I Have a Research Support System

After dinner, the two returned to the Microelectronics Building.

Chen Wanqing lay on the sofa and asked:

"Student, do you have any suggestions for improving the polymerization reaction we did?"

Xu Qiu recalled the experience he summed up during the advanced 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 deoxygenation method of the evaporation chamber. When vacuuming, use a hot blower to blow the glass instrument wall, which can effectively remove the adsorbed oxygen. "

"A hot 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 to dryness."

The senior is jumping into the pit by herself, Xu Qiu hurriedly said:

"No, I think that instead of adding more solvents, you should put less.

This time, it was only because of air tightness that the solvent evaporated to dryness, so we should not give up eating because of choking.

The larger the amount of solvent, the lower the monomer concentration, the slower the polymerization reaction, and the longer the reaction time may increase the probability of side reactions, and the catalyst activity will also decrease. "

"It seems to make sense," Chen Wanqing hesitated for a while, then said:

"Just listen to you, let's add a little less solvent this time to try the effect."

...

After resting for half an hour.

"I'm going to re-submit yesterday's response, how about you?" Chen Wanqing said.

"It's the same for me, so I can compare the difference between the two products." Xu Qiu said.

The re-distilled toluene and dried glass instruments were ready, and the two carried out experiments separately.

Set up the reaction device.

Weigh the monomers, the same as yesterday, adding up to a total of about 160 mg.

Add about 8 ml of toluene solvent, first blow the wall of the glass instrument with a hot blower, and then perform the pumping and exhausting operation, repeating 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 the reaction vessel with a layer of aluminum foil.

After finishing, Xu Qiu took a look at the progress of the senior sister.

She has just weighed the monomer and is preparing for the oxygen removal operation.

Judging by her appearance, she planned to operate the three-way valve while blowing with a hot hair dryer.

If you use it in this way, it is easy to cause problems.

Because there is only less than one second of reaction time to close the three-way valve after the low vacuum signal appears in the reaction vessel.

If it is closed early, the effect of deoxygenation is not ideal, and if it is closed late, the solution will be sucked away by the vacuum pump.

He didn't quite believe the senior sister's experimental ability, so he said:

"Sister, wait a minute, let me help you operate the hot hair dryer."

"Have you finished voting for your response?" Chen Wanqing looked at the fume hood next to her and said:

"Okay, then you can help me, I am also a little afraid that the solvent will be taken away."

...

After Chen Wanqing cast her response, she glanced at the time and said:

"It's finally done, and hopefully the response will be a little smoother this time around.

There is still some time, let's simply deal with the dirty bottles and put them in the alkali tank. "

Xu Qiu nodded and collected the dirty bottle from the last reaction.

First use a brush to remove the attachments on the inner wall of the bottle, then use tweezers to hold the bottle with the mouth facing up, and slowly press it under the alkali tank to fill them with the lye in the alkali tank.

Of course, Xu Qiu was very careful during this process. After all, if the splashed liquid gets on the skin accidentally, it will probably peel off a layer of skin.

After dinner, the two took the school bus back to the Handan campus.

...

Class meeting at seven o'clock in the evening.

There was a bit of a traffic jam on the road, and when Xu Qiu arrived at the location of the class meeting, the meeting room was already full of people.

The counselor Yu Qiang stood on the podium, looked at his watch, then glanced at the students sitting below, and said:

"It's almost time, let's get started."

"The students are all seniors this year, and I know that everyone's time is precious, and there may be various things to be busy with.

But I still called everyone together, mainly because I have a few important things to tell you, and we will try to make a long story short.

The first thing is about the graduate school. Now that the list of applicants has come out, I sent mass emails to all the students who signed up for the graduate school.

This list is also publicized on the first floor of materials, the second floor of materials, and the advanced materials building of our materials department.

Please log in to the postgraduate student promotion website and check whether there is any problem with the information on the Internet. For direct PhD students, if there are not enough materials, they must be supplemented in time.

If there is no problem with the information, you must click on the website to confirm the guarantee research and sign a letter of commitment.

I want to emphasize that after signing the letter of commitment, the school will close the permission to print your Chinese and English transcripts, and will not be able to issue a tripartite 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 won’t be able to apply abroad.

But it's normal, once the list is confirmed, if someone gives up the guarantee, the quota he occupied will be wasted, and the department will recruit one less graduate student.

There is nothing wrong with the faculty doing so.

It's like he originally had two roommates when he was a freshman, but in fact there was only one.

Just because another roommate dropped out and went to the University of Hong Kong, the school recruited one less undergraduate.

"The second thing is about the change of class cadres. Since the students joined the big family of the Materials Department in their sophomore year, we have re-elected the class cadres every year, and this year is no exception..."

The class cadres are selected once a year, mainly to allow more students to have student work experience.

In this way, when they graduate and look for a job, their resume can add a little bit of points. Although it may not be much, it is better than nothing.

Suddenly, Xu Qiu felt someone poke him with a piece of paper from behind.

Looking back, it was Yi Sijia, who was ahead of him in the interview for the insurance research institute, holding a sign-in sheet in her hand.

He nodded, took the sign-in form, and after signing in for himself, he also signed in for his roommate Ren Bin.

The counselor had announced the content of the class meeting in advance in the email. Ren Bin felt that it had nothing to do with him, so he asked Xu Qiu to help him sign in.

"The election of class cadres this time adopts a distribution system, giving priority to those students who are facing job hunting. Those who have been class cadres before should give the opportunity to other students this time.

Students who are interested, stay after the class meeting to discuss the issue of job assignment. "

The third thing is the issue of graduation. Students who fail professional courses, have less than 120 credits, or have a grade point of less than 2.0, must pay close attention to the last two semesters.

If these three standards are not met before graduation, it will affect the issuance of degree certificates.

If the dual certificates are not complete, it will affect the job hunting..."

Today's universities basically have wide admissions and wide exits, and the threshold for graduation requirements is set very low.

However, Xu Qiu also heard that someone had studied for eight years as an undergraduate, but failed to meet the graduation requirements, and was eventually forced to drop out by the school.

Because the upper limit of the undergraduate degree extension in the Shanghai 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 before it ended.

How about making a long story short?