Polypropylene Catalytic Alloy Structure Characterization

Polypropylene Catalytic Alloy Structure Signature Zhang Yuqing Department of Chemical Engineering, Luoyang Institute of Technology Luoyang 471039, Fan Zhiqiang, Feng Linxian, Department of Polymer Science and Technology, Zhejiang University, Hangzhou 310027, China Polymer mainly consists of two parts: random ethylene-propylene copolymer and various lengths of ethylene-propylene block. composition. Together with the propylene homopolymer, the polypropylene catalytic alloy is a mixture with a polydisperse structure. This special structure is the main reason for the high impact resistance of polypropylene catalytic alloys.

Polypropylene Catalyzed Alloy is a kind of Ziegler Natta using a special structure, catalyst and new synthesis process, the kind of polypropylene blend prepared directly in the reactor 5. The first component introduced is ethylene propylene rubber 0, Or polyethylene may also be a comonomer because the conjugate is carried out in a reactor, so this type of blend is also called a reactor blend. Polypropylene catalytic alloys, due to their unique mix of various structural components, have provided shock resistance to Shanghai.

As we all know. Elastomers have very different sequence distribution effects on polypropylene and have different effects. Some people think that there is a need for agent for the ethylene-propylene segment copolymerization of the B component of the B block, and the ethylene propylene block copolymer is obtained, and the existence of the block is confirmed through analysis. However, some researchers believe that this block may be a mixture of 1 and 1, and Xie often has 1 pair of commercially available ethylene-propylene block copolymers to prove that it is a blend of, and, a theoretically proven, Catalyst 1 step copolymerization + possible block copolymer. However, there is increasing evidence that ethylene-propylene block copolymers can be obtained under suitable conditions. For this kind of block structure, if it contains both, the impact will be great. The use of a high ethylene content in the ethylene monomer may result in copolymers containing both ethylene and ethylene-propylene blocks.

There are few reports on the structure of these copolymers.

A careful analysis of the copolymers obtained by the stepwise copolymerization of ethylene-propylene was carried out to prove the presence of a fire molecule with a long ethylene segment embedded in the random ethylene-propylene chain. This is enough to leave a small part of propylene consciously after the end of homopolymerization of propylene, so the polymerization of the first stage is equivalent to the ethylene-propylene copolymerization of ethylene content. But this part of the copolymer rear exhausted unreacted propylene monomer followed by ethylene propylene gas phase polyethylene content of yttrium, obtained polypropylene ethylene propylene copolymer catalytic alloy nail with high impact strength. In order to explain the hunger-induced structure of poly-1-nelen compounds synthesized by this process and its effect on material properties, a differential scanning calorimetry method using temperature gradient grading was used. 3, Fourier infrared 1 and helium-neon resonance technics Polypropylene catalytic alloy 60 was imported into the factory for analysis of clothing in order to avoid the relationship between structure and performance.

1 Experimental section 1.1 Sample grading Polycarbonate was used as the first-generation spherical core in the first step, and the first 13-catalyst was first polymerized in propylene, and then gas-phase ethylene-propylene copolymer was obtained. The sample selected for this experiment was infiltrated under the condition that the ethylene content in the gas phase was 60, and numbered 60. The 60 polypropylene alloy was heated and dissolved with n-octane and left to stand at room temperature, and the precipitate was separated. The lysate in the mother liquor is a room temperature fraction. The precipitates are placed in a temperature gradient extractor and extracted at different temperatures. Thermostatic extraction at each temperature 12.

1.2 Determination of Ethylene Content The ethylene content in the sample is 50, and the 150-spectrum Fourier-only red extract is before and after annealing. The former is a wide, round, single peak, and after annealing, complex multiple peaks appear, some of which are relatively sharp. This phenomenon suggests that extracts may contain series or block copolymers of ethylene-propylene copolymers of different lengths. During annealing, these molecules relax and equilibrate at a corresponding temperature for a long time to achieve sufficient crystallization. These different crystals show multiple melting peaks on melting.

