Chapter 101: Introspection

　　 After lunch, take a short break and continue the experiment.
　　 Set up the Soxhlet extraction device, use methanol, acetone, and n-hexane to clean the third batch of synthesized products.
　　While waiting, he brushed the dirty bottles this time with a brush and put them in the alkali tank.
　　 Then re-evaporate the toluene.
　　 vote for the fourth batch of reactions.
　　Because the 2FBT monomer with 22 or 26 carbon atoms side chain, the order has just been placed online, and it will take a few days to arrive.
　　 Therefore, Xu Qiu can only test the water with the existing 18 carbon atoms and 2HD side chain monomer.
"The target synthetic product is P2FBT4T-2HD.
　　 Through continuous adjustment and optimization, the molecular name has changed from the original PBT4T to a long string, P2FBT4T-2HD.
　　 No wonder some people choose to name them like X1 and X2, which saves a lot of trouble.
　　 Chen Wanqing also made a supplementary vote, which was the 3:7 ratio that failed last time.
　　……
　　 After the two completed all experiments, it was already seven o'clock in the evening.
　　 After dinner, Chen Wanqing took the school bus and returned to the Handan campus.
　　 Xu Qiu estimated that the fourth batch of polymerization will be shut down at around 7:00 tomorrow morning, and the third batch of Soxhlet extraction will be completed, and there will be a lot of things waiting for him afterwards, such as chloroform extraction.
　　 Do you want to stay in Zhangjiang for another night?
　　Only, tomorrow is Wednesday, and there is a professional degree course in Nanomaterials in the morning.
　　 However, this course is said to be not difficult, and the impact of skipping a class should not be big.
　　Moreover, in the first two weeks of Mordu University, students can withdraw and choose courses freely, so the list of students is uncertain, and teachers usually do not roll their names.
　　 Actually, the proportion of teachers who can call is not much, probably less than 20%.
　　 Most of them are concentrated in liberal arts courses, and the teachers of science and engineering courses are rarely famous.
　　 For teachers of science and engineering, the teaching task is only to complete the rigid requirements set by the school.
　　Most teachers' work focuses on scientific research, because the teaching status has little to do with their evaluation of professional titles, promotion, and funding projects. These aspects are more about scientific research output.
　　 Of course, personal connections are also a very important consideration.
　　 However, unless the relationship is connected to the sky, connections can only be the icing on the cake.
　　Without strong scientific research capabilities, many people may stay as associate professors for the rest of their lives.
　　 Various reasons have caused many teachers to read PPT in class, and his students may have done the PPT for him.
　　The final exam will also choose the form of speech instead of written exam.
　　 This can save energy and devote more time to scientific research or to engage in interpersonal relationships.
　　 Therefore, for students, there is not much that can be learned in most courses. In most cases, they need to learn independently.
　　……
　　 After comprehensive consideration, Xu Qiu decided to stay overnight at Zhangjiang campus again.
　　 At night, he received a new WeChat message on his mobile phone. It was the bedroom group of him and two roommates.
　　 Tao Yan sent four messages in succession:
　　 "@许秋, how about you?"
　　 "I haven't returned to the bedroom for two days"
　　 "I didn't have the frequency like you before."
　　 "You must pay attention to safety when you are outside"
　　 Xu Qiu: "I'm in Zhangjiang, I just finished the experiment"
　　 Tao Yan: "Okay, I thought you went outside to KF"
　　 Xu Qiu: "……"
　　 This guy is really speechless.
　　……
the next morning.
　　 After Xu Qiu got up, he went directly to the laboratory.
　　 He first checked the fourth batch of reactions.
　　 There are two reactions in total, and the senpai’s is relatively normal, similar to the other two systems she did before.
　　 And in Xu Qiu's reaction flask, not much solid product precipitates out. The high probability is because the branch chain length is increased, which effectively improves the solubility of the product.
　　 However, we cannot simply draw conclusions.
　　 Because the possibility that the experiment has not been done well cannot be ruled out, such as the wrong material ratio, resulting in the low molecular weight of the product, similar situations will also occur.
　　The material performance is good or bad, it is still necessary to make photovoltaic devices before the final conclusion can be made.
　　 Xu Qiu shut down the two reactions and started the capping reaction.
　　At this time, the Soxhlet extraction of the third batch of reactions has basically ended.
　　 estimated the time, Xu Qiu found that when the molecular weight of the product is relatively high, it is not necessary to perform a 24-hour Soxhlet extraction with a mixed solvent to purify them.
　　 However, unlike the polymerization reaction, the Soxhlet extraction time is extended from 12 hours to 24 hours, which has little effect on the performance of the product, but it will waste time.
　　 The third batch of products was taken out, and after roughly drying, Xu Qiu took out the chloroform solvent recovered last time and prepared to extract with chloroform.
　　 There are exactly four groups of products, and each group can dispense about 200 ml of chloroform.
　　The loss of Soxhlet extraction solvent with chloroform is relatively small.
　　 If the loss is large, it means that a large amount of solvent volatilized into the air, which may cause the experimenter to be poisoned.
　　 After all, matter can't disappear for no reason.
　　 After the last experiment, Xu Qiu showed no signs of chloroform poisoning shown in the MSDS, nor did he feel unwell.
　　 It seems that as long as the protection is in place, the risk of using chloroform for Soxhlet extraction is actually not high.
　　……
　　 Chen Wanqing arrived at the laboratory at about ten o'clock, just like yesterday.
　　 "Is the experiment going well?"
　　 "In the fourth batch of reactions, both of us look good. The third batch of reaction products will need to be extracted with chloroform Soxhlet. I have set up the equipment for you." Xu Qiu said.
　　 "Okay, I will operate this time." Chen Wanqing said.
　　 Xu Qiu was a little worried about her experimental ability, did not leave, and stood by onlookers.
　　 was successfully completed without any accidents.
　　 He found that when the senior sister did experiments, although various minor problems always appeared, UU reading www.uukanshu.com, but major safety issues, never appeared.
After 　　, the two of them dripped the third batch of products extracted with chloroform into methanol again.
　　The product precipitates, the product is dried, and the product is weighed.
　　 Xu Qiu’s two products, the yield of PBT4T is about 80 mg, which is higher than the yield of the second batch.
　　 While P2FBT4T-2BO is only 30 mg, the yield is terrible, less than 20%.
　　 Because a large amount of insoluble products are left in the filter paper, they cannot be extracted by chloroform.
Both batches of 　　 Chen Wanqing's products are not bad, and the yield is about 60%.
　　Finally, the two of them roughed up the fourth batch of products, set up a Soxhlet extraction device, and washed them with three mixed solvents.
　　 is another busy day.
　　 After completing all the experiments, it was past eight o'clock in the evening, and I could only catch the last school bus.
　　 Fortunately, there is no new response today, so there is no need to shut down the response on the next morning.
　　 He can finally return to the Handan campus.
　　……
　　 Back to the bedroom, Xu Qiu found that the other two roommates were there.
　　 Ren Bin is still sitting at the computer and playing games as usual, while Tao Yan is playing with SWITCH on the bed.
　　 After these two people showed their strength at the end of last semester, they both slack off again this semester.
　　Think about it, the lives of the two of them will be basically determined in the next few years. One is to return to school after two years of baccalaureate study, and the other is to go to graduate school for three years. Naturally, there is not much tension.
　　 Xu Qiu saw the two of them and thought about herself again.
　　 Working so hard to do scientific research is harder than 996. I haven't got a high salary yet, and I can only get a 1,000 yuan subsidy from Teacher Wei every month.
What is 　　 for?