Experiment § Are there air bubbles in the soil filling of the bicycle?
A bicycle customer reported to us that when our soil was applied to the composite material, there were many air bubbles on the surface after heating and hardening (Figure 1). There are many possible reasons: 1. Our filling soil has tiny air bubbles, which expand and become larger during the baking process. 2. The surface of the composite material itself is porous, and the air in these gaps runs into the filling soil to cause air bubbles. To judge where the reason is, we put the filling soil between two pieces of glass to heat. The gap is controlled at 2mm and observed whether there are air bubbles before and after hardening. Glass is chosen because the surface is flat, inert, does not react unexpectedly with the resin (Figure 1) (Figure 2), and can be used to reflect the properties of the resin itself. From the upper picture of Figure 2, our filling soil itself contains air bubbles. If we strengthen the defoaming of our filling soil, the problem of air bubbles can be completely solved (the lower picture of Figure 2). In some cases, the material's surface is porous, or the material absorbs moisture, so bubbles are generated during the baking process, rather than the resin itself containing bubbles. When the latter happens, the resin is placed between two pieces of glass and heated to harden without creating air bubbles. The small two pieces of glass are of great help to the problem.
Character § Put down your body and break the road to success in life!
Ms. Miao-ling, Lin, specialty: photo hardening resin - different substrates such as glass, metal, plastic, etc.; laboratory: Lab-2. Motto: Everything is spontaneous, and success will be on your side. [Teaching is another process of seeking knowledge and understanding] Since I failed the college entrance examination, I have always hoped to make a breakthrough in the postgraduate examination. So during the four years of college, I studied hard and finished second in the department graduated with high grades. God finally gave me a great opportunity. In 1994, I was admitted to the Polymer Research Department of the Institute of Chemical Engineering, Chiao Tung University, and found an outstanding professor. I became attached to polymers in just two years of my research career. At that time, I often opened the dormitory door at 2 am and woke up my sleeping roommates. Now I look back on it with satisfaction because the previous experimental skills are used in the current research and development work; I feel more familiarity and kindness. I have always thought that I am not a qualified and intelligent person. Still, often when faced with bottlenecks and difficulties, I always get inspiration from inadvertent and accidental hard work for a long time. This joy has made me unable to let go for a long time. [Life process] In my previous job at Everwide, I was a natural science teacher. I took education credits during the day and set up a children's laboratory to teach children scientific knowledge and experimental skills at night. He taught physics and chemistry courses in middle schools in the next two years. He was injured because of the long-term use of vocal cords. At the same time, Everwide Chemical's senior Ming-xu, Li needed R&D personnel, so he stopped teaching and engaged in R&D at Everwide Chemical. It has been 6 years. [Spiritual Growth] In these 6 years, which is not a short period, I have to admit that the nature of research and development work is very different from that of teaching. From not understanding light-hardening resin to making a glass adhesive one night and being happy with insomnia, from making the resin yellow and foggy to clear and transparent, from extremely poor to excellent ring test results. After many failures and trials, I think that as long as you persevere, you will often gain something. [You can learn more by emptying it] "When the bottle is full of water, you can't add water." Miao-ling, Lin talked about continuous learning in the field of chemistry. In terms of personal learning attitude, even a chemistry expert should not fill himself up to continuously improve their technology. [Future Outlook] When the family and work are competing and balancing, I hope that I am also a dedicated mother. I will leave time for my family during the holidays to exercise more to keep my body healthy; as long as I try my best, everything will be beautiful.
─Author: Ms. Shu-ping, Zhang, R&D Assistant Engineer, Everwide Chemical
Knowledge § How to measure thermal conductivity?
Fig. 3 Fig. 4 Fig. 5
The testing instrument used by our company is QuickLine-10, produced by Anter Corporation of the United States (as shown in Figure 3). The thermal conductivity is measured according to ASTM E1530. The measurement principle is between two polished metal surfaces at different temperatures. The metal contact plane in the lower half is part of the heat flow sensor, and a vertical temperature gradient exists in the system, as mentioned earlier, as the heat flows from the upper half-plane through the sample to the lower half-plane. By measuring the thickness of the sample, the temperature difference across the sample, and the heat flux detected by the heat flow sensor, the sample's thermal conductivity is determined. Figure 4 shows the actual measurement situation, and Figure 5 shows the measurement principle of ASTM E1530.
