Chapter 89: Group meeting

　　 After dinner, the two returned to the Microelectronics Building.
　　 Chen Wanqing lay on the sofa and asked:
　　 "Brother, do you have any suggestions for improvement regarding the polymerization reaction we did?"
　　 Xu Qiu recalled the experience summarized in the high-level teaching yesterday, and said:
　　"The problem of air tightness can be solved with vacuum silicone grease.
　　 In addition, I think you can refer to the deaeration method of the vapor deposition chamber. When vacuuming, blowing the glass wall with a hot blower can effectively remove the adsorbed oxygen. "
　　 "Hot the hair dryer? You can try it," Chen Wanqing said:
　　 "By the way, you said that we should put more solvent in the next reaction, so that it won't evaporate."
　　 Senior sister, this is jumping into the pit by herself, Xu Qiu said hurriedly:
　　 "No, I don't think you can use more solvents, but also less.
　　 This time, the solvent evaporates only because of the problem of airtightness. You can't waste food because of choking.
　　 The more the amount of solvent, the lower the monomer concentration, the slower the polymerization reaction speed, and the longer the reaction time, which may increase the probability of side reactions and decrease the catalyst activity. "
　　 "It seems reasonable," Chen Wanqing hesitated for a while and said:
　　 "It's up to you, this time we add a little less solvent to try the effect."
　　……
　　 After half an hour of rest.
　　 "I plan to vote again yesterday's reaction, how about you?" Chen Wanqing said.
　　 "Me too, so it's better to compare the difference between the two products." Xu Qiu said.
　　 The re-vaporized toluene and the dried glass apparatus are ready, and the two of them conduct experiments on their own.
　　 Set up a reaction device.
　　 Weigh the monomers, as yesterday, it adds up to a total of about 160 mg.
　　 Add toluene solvent, about 8 ml, first blow the glass wall with a hot blower, and then perform pumping and exhaust operations, repeat three times.
　　Add the catalyst and complete the pumping and exhausting operations again.
　　 Set the temperature of the oil bath to 120 degrees Celsius, start stirring, and turn on the condensate.
　　 Cover a layer of aluminum foil on the reaction vessel.
After 　　 was finished, Xu Qiu glanced at the progress of the senior sister.
　　 She has just weighed the monomer and is preparing to perform deoxygenation operation.
　　Looking at her, she was planning to control the three-way valve while holding a hot hair dryer.
　　 With this one mind and two uses, it is easy to cause problems.
　　 Because after the low vacuum signal appeared in the reaction vessel, there was only less than one second of reaction time, so close the three-way valve.
　　 If it is turned off early, the effect of deoxygenation is not satisfactory. If it is turned off late, the solution will be sucked away by the vacuum pump.
　　 He did not believe in the experimental ability of the senior sister, so he said:
　　 "Senior sister, wait a minute, let me help you operate the hot hair dryer."
　　 "Your response is over?" Chen Wanqing looked at the fume hood next to her, and said:
　　 "Okay, then you can help me, I am also a little afraid of the solvent being taken away."
　　……
　　 Chen Wanqing finished the reaction, looked at the time, and said:
　　"Finally, I hope this response will be smoother.
　　 There is still some time, let's simply dispose of the dirty bottles and put them in the alkali tank. "
　　 Xu Qiu nodded and collected the dirty bottles from the last reaction.
　　 First use a brush to remove the attachments on the inner wall of the bottle, then use tweezers to clamp the bottle with the mouth of the bottle facing up, and slowly press it under the alkali tank to fill them with the lye in the alkali tank.
　　 Of course, Xu Qiu is very careful in this process. After all, if the splashed liquid accidentally gets on the skin, it is estimated that it will peel off.
　　 After dinner, the two took the school bus back to Handan campus.
　　……
　　 The class meeting at 7 pm.
　　 There was a traffic jam on the road. When Xu Qiu arrived at the meeting place, the meeting room was already full of people.
　　Counselor Yu Qiang stood on the podium, looked at his watch, then glanced at the classmates sitting below, and said:
　　 "It's almost time, let's start."
　　 "This year, all my classmates are in their senior year. I know that everyone's time is precious, and there may be all kinds of things to be busy.
　　 But I still called everyone together, mainly because there are a few important things that I want to talk to you, we try to be as long as possible.
　　 The first thing is about the postgraduate program. Now the list of candidates for admission has come out. I sent all the students who signed up for the postgraduate program by email.
　　 This list is also publicized on the first floor, second floor, and advanced materials building of our department of materials.
　　 Please log on to the recommended student website to check the information on the Internet. If the materials are not enough for direct postgraduate students, please fill in the materials in time.
　　 If there is no problem with the information, click on the website to confirm the research and sign the letter of commitment.
　　 I want to emphasize that after signing the letter of commitment, the school will close your permission to print your Chinese and English transcripts, and will not be able to issue a three-party labor contract afterwards.
　　 The reason, everyone should understand. "
　　 Xu Qiu muttered to himself:
　　 The school is afraid that the graduate students will run away. If they can’t print their transcripts, they can’t apply abroad, they can’t open tripartites, and it’s not easy to find a job. This is a salary draw.
　　 But it is also normal. Once the list is confirmed, if someone gives up the undergraduate program, then the quota he occupied will be wasted and the department will recruit one less graduate student.
　　 There is nothing wrong with the department.
　　 Just like when he had two roommates in his freshman year, he actually only had one.
　　 Because another roommate dropped out and went to Hong Kong University, the school missed one undergraduate.
　　 "The second thing is about the change of class cadres. Since our sophomores joined the big family of the Department of Materials, we will re-elect class cadres every year, and this year is no exception..."
　　 Select class cadres once a year~EbookFREE.me~ mainly to allow more students to have student work experience.
　　 This way, when they graduate and look for a job, they can add a little bit to their resume. Although it may not be much, it is better than nothing.
　　 Suddenly, Xu Qiu felt someone poking him with paper behind him.
　　 Looking back, it was Yi Sijia, who was in front of him in the interview with the graduate student, holding a sign-in form in her hand.
　　 He nodded, took the sign-in form, signed himself, and also helped his roommate Ren Bin sign in.
　　 The counselor had previously announced the content of the class meeting in the email. Ren Bin felt that he had nothing to do with him, so he asked Xu Qiu to sign in for him.
　　 "This time the election of class leaders adopts a distribution system, giving priority to those students who are facing job hunting. If you have been a class leader before, let the opportunity be given to other students.
　　 Students who are interested, stay after the class meeting to discuss the issue of job assignment. "
　　 The third thing is the question of graduation. For those students who have missed courses in their professional courses, have less than 120 credits, or have less than 2.0 grade points, the last two semesters may have to hurry up.
　　 If these three standards are not met before graduation, it will affect the issuance of degree certificates.
　　The two certificates are not complete, it will affect the job search..."
　　 Now universities are basically wide in and wide out, and the threshold for graduation requirements is set very low.
　　 But Xu Qiu had heard that someone had studied undergraduate for eight years, but failed to meet the graduation requirements, and was eventually forced to drop out of school.
　　Because the upper limit of the undergraduate postponement of Madu Comprehensive University is eight years.
　　 "The last thing is about employment..." Yu Qiang continued to talk on the podium.
　　 In the end, the class meeting lasted for nearly two hours.
　　 What about a long story short?