Of recent I’ve been trying to analyze some FT-IR spectra for my research on plasma and have been facing trouble trying to figure out which peaks correspond to what groups.
Luckily I came across this great tool which lists possible bonds that correspond with wave numbers which you can enter. It even has an option to perform a comprehensive search if you’re looking for a broader range of possibilities.
Want to study surface analysis? Here’s an excellent forum with details on techniques along with some very nice tutorials.
And I hope you all feel fine. Word is that my paper was enjoyed by most of the candidates. Students have performed such that I have had to award marks ranging from 9-37/40.
Polyester Technology
polyester-technology: Slides from presentation by Mr. Zainul Abideen, SDM (Product Development), Gatron Industries
Electrospinning
In the electrospinning process a high voltage is used to create an electrically charged jet of polymer solution or melt, which dries or solidifies to leave a polymer fiber. One electrode is placed into the spinning solution/melt and the other attached to a collector. Electric field is subjected to the end of a capillary tube that contains the polymer fluid held by its surface tension. This induces a charge on the surface of the liquid. Mutual charge repulsion causes a force directly opposite to the surface tension. As the intensity of the electric field is increased, the hemispherical surface of the fluid at the tip of the capillary tube elongates to form a conical shape known as the Taylor cone. With increasing field, a critical value is attained when the repulsive electrostatic force overcomes the surface tension and a charged jet of fluid is ejected from the tip of the Taylor cone. The discharged polymer solution jet undergoes a whipping process wherein the solvent evaporates, leaving behind a charged polymer fiber, which lays itself randomly on a grounded collecting metal screen. In the case of the melt the discharged jet solidifies when it travels in the air and is collected on the grounded metal screen. [http://www.che.vt.edu/Wilkes/electrospinning/electrspinning.html]
Note: To avoid confusion ignore the figure on electrospinning from the above source. Instead, here is a link to a better, and more easy to understand diagram.
Spider Silk
Here’s a link to the youtube video we saw and discussed in class showing the spinning of spider silk from the milk of genetically modified goats.
Ok so here they are. The last few remaining notes and handouts for this course.
I’m posting the material on proteinic fibres, synthetic fibres and fibres for technical textiles. Here are the slides we discussed in class along with the primary reference source to study from to understand the transitions that would otherwise look like jargon to those who weren’t there in class. (more…)
Here you are. I’ll add my observations to this post in a while.
Time now to look at cotton along with other forms of regenerated cellulosic fibres which we discussed in class that include, Viscose Rayon, High Wet Modulus Viscose (Modal) and Lyocell. (more…)
Finally… I’ve managed to put something together to post online for you people to go through. Although I’ve been telling in class time and again which pages from which book need to be referred to, here’s a more elaborate description of what needs to be studied. (more…)
After much discussion and lots of feedback here’s your term project.TEXT 321, Term Project
First Class Test, Model Answers
It is difficult to make so called conceptual papers because minor discrepancies with words can lead to misunderstandings. I’ve been analyzing answers and reviewing my paper in light of which I have redefined some of the answers in the paper.
Question 1.iii. Some candidates have misunderstood that they were just required to show lateral forces between 2 chains of Nylon 6.6. in this question and have involved water molecules in their answer. Although it was stated in the question that they were just required to use the particular type of bond they had specified in the first section of this question it could have been misunderstood to draw that the water molecule was required. Candidates who have correctly shown the interaction with the involvement of a water molecule will be given full credit for their answers.
Question 2.iv. The first choice, stating that the fibre would be too stiff to be used as a textile fibre is not true because the fibre can indeed be used as a composite or, with the scope of textiles expanding into a variety of technical uses, come into use to achieve never before possible architectural feats. Do you know that the curved wall of the Burj-al-Arab is made of fabric?
Comments are still welcome!
