With everyone's cooperation, it can be regarded as a familiar road. Moreover, this topic has entered the optimization period, making it easier to understand.

To put it simply, Liu Hao and the others chose to use poly-N-isopropylacrylamide as a temperature-responsive polymer and modified polyethylene glycol to achieve temperature sensitivity.

Then use molecular monomers containing Diels-Alder reaction to form dynamic covalent bond monomers to realize the memory function.

The synthesis method is to mix responsive monomers with cross-linking agents and form gels through free radical polymerization.

A cross-linking reaction is carried out in the solution to form a uniform gel network. Finally, the network structure of the gel is achieved through hydrogen bonding and π-π stacking.

At present, the best situation in the laboratory is to achieve more than 70% fracture strength recovery, and the self-healing efficiency has also reached more than 75%.

However, Party A requires that at least 90% of fracture strength recovery and self-repair efficiency of more than 95% be achieved.

Because it is said that MIT has achieved more than 95% self-healing efficiency by introducing dual network dynamic bonds, and at the same time, the material's fracture strength recovery has reached 92%.

The University of California, Los Angeles, has also used thermally responsive polymers to achieve materials that recover more than 90% of their fracture strength.

The current problem is that those solutions have low universality and high cost. In particular, the cost of dynamic chemical bond design is too high and is not suitable for large-scale industrialization.

That's why Liu Hao's mentor received this order because he wanted to make some breakthroughs. Especially in the field of aerospace vehicles, there is a high demand for this material.

Used in outer coatings, it can sense and repair micro-cracks, and its self-healing properties can extend the service life of materials in the harsh environment of space.

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

The other is to manufacture energy storage battery electrode materials, which can not only make structural adjustments or repairs according to the temperature changes generated during charging and discharging, but also extend battery life and prevent safety accidents caused by thermal runaway.

Of course, this kind of smart material has many other applications, but according to Brother Zhang's schedule, if they can really make it, Party A will definitely design products specifically for these two directions.

And now many domestic research institutes are making breakthroughs in this area, but their research group and the Huairou Institute are still ahead in the country.

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

However, Qiao Yu was still the same as that day. After understanding the specific laboratory methods in the laboratory and looking at the literature and laboratory data in the office, he found that this time the 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 forces... there are too many situations that can affect the results.

The most troubling thing is that the data they collected is also very complicated. Although there are already relatively mature solutions, with just a slight change, the parameters may be completely different, or the material properties after self-repair may be seriously deteriorated, etc.

question……

Looking at the messy laboratory data, Qiao Yu felt astonished and understood that the current development of new materials was just a large-scale trial and error experiment.

I know roughly what I need, and I have a direction on how to make it, but many details have to be trial and error, such as the concentration of the fusion agent, the gel cross-linking reaction time, and the ratio of monomers to cross-linking agents.

…

Wait, you need to continue trial and error at each step until you get a relatively satisfactory result.

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

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

But the problem is that the results of each test are non-linear. To put it simply, sometimes the results look good, and then after fine-tuning on this basis, the results become worse again.

After further fine-tuning, it got worse. Until occasionally a better result appeared from a laboratory sample...

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

Using these results to make models and run simulations will exhaust the supercomputer, but it won't be of much use.

After all, supercomputing simulation must first collect enough data, so that it is possible to obtain some highly reliable possibilities without actually conducting experiments.

If there is not enough data support, various parameters cannot be effectively controlled. In this case, letting the supercomputer run blindly is a waste of computing power.

After reading the laboratory records and some documents, Qiao Yu turned his head and glanced at Senior Brother Liu who had been beside him and looked at him expectantly.

He asked very seriously: "Brother Liu, I am not questioning your professionalism, I just want to ask, if you accidentally got a good result in the laboratory, and then there happened to be a mistake in the laboratory records, what would you do?

Will you go crazy?"

Liu Hao was stunned for a moment, and then a complicated expression appeared on his face. Then he pointed to the window next to him and said decisively: "Crazy? Let me tell you, in this case, whoever made a mistake in their work will be punished immediately.

Who just threw it out of that window!"

After saying that, he seemed to feel that he was too cruel, so Liu Hao added: "Of course, if it was me who made the mistake, I wouldn't ask for help from others and would jump off myself."

Qiao Yu thought for a while, this 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 was probably nearly 20 meters above the ground.

In addition, there is a hardened road below the window, so there seems to be little hope for a person to survive a fall from a height of twenty meters.

