My study
My specialty is a gas separation membrane using a polymer membrane.
Polymer membranes have the property of separating gases and are expected to be applied as gas separation materials by gas.A membrane capable of increasing the proportion of oxygen on the permeation side by passing gas from the supply side to the permeation side among various gas separation membranes is called an oxygen enrichment membrane and is used for a medical oxygen concentrator.Oxygen enriched membranes are often required to obtain air with an oxygen concentration of 30 to 40%, and those with higher oxygen permeability than high oxygen nitrogen selectivity are required.In order to make the polymer membrane have high oxygen permeability, it is possible to broaden the gap between macromolecules, prevent aggregation of polymer chains, and form new voids in the polymer membrane.Polydiphenylacetylenes have a rigid main chain structure and a wide molecular gap due to steric repulsion of highly substituted substituents.By introducing fluorine into macromolecules, aggregation of molecular chains can be prevented.By eliminating the leaving group in the polymer membrane state, it is possible to form a void in the polymer membrane.For these reasons, I am studying the synthesis of new polydiphenylacetylene introducing leaving group and fluorine and its gas permeation characteristics.
1-trimethylsilyl-2-pentafluorophenyldiphenylacetylene containing a pentafluorophenyl group with a high fluorine content was synthesized as a synthesis of novel polydiphenylacetylene.
2-bromo-5-iodobenzene and pentafluorobenzene were reacted in an aqueous solvent at 70 ° C for 24 hours under a nitrogen atmosphere using palladium acetate as a catalyst.Purification of the product by column chromatography gave 2-bromo-5-pentafluorophenylbenzene in 35% yield.Sonogashira coupling of the obtained product and trimethylsilylphenylacetylene was carried out to synthesize trimethylsilyl-pentafluorophenyldiphenylacetylene.This was also purified by column chromatography, and the yield was 24%.Metathesis polymerization was carried out using monomers thus obtained with tantalum pentachloride and n-butyltin.The number average molecular weight of the obtained polymer was measured by GPC to be 241,000.A polymer with a molecular weight sufficient to make a polymer membrane could be made.
We synthesized new polymers this time. A high molecular weight product sufficient for preparation of a polymer film having a number average molecular weight of 24100 could be obtained.
My specialty is a gas separation membrane using a polymer membrane.
Polymer membranes have the property of separating gases and are expected to be applied as gas separation materials by gas.A membrane capable of increasing the proportion of oxygen on the permeation side by passing gas from the supply side to the permeation side among various gas separation membranes is called an oxygen enrichment membrane and is used for a medical oxygen concentrator.Oxygen enriched membranes are often required to obtain air with an oxygen concentration of 30 to 40%, and those with higher oxygen permeability than high oxygen nitrogen selectivity are required.In order to make the polymer membrane have high oxygen permeability, it is possible to broaden the gap between macromolecules, prevent aggregation of polymer chains, and form new voids in the polymer membrane.Polydiphenylacetylenes have a rigid main chain structure and a wide molecular gap due to steric repulsion of highly substituted substituents.By introducing fluorine into macromolecules, aggregation of molecular chains can be prevented.By eliminating the leaving group in the polymer membrane state, it is possible to form a void in the polymer membrane.For these reasons, I am studying the synthesis of new polydiphenylacetylene introducing leaving group and fluorine and its gas permeation characteristics.
1-trimethylsilyl-2-pentafluorophenyldiphenylacetylene containing a pentafluorophenyl group with a high fluorine content was synthesized as a synthesis of novel polydiphenylacetylene.
2-bromo-5-iodobenzene and pentafluorobenzene were reacted in an aqueous solvent at 70 ° C for 24 hours under a nitrogen atmosphere using palladium acetate as a catalyst.Purification of the product by column chromatography gave 2-bromo-5-pentafluorophenylbenzene in 35% yield.Sonogashira coupling of the obtained product and trimethylsilylphenylacetylene was carried out to synthesize trimethylsilyl-pentafluorophenyldiphenylacetylene.This was also purified by column chromatography, and the yield was 24%.Metathesis polymerization was carried out using monomers thus obtained with tantalum pentachloride and n-butyltin.The number average molecular weight of the obtained polymer was measured by GPC to be 241,000.A polymer with a molecular weight sufficient to make a polymer membrane could be made.
We synthesized new polymers this time. A high molecular weight product sufficient for preparation of a polymer film having a number average molecular weight of 24100 could be obtained.
