Chapter 86: Single storage

　　 Xu Qiu returned to the bedroom after taking a shower, and found that there was a new message reminder on his mobile phone.
　　 is the reply from my senior sister five minutes ago:
　　 "I went to take a shower just now. I will go early tomorrow morning and be back in the afternoon. Let's meet at the school bus stop at about 8:40."
　　 "Okay." Xu Qiu replied.
　　 After thinking about it, he sent a good night expression again.
　　 Senpai quickly returned a good night expression.
　　……
　　 The next morning, the two met at the school bus spot and boarded the school bus bound for Zhangjiang campus.
On the way to 　　, Xu Qiu remembered the results of yesterday's high-level deduction, and proactively said:
　　 "Senior sister, the monomers we bought are now stored directly in the air. If they are exposed to water and oxygen for a long time, they should be broken."
　　 "This is indeed a problem," Chen Wanqing nodded and said:
　　"Actually, oxygen is not afraid, as long as our monomer materials are stored in the dark, because the reaction with oxygen must be under light conditions.
　　 is mainly because they are afraid that they will absorb water, which will affect the proportion of materials during the reaction. Moreover, the trimethyltin group will slowly react with water molecules at room temperature, leading to detin.
　　 However, there is no glove box in Zhang Jiang, so it is unrealistic for Teacher Wei to buy a glove box to store medicines.
　　 You can never store the monomer in the glove box of the Handan campus. Bring the monomer raw materials before each experiment. "
　　 "What should I do?" After she said that, she fell into thinking.
　　 "I have an idea, do you think this will work," Xu Qiu said:
　　"We put the monomer raw materials uniformly in a closed tank, and then add the water remover.
　　In addition, it can be filled with nitrogen in the past to maintain an inert atmosphere, and finally placed in a dark environment. "
　　 "This method is feasible." Chen Wanqing nodded.
　　 With an idea, she quickly reacted and added the details:
　　 "Use color-changing silica gel to absorb water, which can also act as an indicator, and add a three-way valve to vacuum the tank and fill it with nitrogen for protection."
　　 "Let's go to the drug warehouse and find out if there is a suitable container." Xu Qiu said.
　　……
　　 Zhangjiang campus, drug warehouse.
　　 Chen Wanqing described her needs to Ke Yunyun.
　　 Xu Qiu copied the drug warehouse into the simulation laboratory, and he mainly liked the glass instruments here.
　　 Copying the drug warehouse is equivalent to having almost unlimited clean glass instruments, so there is no need to spend energy on cleaning them after each experiment, which can save a lot of time.
　　 After some negotiations, Chen Wanqing also found a suitable sealed canned container, made of thick transparent glass, with an internal volume of about one liter.
　　 Ke Yunyun took the sealed container and proactively introduced:
　　"This is a sealed container commonly used in chemical laboratories to store drugs.
　　 There is a special space at the bottom where you can pour the desiccant, and then cover the top with a plastic partition with holes.
　　Beakers, petri dishes, etc. can be placed above the plastic partition, and then the medicines and reagents that need to be stored are put into it.
　　The surface area of ​​the contact part between the container and the lid is large, and a layer of vacuum silicone grease can be applied to achieve a strong vacuum sealing effect.
　　 Finally, there is a three-way valve above the lid, which can perform pumping and exhausting operations. "
　　 "We will get one of this sealed container." Chen Wanqing said.
　　 "Is there anything else I need?" Ke Yunyun asked after recording in the notebook.
　　 "Can the color-changing silicone be directly used here?"
　　 "The color-changing silica gel belongs to the category of pharmaceutical reagents. It needs to be ordered online first and cannot be used directly." Ke Yunyun said.
　　 "All right," Chen Wanqing thought for a moment, and said:
　　 "Take another two packs of 18cm filter paper, one pack of disposable dropper, one box of 1ml disposable syringes, a 25ml two-necked flask, 19 ports, two."
　　……
　　 With the materials they received, the two came to the front entrance of the Microelectronics Building.
　　 Xu Qiu tried his all-in-one card and found that the access control had been activated, and said casually:
　　 "The administrative efficiency of the school is quite high, and it was done in just one day."
　　 "It is estimated that there are relatively few procedures. You are a student of the Department of Materials Science, so you don't need to review it, just add your student ID." Chen Wanqing said.
　　 On the fifth floor, Chen Wanqing first ordered two boxes of color-changing silica gel using a computer, and then the two entered the A502 laboratory.
　　 Chen Wanqing walked in front, seeing her eagerly walking, as if she couldn't wait to know how she reacted yesterday.
　　 Xu Qiu held the supplies and walked behind.
　　 He knew that there were many loopholes in the reaction process here yesterday, so he was not optimistic about the results of this experiment.
　　 However, looking at the enthusiastic state of the senior sister, it is hard to speak to her.
　　 Xu Qiu just put on his protective equipment, when he heard the senior sister’s voice:
"what--"
　　 "Why is my nitrogen ball deflated."
　　 "Boy, why isn't your balloon deflated."
　　 Xu Qiu heard this and walked to the fume hood.
　　 He saw the nitrogen ball above the senior sister's reaction device hang his head, it should be an air tightness problem.
　　 However, seeing his reaction device, there was still air in the balloon, he was also a little puzzled.
　　 The system image that Xu Qiu compared at that time was the third-level 50% proficiency of the senior sister, and there was no vacuum silicone grease operation at that time.
　　 I thought about it carefully, could it be because he turned a few times hard when installing the glassware ~EbookFREE.me~, which resulted in better airtightness of the matte interface?
　　 thought for a while, Xu Qiu didn't worry about this problem anymore, and said to the senior sister:
　　 "It should be that the airtightness of your system is not good, it is leaking.
　　This kind of mass-produced glass instrument, with its own frosting, cannot ensure air tightness under long-term response.
　　 I think it is possible to apply vacuum silicone grease to the interface of the glass instrument, as Ke Yunyun said just now, to achieve a sealing effect. "
　　 "Hmm... makes sense." Chen Wanqing said.
　　 Xu Qiu put the previously purchased monomer material into a sealed tank, and then found the vacuum silicone grease in the laboratory.
　　 Since the senior sister has never used this thing, it should have been used by Feifei Wu or Duan Yun before.
　　 He applied vacuum silicone grease to the contact area between the sealed tank and the lid, and then turned the lid to coat it evenly.
　　 Next, connect the three-way valve on the lid to the vacuum pump. After pumping a vacuum for one minute, adjust the three-way valve to the three-way state.
　　The air pressure inside the sealed tank is very low. As long as it is checked whether it can maintain a vacuum state after a period of time, you can know how tight it is.
　　 After seeing Xu Qiu deal with it, Chen Wanqing said:
　　 "The toluene solvent inside my reaction vessel has evaporated to dryness, but there is still solid polymer on the wall of the bottle."
　　 "Maybe we can try to save it," Xu Qiu thought for a while and said:
　　"I guess it was caused by polymerization in the early stage of the reaction, when the system was still in a nitrogen atmosphere. At the later stage, the balloon collapsed, air entered, and the catalyst was deactivated, and the reaction basically stopped.
　　 Add some toluene to the reaction flask to see if it can dissolve. "
　　 "Okay, I will try." Chen Wanqing said.