Glass transition

Determination of the gel-point of a resin via DMA testing and its use in a practical sense The DMA is used to determine the modulus values of the resin to associated temperatures and frequencies. The state of viscosity of the resin is also monitored through the evaluation of tan delta values. Gel-point of a resin implies that resin matrix has transformed into an elastic gel state and can no longer flow. The viscosity shows a sudden rise to extremely high values. The time at which this state is detected marks the onset of gelation of the resin. Gel-point essentially is at the crossover of storage modulus and loss modulus since the value of storage modulus increases due to transition from fluid to a rather solid-like elastic state. [5] Use of…

bubbles had formed on the zinc. Zinc was then tested in the weak base NaOH with no observable reaction. The second element (A2) tested was an unknown element from Group 1. The density was calculated by measuring the mass and volume of one piece of the element and came out to be 0.12g/mL. The hardness of the element was 5.5 (the hardness of glass) based on the Mohs Hardness Scale. No magnetic attraction was observed when in contact with a magnet. The element was in an oil and the color of the…

INTRODUCTION Have you ever observed the interaction of two people and based on their body language you arrived at the conclusion that they may have been divorced for a year, remarried two years later, and on the verge of another divorce? Ok, that may be a little too detailed and you have keen observation skills, but what about observing one individual? These are some of the times that we bring out our Sociological Imagination which is the ability to see our personal lives in the context of the…

program would be encouraged to dig deep, pinpointing core issues within that have affected them negatively leading them to the path as to where they are. This process will allow the individual to go through a healing process, thus facilitating inner growth. We will ask participants to look at themselves through group therapy sessions, individual counseling, mentoring, pre and post self-assessments, and progressive goal setting. During this phase, they will also have the opportunity to reconcile…

Pre-Lab Questions 1. What are the steps of the scientific method? Briefly explain each. • The steps of the scientific method are observation, define problem, construct a hypothesis, test the experiment/ gather evidence, and draw a conclusion. Observation is the procedure of collecting information about events and processes carefully. It involves with seeing and hearing. Defining the problem is when you identify a conflict that requires a solution to be solved. A hypothesis is a proposed…

laid out the introduction, and I covered all of the main points I wanted to. The introduction was my favorite part of the speech, during the introduction I did a good job scanning the audience and my voice did not shake, I almost seem confident through that part of the speech. The only thing I would change is that I would pick a different attention getter, because the video clip I chose did not seem to draw the audience in the way it was meant to. I believe that my speech flowed well it was very…

Compared to the straight optimization of a non-transition state system to a ground state, transition states are more numerically sensitive and take more time to calculate. To achieve this level of accuracy, we continuously modified second derivative (force constants and frequencies) calculation criteria, which was either calculated initially by Gaussian and then approximated in further steps (Opt=CalcFC), or re-calculated at each step (Opt=CalcAll). Approximating the force constants was usually…

Observation Summary I enter room 105 which is a three year old room, I took a seat near the corner of the room, next I begin my observation I observe a teacher and three children playing with some small beads and strings, the teachers being to introduce the beads to the children, she engaged them in a conversation about the different color beads and the different sizes of the beads as well as the shapes of the beads, she looked over and notice one child who was stringing the beads and said,…

material used on the slats. For instance, one can change the slats from glass to wood to aluminum or whichever material one desires. These types of windows are easier to change the appearance than full pane type. Jalousie windows cannot be opened from outside once closed. Jalousie windows can remain open during rains since the glass protrudes outside and prevent most of the water from getting inside the house. One can easily enjoy the storm breeze without soaking surfaces around the window. They…

stained glass they produced. Their daily life was somewhat similar to other peasants in their community because they wore the same clothes and they ate the same food. On the other hand, the glazier would travel and live in workshops instead of staying in one area like other peasants. Furthermore, the glazier had a challenging job because of how stained glass was created, the tools that was used for stained glass, and the training the glazier they had to finish. Lastly, the glazier’s magnificent…