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Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems

Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems

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  • Time of issue:2018-03-12 08:34
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(Summary description)Professor Guralp Ozkoc of Kocaeli University in Turkey and Professor Tarik Eren of Yildiz University of Technology prepare new phosphorus-containing or phenyl-containing 2-phenyl polymers through ring-opening metathesis polymerization

Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems

(Summary description)Professor Guralp Ozkoc of Kocaeli University in Turkey and Professor Tarik Eren of Yildiz University of Technology prepare new phosphorus-containing or phenyl-containing 2-phenyl polymers through ring-opening metathesis polymerization

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2018-03-12 08:34
  • Views:
Information

  Professor Guralp Ozkoc of Kocaeli University in Turkey and Professor Tarik Eren of Yildiz University of Technology prepare new phosphorus-containing or phenyl-containing 2-phenyl polymers through ring-opening metathesis polymerization, and 3-phosphate ester polymerization And 2 phenyl-3 phosphate copolymer, apply it to PP flame retardant, give full play to the environmental friendliness of polymerized flame retardant relative to small molecule additives, easy to blend with other polymers and difficult to get entangled from Advantages such as precipitation of polymer matrix.

Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


Researchers prepared 2-phenyl polymers, 3-phosphate polymers, and 2-phenyl-3 phosphate copolymers through molecular design, ring opening, decomposition, and polymerization. At the same time, octaphenyl POSS was selected to combine the above substances It is melt blended with PP/intumescent flame retardant (IFR) compound composed of ammonium polyphosphate and PP to prepare a new generation of polypropylene composite materials.    The core point of this work is to study the flame-retardant synergistic effect and mechanical properties of PP/IFR blends by phenyl-containing and phosphorus-containing homopolymers and copolymers and octaphenyl POSS.

  The target monomers are prepared by ordinary solution polymerization, and their homopolymers and copolymers are prepared by free radical polymerization. A new generation of PP composites can be prepared by melting and blending homopolymers and copolymers with PP/IFR system in a certain proportion.


Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


The structure characterization of small molecules and their homopolymers and copolymers by FTIR, 1HNMR, etc., indicates the successful preparation of the expected product, and TGA, DSC, UL94, LOI tests, etc. for homopolymers, copolymers and PP composite materials Perform thermal performance and combustion performance characterization.

   TGA test shows that the thermal decomposition temperature of 2-phenyl polymer is higher, and the carbon residue is about 15%; the thermal decomposition temperature of 3 phosphate ester polymer is advanced, and the carbon residue can reach 40%; 2 phenyl- 3 Phosphate ester copolymer residual carbon amount is between the two.


Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


The thermal stability test evaluation of the composite material shows that the thermal decomposition of the composite material is divided into two steps. The introduction of 2phenyl-3-phosphate copolymer will advance the decomposition of the first part of the composite material and improve the thermal stability of the second stage. obvious. The former is due to the catalytic decomposition of phosphoric acid groups, and the latter is due to the improvement of the thermal stability of composite materials.


Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


Perform dynamic mechanical analysis on the composite material after introducing the copolymer. Table 2 (V) is the test result. The storage modulus of the composite material has decreased, which may be due to the internal plasticization of the ester group, but as the temperature increases High, the difference in storage modulus between PP/IFR and PP/IFR/additive composites becomes smaller.


Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


The UL94 test and the LOI test are used to evaluate the combustion performance of the composite material. Pure PP is highly flammable and drips. The LOI value is only 18.3%. PP/IFR does not significantly improve the combustion performance, and there are still drips; PP/IFR/additives When a certain amount of addition is reached, the flame retardant level will increase, and the dripping phenomenon will slow down or disappear, and the LOI value can rise to more than 26%, indicating that the flame retardant performance of the composite material has improved.


Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


Shixian Study 20 | Turkish researchers have discovered that it is possible to use the ring-opening metathesis polymerization (ROMP) reaction to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems


Finally, the researchers explained the flame-retardant mechanism of composite materials: the mechanism is mainly the dual effect of the barrier effect of the carbon layer and the trapping effect of free radicals in the gas phase.

 

Content source:

Journal of Applied Polymer Science (Volume 135, Issue 11, March 15, 2018, page 45998)

Original link:

http://onlinelibrary.wiley.com/doi/10.1002/app.45998/full

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The original articles carefully compiled in the column of "Shixian Study" of this official account are for the purpose of conveying more information and academic discussion. It does not mean that this official account agrees with its views or confirms the authenticity of its content. The content of the article For learning reference only.

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