Fast Delivery 4-phenylethynyl phthalic anhydride 119389-05-8 Trade CAS NO.119389-05-8

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2. The purity of products >99%.

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5. Clearance rate of multiple ports >99%.

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Appearance: Pale yellow to yellow powder

Purity: 99%

Fast Delivery 4-phenylethynyl phthalic anhydride 119389-05-8 Trade

Properties

Description&Application

4-Phenylethynylphthalic Anhydride is a useful research chemical.

Preparation Products

Results and discussion

The Structure and Morphology of Materials.

The fabrication of the Fe3O4/SiO2/P(GMA-co-EGDMA)-PEI-Pd(0) catalyst was shown as scheme

1. To investigate the composition of each material, the Fe3O4, Fe3O4@SiO2, A-174 modified

Fe3O4@SiO2, Fe3O4/SiO2/P(GMA-co-EGDMA) and Fe3O4/SiO2/P(GMA-co-EGDMA)-PEI was

characterized by FTIR, respectively. As shown as Fig.1, all curves show the characteristic absorption

peak corresponding to stretching vibration of the Fe-O bond at 572 cm-1, and it indicates the presence

of Fe3O4. Simultaneously, Fig.1a shows a characteristic absorption peak corresponding to the

stretching vibration of νO-H, and it indicates the existence of the hydroxy groups on the surface of the

magnetic Fe3O4 nanocrystallines. Compared with Fig.1a, Fig.1b shows a strong absorption peak and

a moderate absorption peak at 1081 cm-1 and 793 cm-1, respectively. It can be respectively attributed

to the antisymmetrical and symmetrical stretching vibration of Si-O-Si bond in oxygen-silicon

tetrahedron, and it well indicates the presence of silica. After being modified by A-174, Fig.1c

appears a characteristic absorption peak at 1728 cm-1 which is attributed to the stretching vibration of

νC=O. Obviously, the absorption peak is very weak because the content is very low relative to the

materials, but it can still indicate that the surface of Fe3O4@SiO2 had been successfully modified by

A-174. At the same time, the nanoparticles transformed into strong hydrophobicity from previous

strong hydrophilcity after this modification, so that wall-climbing phenomenon can be clearly

observed when the A-174 modified magnetic Fe3O4@SiO2 composite nanoparticles were dispersed

in water (as Fig.2b) by comparing with the previous magnetic Fe3O4@SiO2 composite nanoparticles

(as Fig.1f), but it can be well dispersed in ethanol (as Fig.1h). All of which demonstrates the

aforementioned conclusion well. In addition, Fig.1d shows that all the absorption peaks at 2921 cm-1 ,

2852 cm-1 and 1728 cm-1 had been significantly enhanced after the coating of P(GMA-co-EGDMA),

and it powerfully illustrates that the polymer shell had been successfully coated on the outer surface

of the A-174 modified magnetic Fe3O4/SiO2 composite nanoparticles. Subsequently, the

branched/linear PEI was grafted on the surface of the Fe3O4/SiO2/P(GMA-co-EGDMA) through the

ring opening reaction between amino groups and epoxy groups. As shown as Fig.1e, all the

characteristic absorption peaks at 3437 cm-1, 2921 cm-1 and 2852 cm-1 had been enhanced to some

extent based on the sbsorption peak at 1081 cm-1. Primarily, the enhancement of the peak at 3437

cm-1 was caused by the stretching vibration of νN-H, and the enhancement of the peaks at 2921 cm-1

and 2852 cm-1 was caused by the stretching vibration of νC-H of methyl and methylene in PEI. All of

which indicates that the PEI had been successfully grafted on the surface of the magnetic

Fe3O4/SiO2/P(GMA-co-EGDMA) composite nanoparticles.

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