Everyone is familiar with their cooperation. Moreover, this project has entered the optimization period, which is easier to understand.

Simply put, Liu Hao and his team chose to use polyN-isopropyl acrylamide as the temperature response polymer to modify polyethylene glycol to achieve temperature sensitivity.

Then, a molecular monomer containing the Diels-Alder reaction is used to form a dynamic covalent bond monomer to achieve memory function.

The synthesis method is to mix responsive monomers and crosslinking agents to form a gel through free radical polymerization.

The cross-linking reaction is carried out in the solution to form a uniform gel network. Finally, the gel network structure is realized by hydrogen bonding and π-π stacking.

The best situation in the laboratory is that it has achieved more than 70% fracture strength recovery, and the self-repair efficiency has also reached more than 75%.

However, Party A requires that the fracture strength recovery of at least 90% and the self-repair efficiency reach more than 95% of the parameter requirements are sufficient.

Because it is said that MIT has achieved more than 95% self-repair efficiency by introducing dual network dynamic keys, and at the same time, the breaking strength of the material has been restored to 92%.

UCLA also uses thermally responsive polymers to achieve fracture strength recovery of more than 90%.

The problem now is those solutions are less universal and costly, especially the cost of dynamic chemical bond design is too high and not suitable for large-scale industrialization.

So Liu Hao's mentor received this order. He wanted to make some breakthroughs, especially in the aerospace field, where there is a high demand for this material.

It is used in outer coatings, able to sense and repair microcracks, and self-repairing properties can extend the service life of the material in harsh environments in space.

At the same time, the temperature responsiveness can also protect the equipment from operating under extreme temperature conditions.

In addition, it is to manufacture energy storage battery electrode materials, which not only can structure adjustment or repair based on temperature changes during charging and discharging, but also can extend battery life and prevent safety accidents caused by thermal runaway.

Of course, there are many other applications of this kind of smart material, but according to Senior Brother Zhang's timeline, if they can really make it, the first thing Party A must do is to design products exclusively for these two directions.

Moreover, many domestic research institutes are making breakthroughs in this regard, but their research team and Huairou Institute are still ahead of the country at present.

Of course there are differences. For example, this time the project is quite large. In fact, the project is far more than these people today. There are also two other laboratories doing some supporting work.

However, Qiao Yu was still the same as that day. After learning about the specific laboratory methods in the laboratory, and after reading the documents and laboratory data in the office, he found that this problem was indeed quite difficult.

The main reason is that the entire laboratory environment is a dynamic reaction network, and there are indeed too many parameter dimensions.

Time, solution concentration, molecular force...too much can influence the results.

What is most confusing is that the data they collect is also very complex. Although there are already relatively mature solutions, as long as you change it a little, the parameters may be very different, or the material performance after self-repair is seriously deteriorated, and other problems...

Looking at the messy laboratory data, Qiao Yu felt amazed and understood that the current development of new materials means a large-scale trial and error test.

I probably know what I need, and there is a direction for how to get it out, but many details can only be tried and wrong, such as the concentration of the fusion agent, the gel crosslinking reaction time, and the ratio of the monomer to the crosslinking agent...

So, you need to try and make mistakes continuously for each step until you get a relatively satisfactory result.

Of course, there is nothing to criticize about this method. After all, everyone does this.

But it would be okay if the results of each experiment are linear. As long as you can slowly approach the ideal results, everyone can see hope and work is full of motivation.

But the problem is that from the results of each test, it is nonlinear. Simply put, sometimes the results look good, and then fine-tune it on this basis, and the result becomes worse again.

After fine-tuning, it became even worse. Until occasionally, a better result appeared from the laboratory samples...

After reading the laboratory records, Qiao Yu roughly understood why Professor Lu would ask them to do more experiments. This rule is too elusive.

Using these results as model simulation will make the supercomputer exhausted, and it will probably not be of much use.

After all, supercomputing simulation first requires collecting enough data so that it is possible to obtain some high-reliability possibilities without actually conducting experiments.

If there is no sufficient data support, various parameters cannot be effectively controlled. In this case, the supercomputer will be run wild, which is simply a waste of computing power.

After reading the laboratory records and some documents, Qiao Yu turned his head and looked at Senior Brother Liu who had been by his side, looking at him with anticipation.

He asked very seriously: "Senior Brother Liu, I am not questioning your major, I just want to ask, if you accidentally get a good result in a laboratory and then the laboratory records happen to be a mistake, will you go crazy?"

Liu Hao was stunned for a moment, then showed a complicated expression on his face, then pointed to the window next to him and said firmly: "Crazy? Let me tell you, in this case, if anyone's work is wrong, I will immediately throw anyone directly from that window!"

After saying that, it seemed that I was too cruel. Liu Hao added: "Of course, if it was a mistake I made, I wouldn't want anyone else to help me, so I would jump down by myself."

Qiao Yu thought about it and it should be on the fifth floor, and each floor of the chemistry building seemed to be higher than a normal building. He estimated that it could be about twenty meters away from the ground.

In addition, there is a hardened road surface under the window, and there seems to be little hope of surviving from a height of twenty meters.

This...If those who study mathematics are just a little dirty, those who study chemistry are too cruel!

I always throw people out of the window, which seems very unprofessional. If I really can't feed sulfuric acid directly? After all, throwing people downstairs can easily hit people...

"Hey, I'll call you Junior Brother Qiao, you don't know how hard it is to stay in the laboratory. Let me tell you this, for this project, I haven't had a rest for another half a year.