May be caused by the polydispersity of the composition or structure.

External analyzer for analysis.

1.3 Thermal analysis will be performed at each stage before annealing. At 1060, for every 10 drops, 121 is incubated to maximize crystallisation. The alloy and its boiling heptane extract are also processed in this way. Annealed samples were calorimetrically analyzed on a 14,87 instrument. The sample is heavy and the heating rate is 50.

One of the samples was selected for analysis at the pressure 04001 Mountain Hard Magnetic Resonance Wenshang Hall 1. Solvents instead of neighbors.

15 bounds 1.120, the following hexamethylsilyl ether as an internal standard.

2 Results and discussion 2.1 Classification results and composition analysis Temperature gradient classification method is based on the solubility of different structural molecules with temperature changes and classification. Due to the nature of the catalytic system, the composition of the copolymer is very complicated. As a result, polypropylene catalyzed alloy 60 had an extract at 7 temperatures, and the ethylene content did not change. Among them, there are more class components of room temperature 100, and 0. From the point of view of the physical state of all levels, except for room temperature, the other fractions are powdered. Although the ethylene content of 50100, 5 fractions is higher than room temperature, there is no flexibility. Its molecular structure is not the same. The bromine has a very low ethylene content and is essentially homopolypropylene 2.2 thermoanalyzed tile 60 alloy and its decane. The smelt spectrum of the product is found at 1 and 2. The alloy has a strong melting peak at 160°C. The peak is relatively wide, and there appear to be shoulder peaks on both sides. In addition, at 120, there is a very small peak to the right. These results indicate that the 60 alloy has a complicated phase structure. This complexity is divided into various levels after annealing. In addition to the simple unimodal or double peaks of 500 and insolubles, the other fractions are different crystals at the same temperature, so multiple peaks appear.

According to the points of all levels, 淄嫉 榭觯 榭觯, ≡窳 9 OP OP OP OP OP OP OP OP OP OP OP OP 43 is the spectrum of the room temperature fraction. This is a typical random ethylene-propylene copolymer. 41 is 90, the score of the score. There is a strong peak at 3 = 28.05 in the spectrum. Follow the method of 1.1. This peak is attributed to the 8.1 carbon peak, corresponding to the peak produced by the long ethylene sequence. The presence of this strong peak indicates that the content of long ethylene chain 1 is high. In addition, there are still Jiruzi et al., the chain of the polymer chain, and the shorter C1 chain. In this case, these grades are classified into random Ethylene-Propylene Copolymers with long ethylene segments embedded in random chains. Although the content of this fraction is less than 2 but it can be derived from 1, there is reason to infer that the structure of this fraction should be similar to that of this fraction.

In this case, the copolymer having such a structure occupies about 9 peaks of the lezenate homopolymer, and both are very strong.

On the other hand, the peak 5 of the ethylene chain is very weak. 5. The presence of peaks The ethylene in this fraction was only present in very few blocks in the Huda macromolecules. The above-mentioned Hehe, the circumstance of the praying fruit indicates that the ethylene propylene produced by the first ethylene propylene copolymerization during the synthesis of the polypropylene catalytic alloy The structure of the copolymer has a very complex polydispersity. The copolymers contain a long block of ethylene and a block of ethylene in these copolymers, which can provide better compatibility with propylene homopolymers. It is the main factor to increase the impact strength of the alloy.

Zheng Mei was arrested in a relatively wide range, and had a better outlook than polyhexenes in the ethylene-propylene block and ethylene-segment block. Polypentene containing only a few ethylene-propylene blocks had better impact resistance. . The polypropylene with an ethylene content of 9.2, its impact strength for the paw as a sheet for the synthesis of polymene oxide catalytic alloys with an ethylene content of 8.4 has an impact strength of 4271. Even at 30 cubits its strength still has 82. Available reactor particles Technically synthesized polypropylene catalytic alloys have very good low temperature impact resistance.

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