors Goal: I want to have a design where the values of my numeric factors always sum to a constant value (for example A+B+C = 100, where A, B, and C are...

12 August 2024 2,197 1 View

Why am I seeing only one initial maximum in torque-time curves for the fusion of PVC in a Brabender?

We're studying the stability and fusion behavior of multiple PVC compounds in a Brabender. After a few trials, we set the temperature at 195 °C and the rotor speed at 70 rpm. Samples differ in...

13 July 2024 3,014 1 View

What is the most efficient method to determine the functionalities on a silane-treated glass surface?

We have recorded the FT-IR spectrum of silane-treated* glass fibers that we bought from a supplier and wish to determine the functionalities on the surface of our glass fibers using the FT-IR data...

05 March 2024 2,358 1 View

What is the concentration of the phenol solution and the solvent used to dissolve it in measuring the intrinsic viscosity of PET with a viscometer?

I'm trying to prepare the solvent for use in measuring the intrinsic viscosity of PET with a glass capillary viscometer. The relevant ASTM standard (D4603 – 03) specifies a 60/40 wt/wt% solution...

05 December 2023 4,804 1 View

What factors could cause both storage and loss moduli to rise during a strain sweep measurement?

Strain amplitude sweeps are standard rheological measurements to determine a polymer's linear viscoelastic region. My system of interest is a filled, reactive thermoplastic polymer.

30 November 2023 1,128 5 View