Well...if those who study mathematics are just a little bit dirty, those who study chemistry are too cruel!

It seems very unprofessional to throw people out of the window at every turn. If you can't just feed sulfuric acid directly? After all, throwing people downstairs can easily hit them...

"Hey, let me 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 rested for more than half a year.

Seriously, can you believe that I haven’t had a day off in the past six months? You may not believe it, but I have only had three good nights of sleep in such a long time, and I was on a business trip with my boss to attend a meeting.

Not only is this the case for me, but the rest of the research team is similar. The average sleep time is no more than six hours a day. What is 996? We are the real 007!

Just say that in this case, if there is a good result, but the result is not recorded due to human reasons, even if I let him go, can others let him go?"

Liu Hao turned on the crazy complaining mode.

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

Not to mention the danger of the laboratory building itself, if he stayed in the laboratory for such a long time, he would most likely have some psychological problems. There should be a psychiatrist in this building.

Really, he originally thought 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 tap into his potential.

This made Qiao Yu become serious and asked: "Let's not 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?"

"More than that. You can see that this directly affects the key functional groups. Only the network structure is uniform, indicating the formation of dynamic covalent bonds and hydrogen bonds. You can combine this with infrared spectroscopy to see this."

…

Just like this, Qiao Yu quickly understood the entire process and the correlation of the test results.

Due to time constraints, Qiao Yushun took another dinner in the laboratory. Of course, this time Liu Hao asked Chen Jiang to bring it to everyone in the cafeteria.

It's the same for everyone, a box lunch, a bottle of mineral water, and a meal in ten minutes.

Of course, the canteen of Yanbei University is cheap enough. Otherwise, eating like this every day will easily make the person who is treating the guests return to poverty.

That is to say, in the laboratory this afternoon, a batch of new materials were undergoing various tests and collecting and recording data. In short, everyone in the laboratory was quite busy.

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

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

"I understand it almost, but this time I have to think carefully about how to deal with it. I have to take this data back. You know, the question last time was very simple, but this time it seems a bit troublesome. I have to think of other things.

way."

After understanding everything he needed to know, Qiao Yu told Liu Hao very straightforwardly.

It's not that he has any reservations, it's mainly that the problem this time is indeed much more complicated than last time.

And as Professor Lu said, the laboratory data is not enough. Well, in fact, it is not only not simple enough, but also lacks a clear direction, which makes it very difficult to model or design simulation models.

Even if the model is designed, it does not have the ability to generalize. Even if the design is forced, the experimental direction may not be clearly known in the end, and the most likely error will be repeated.

The last situation was at three different temperatures. The other two temperatures have enough data support. After comparison, it is easy to analyze where the problem lies.

As long as you read other literature and find out the different chemical reactions that may occur at 500K and the other two different temperatures, you can make a rough judgment.

To be honest, Liu Hao was somewhat disappointed.

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

To be honest, he may not have as much experience in this area as Professor Lu.

It can only be said that the fact that Qiao Yu solved the problem in one day last time gave him some unrealistic fantasies.

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

So Liu Hao immediately said: "It's okay, you can just take it back for analysis. If necessary, we will have new data coming out every week. I will 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. Just washing bottles is a bit of a waste. After all, he has a good memory. Sometimes it may be helpful for the situation I just mentioned. He can easily send people upstairs.

Throwing it down, it’s terrible.”

Before leaving, Qiao Yu made a joke.

"Haha, actually we did this during the first year of graduate school, but you're right, it's time to let Chen Jiang do other things later. It just so happens that we don't have enough manpower for this subject. I'll tell the boss later and adjust it again.

A graduate student is here."

Liu Hao also said haha.

What can I say, Qiao Yu really doesn't mind casually saying nice things for the sake of Senior Brother Chen, who is engaged in chemistry, still remembering what kind of milk tea he likes to drink after half a year.

Anyway, he didn’t have any losses to him, and he has a particularly good memory, so he should be able to remember his gratitude for a long time, right?

…

After communicating with Liu Hao, Qiao Yu said hello to other people in the laboratory, then patted his butt and left.

Liu Hao sent Qiao Yu out to the downstairs of the laboratory. After watching Qiao Yu grab a small yellow car and drive away, he turned back to the laboratory.

When passing by Chen Jiang, Liu Hao stopped, thought for a moment, and then said: "Chen Jiang, a junior brother will come to take over your affairs tomorrow. You should rest early today.
To be continued...