Steven Rich

6 Questions 4 Answers 0 Followers

Questions related from Steven Rich

How do I deal with static charge in contact angle measurements?

I am conducting contact angle measurements to find the surface energy of various substrates, but when I approach them to the water droplet, the droplet bridges between the needle and the substrate...

01 December 2021 7,265 4 View

How can I experimentally determine polymer relaxation time?

I am trying to compare the relaxation times of various polymer melts in order to analyze their melt fracture behavior. I have conducted stress relaxation (5% strain) tests as well as frequency...

16 March 2018 1,545 2 View

How can I calculate the heat of fusion of a semicrystalline polymer based off of a DSC plot?

I have run a DSC experiment on a copolymer of polypropylene and polyethylene, resulting in the following plot. In order to calculate the heat of fusion, I take the two starred points surrounding...

07 March 2017 1,041 7 View

What polymer has a glass transition around 40C?

I am looking for a polymer that softens significantly at this temperature. Although the Tg listed for nylon is around this temperature, I have observed very little softening, so I am looking for...

16 April 2016 8,230 6 View

Why can't I form sheets of nylon-12? What other polymers might be applicable?

I have pellets of Nylon-12, and I am looking to form flat sheets. The published glass transition temperature is 41C and the melting point is around 180C. I am putting ~1g of pellets in a heat...

15 April 2016 5,059 6 View

What does a positive slope mean in a DSC graph?

I am new to Differential Scanning Calorimetry and have been running some tests on a co-polymer filled with particles. I have run into some strange graph shapes that a couple of hours on Google...

16 March 2016 1,975 4 View