Really, do you dare to believe it if you haven't had a day off for more than half a year? You may not believe it. I slept for three nights for so long, and I was on a business trip with my boss to attend a meeting.

Not only am I like this, but everyone in the research team is almost the same. The average sleep time is no more than six hours a day. What is 996? We are really 007!

You just say that in this case, if there is a good result and the result is not recorded due to human reasons, even if I let him go, can anyone else let him go?"

Liu Hao started the crazy complaint mode.

Qiao Yu nodded, and then felt deeply worried. It makes sense that this chemistry building is not on the main campus.

Let’s not talk about the dangers of the laboratory building itself. If he stayed in the laboratory for so long, there would be some psychological problems. This building should be equipped with a psychiatrist.

Really, he originally felt that he and Senior Brother Chen had worked hard enough, but now it seems that Senior Brother Chen still has a lot of room to explore.

This made Qiao Yu seriously and asked, "I won't talk about this for now. I think you need to observe the pore structure and network uniformity inside the gel every time. This directly affects the repairability of the material, right?"

"It's not only that. You see, this directly affects the key functional groups. Only when the network structure is uniform, it means that dynamic covalent bonds and hydrogen bonds are formed. You can look at this in combination with infrared spectroscopy."

...

With all the questions and answers like this, Qiao Yu soon understood the entire process and the correlation between the test results.

Due to time constraints, Qiao Yu had another supper in the laboratory. Of course, this time Liu Hao asked Chen Jiang to go to the cafeteria to bring it to everyone.

Everyone is the same, a box of lunch and a bottle of mineral water, and a meal is solved in ten minutes.

Of course, the canteen of Yanbei University is cheap enough. Otherwise, eating like this every day will easily make the guests fall back into poverty.

That's the afternoon in the laboratory, a batch of new materials were undergoing various tests to collect and record data. In short, everyone in the laboratory was quite busy.

Even Chen Jiang was the same. According to Qiao Yu's observation, because every synthesis requires the preparation of solution, dirty bottles are constantly produced.

To put it bluntly, the entire laboratory is a more advanced and professional assembly line, not at all high-end.

"I know almost everything, but this time I have to think about how to deal with it. I have to bring back the data. You know, the last time the question was very simple, but this time it seems a bit troublesome, I have to think of something else."

After understanding everything that needed to be understood, Qiao Yu and Liu Hao said bluntly.

It’s not that he has reserved it mainly because the problem this time is indeed much more complicated than the last time.

And as Professor Lu said, the laboratory data is not enough. Well, it is not just not that simple enough, and there is no clear direction yet, which makes it very difficult to model and design simulation models.

Even if the model is designed, it does not have the ability to generalize. Even if it is forced to design, it may not be able to clearly know the direction of the experiment in the end. The biggest possibility is to repeatedly report errors.

The last time, the situation was at three different temperatures, and the other two temperatures had enough data support. After comparing, it was easy to analyze where the problem was.

Just by reading other documents and finding different temperatures of 500K and the other two different temperatures, different chemical reactions that may occur are enough, and you can make a general judgment.

To be honest, Liu Hao was somewhat disappointed.

But if you think about it carefully, this is actually the normal situation. After all, Qiao Yu is not a god...

To be honest, his experience in this area may not be as rich as Professor Lu.

I can only say that Qiao Yu gave him some unrealistic fantasies the fact that he solved the problem in one day last time.

But then again, at least Qiao Yu is not as dead as Professor Lu said, and there is still some hope.

So Liu Hao immediately said, "It's okay, just take it back for analysis. If necessary, we will have new data coming out every week. I'll ask Chen Jiang to send it to you."

"That's fine, by the way, I think Senior Brother Chen Jiang has a very good memory, and just washing bottles is a bit of a waste. After all, he has a good memory. Sometimes it may be helpful to the situation I mentioned just now. He throws people downstairs at any time, which is terrible."

Before leaving, Qiao Yu made a joke.

"Haha, in fact, we all came through this during the first year of graduate school. But you are right. It's time for Chen Jiang to do other things when we look back. It just so happens that our subject is not very experienced. I will tell the boss and then transfer to a graduate student."

Liu Hao also said with a haha.

What to say, since this chemistry senior brother Chen still remembers what kind of milk tea he likes to drink after half a year, Qiao Yu really doesn't mind saying good things casually.

Anyway, I have no losses to him, and I have a very good memory. I should remember my kindness for a long time, right?

...

After communicating with Liu Hao, Qiao Yu greeted the others in the laboratory again, patted his butt and left.

Liu Hao still sent Qiao Yu out to the downstairs of the experiment. After watching Qiao Yu sweep a small yellow car and leave, he then turned back to the laboratory.

When passing by Chen Jiang, Liu Hao stopped, thought about it for a while, and said, "Chen Jiang, there will be a junior brother to take over your business tomorrow. You can rest early today.

I will tell you Senior Brother Zhang later that he will take you to familiarize yourself with the laboratory. Well, let’s start with the simplest arrangement, no problem.”

Well, this sentence really surprised Chen Jiang.

Although he doesn't wash bottles every day, his senior brothers and sisters still let him participate in some simple experiments.

But when there is such an important topic, I still like to pull him to wash bottles. The reason is that he feels that he is more skilled in washing bottles and will not delay things.

This is really embarrassing.

To be honest, if Chen Jiang had a choice, he would rather go to those small projects to do the experiments on his own, which would be better than washing bottles in such a large-scale project team.

But there is no way. He has no human rights to graduate students who have been in the group for less than one year, especially when his supervisor is still very good. Moreover, he cannot miss the classes he should take, and he cannot choose any work he does in the laboratory...
To be continued...