Japan's Probrem
I think that Japan's population decline and aging problem are major problems. As a reason for inviting this problem, low birthrate is considered to be a problem. The annual number of births in Japan was about 2.7 million in the first baby boom period and about 2.1 million in the 2 nd baby boom period, but in 1975 it broke down 2 million people, It continued decreasing every year. It fell below 1.5 million in 1984, and since 1991 it has been gradually declining as it repeatedly increased and decreased. The number of births in 2013 was 1029,816, a decrease of 7,415 from the 1037,231 in the previous year. Looking at the total special fertility rate, although it exceeded 4.3 during the first baby boom period, it fell sharply after 1950. After that, including the 2nd baby boom period, it had been moving at almost 2.1 units, but it fell again after falling below 2.0 in 1975. In 1989 it recorded 1.57, which was the lowest figure ever before, which was lower than the figure in 1966, and furthermore it fell to the lowest record of 1.26 in 2005. Although the birthrate is said to be preferable to be 2.1, although it is gradually recovering trend in recent years, it is very serious.
Especially it is said that child support cost per child is between 30 million yen and 40 million yen. It goes without saying that if the birthrate rises the demand for work will also increase and the Japanese economy will be enriched from now.
I think that assistance and support for older people who have made and supported Japan so far are also important, but thinking that it is more important to consider making things and making it easy to think about the future I will. So I think that demand is born, taxes arise and we can support the elderly with that money.
In Japan as well, I think that we should aim for child-friendly and easy-to-grow environments such as increasing tax reduction measures for families with many children, nursery schools, nursery schools, etc. like France. How is the fact that many families of households are more economically tough than a single nobleman with money?
Especially it is said that child support cost per child is between 30 million yen and 40 million yen. It goes without saying that if the birthrate rises the demand for work will also increase and the Japanese economy will be enriched from now.
I think that assistance and support for older people who have made and supported Japan so far are also important, but thinking that it is more important to consider making things and making it easy to think about the future I will. So I think that demand is born, taxes arise and we can support the elderly with that money.
In Japan as well, I think that we should aim for child-friendly and easy-to-grow environments such as increasing tax reduction measures for families with many children, nursery schools, nursery schools, etc. like France. How is the fact that many families of households are more economically tough than a single nobleman with money?
My opinion of garbage problem
Link : http://koji247.weebly.com/
I also believe that the issue of waste disposal in Japan in recent years has become very serious. In particular, I think that it is abnormal that the final disposal site can only be used for the remaining several years. In addition to recycling, thinking that this problem can be approached to solve is to reuse, reduce, and these are collectively referred to as 3R.
Reuse is to reuse what you can use. For example, even at the supermarket, I will bring a cash register section and use it when I go shopping again. This alone can reduce one garbage. Also, clothes used when the child is small will soon become smaller in size and will not be worn. Rather than throwing away things that can not be worn, you can give it to your neighbor's kids, or if you can use them when brothers can be created, you can reduce garbage. You can think of using recycled containers when doing an event, using jam flights etc. as accessories.
Reduce is not to receive extra things so as not to put out garbage in the first place. I talked about recycling supermarket shopping bag earlier, but since plastic shopping bags are easy to break, you can not get rid of ax that will not be torn by making cloth shopping bag. Also, when you make meals, you bought a lot at bargain sale but there is something you do not want to use. If you buy things of rose selling too, it will not become extra garbage.
By just practicing 3R like this you can drastically reduce the amount of garbage. In Yokohama City where I lived, I started about 10 years ago to waste discharge problem, and at that time I extruded this 3R all over. As a result, we were able to reduce waste emissions by 42.2% in about 10 years. As you can see, each person gets a little conscious and garbage can be reduced. Because we are the Earth where we live and the Earth in which we live our descendants I definitely want to cherish.
Link : http://koji247.weebly.com/
I also believe that the issue of waste disposal in Japan in recent years has become very serious. In particular, I think that it is abnormal that the final disposal site can only be used for the remaining several years. In addition to recycling, thinking that this problem can be approached to solve is to reuse, reduce, and these are collectively referred to as 3R.
Reuse is to reuse what you can use. For example, even at the supermarket, I will bring a cash register section and use it when I go shopping again. This alone can reduce one garbage. Also, clothes used when the child is small will soon become smaller in size and will not be worn. Rather than throwing away things that can not be worn, you can give it to your neighbor's kids, or if you can use them when brothers can be created, you can reduce garbage. You can think of using recycled containers when doing an event, using jam flights etc. as accessories.
Reduce is not to receive extra things so as not to put out garbage in the first place. I talked about recycling supermarket shopping bag earlier, but since plastic shopping bags are easy to break, you can not get rid of ax that will not be torn by making cloth shopping bag. Also, when you make meals, you bought a lot at bargain sale but there is something you do not want to use. If you buy things of rose selling too, it will not become extra garbage.
By just practicing 3R like this you can drastically reduce the amount of garbage. In Yokohama City where I lived, I started about 10 years ago to waste discharge problem, and at that time I extruded this 3R all over. As a result, we were able to reduce waste emissions by 42.2% in about 10 years. As you can see, each person gets a little conscious and garbage can be reduced. Because we are the Earth where we live and the Earth in which we live our descendants I definitely want to cherish.