The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform

Lijun Qian - One of the best experts on this subject based on the ideXlab platform.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified app with different polyether segments and their flame retardant mechanism in polyurethane foam
    Composites Part B-engineering, 2019
    Co-Authors: Yajun Chen, Linshan Li, Xiaoqing Qi, Lijun Qian
    Abstract:

    Abstract Two kinds of phosphorus-containing Organosilicon Compounds (PCOCs) with different polyether segments (polyether segment with hydroxyl, PCOC–OH; polyether segment with amino group, PCOC–NH) were synthesized. They were used to modify ammonium polyphosphate (APP), which were named as MAPP-OH and MAPP-NH. Then MAPP-OH and MAPP-NH were respectively added into the low density-rigid polyurethane foam (LD-RPUF). MAPP-NH and MAPP-OH showed better thermal stability under N2 atmosphere. The pyrolysis behavior test results showed that the PO· free radical and NH3 release temperature of MAPP-NH began earlier and the release time of NH3 lasted longer than that of MAPP-OH, which can enhance the free radical quenching effect and dilution effect in gas phase. The flame retardant LD-RPUF was characterized by the limited oxygen index (LOI) measurement, horizontal burning test and cone calorimeter test. The results showed that the LOI value of LD-RPUF/MAPP-NH was higher than that of LD-RPUF/MAPP-OH. Meanwhile, the addition of MAPP-NH also dramatically reduced the total heat release and smoke of LD-RPUF during combustion than that of MAPP-OH.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified ammonium polyphosphate with different phosphorus containing groups and their different flame retardant mechanisms in polyurethane foam
    RSC Advances, 2018
    Co-Authors: Yajun Chen, Linshan Li, Lijun Qian
    Abstract:

    Two phosphorus-containing Organosilicon Compounds (PCOCs) with similar structure but different phosphorus-containing groups (phenyl phosphate group, PCOC1; phenylphosphoryl group, PCOC2) were synthesized. They were used to modify ammonium polyphosphate (APP), and the products obtained were coded as MAPP1 and MAPP2. Then MAPP1 and MAPP2 were respectively incorporated into low-density rigid polyurethane foam (LD-RPUF). The pyrolysis behavior of these two kinds of MAPP was investigated. Results showed that PCOC2, with the phenylphosphoryl group, induced the decomposition of APP, leading to early and rapid decomposition of MAPP2 with the release of NH3 in a short time and the formation of crosslinked structure quickly. Simultaneously, the phosphorus of MAPP2 was all retained in the condensed phase. In contrast, PCOC1, with the phenyl phosphate group, also induced the decomposition of APP. However, not all the phosphorus-containing groups of MAPP1 were retained in the condensed phase; some of the phosphorus was released into the gas phase in the form of PO2· and PO· free radicals. Evaluation of the flame-retardant effect by means of the cone calorimeter test demonstrated that MAPP2 had better flame-retardant properties in the LD-RPUF system, including the reduction of peak heat release rate, total heat release, and total smoke release. Moreover, the char yield of LD-RPUF/MAPP2 was more than that of LD-RPUF/MAPP1. Macro and micro photographs showed that MAPP2 can promote the LD-RPUF matrix to form an intumescent char layer with more complete and stable foam during the combustion process compared with MAPP1. Finally, a possible flame-retardant mechanism of MAPP1 and MAPP2 in LD-RPUF is proposed.

Yajun Chen - One of the best experts on this subject based on the ideXlab platform.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified app with different polyether segments and their flame retardant mechanism in polyurethane foam
    Composites Part B-engineering, 2019
    Co-Authors: Yajun Chen, Linshan Li, Xiaoqing Qi, Lijun Qian
    Abstract:

    Abstract Two kinds of phosphorus-containing Organosilicon Compounds (PCOCs) with different polyether segments (polyether segment with hydroxyl, PCOC–OH; polyether segment with amino group, PCOC–NH) were synthesized. They were used to modify ammonium polyphosphate (APP), which were named as MAPP-OH and MAPP-NH. Then MAPP-OH and MAPP-NH were respectively added into the low density-rigid polyurethane foam (LD-RPUF). MAPP-NH and MAPP-OH showed better thermal stability under N2 atmosphere. The pyrolysis behavior test results showed that the PO· free radical and NH3 release temperature of MAPP-NH began earlier and the release time of NH3 lasted longer than that of MAPP-OH, which can enhance the free radical quenching effect and dilution effect in gas phase. The flame retardant LD-RPUF was characterized by the limited oxygen index (LOI) measurement, horizontal burning test and cone calorimeter test. The results showed that the LOI value of LD-RPUF/MAPP-NH was higher than that of LD-RPUF/MAPP-OH. Meanwhile, the addition of MAPP-NH also dramatically reduced the total heat release and smoke of LD-RPUF during combustion than that of MAPP-OH.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified ammonium polyphosphate with different phosphorus containing groups and their different flame retardant mechanisms in polyurethane foam
    RSC Advances, 2018
    Co-Authors: Yajun Chen, Linshan Li, Lijun Qian
    Abstract:

    Two phosphorus-containing Organosilicon Compounds (PCOCs) with similar structure but different phosphorus-containing groups (phenyl phosphate group, PCOC1; phenylphosphoryl group, PCOC2) were synthesized. They were used to modify ammonium polyphosphate (APP), and the products obtained were coded as MAPP1 and MAPP2. Then MAPP1 and MAPP2 were respectively incorporated into low-density rigid polyurethane foam (LD-RPUF). The pyrolysis behavior of these two kinds of MAPP was investigated. Results showed that PCOC2, with the phenylphosphoryl group, induced the decomposition of APP, leading to early and rapid decomposition of MAPP2 with the release of NH3 in a short time and the formation of crosslinked structure quickly. Simultaneously, the phosphorus of MAPP2 was all retained in the condensed phase. In contrast, PCOC1, with the phenyl phosphate group, also induced the decomposition of APP. However, not all the phosphorus-containing groups of MAPP1 were retained in the condensed phase; some of the phosphorus was released into the gas phase in the form of PO2· and PO· free radicals. Evaluation of the flame-retardant effect by means of the cone calorimeter test demonstrated that MAPP2 had better flame-retardant properties in the LD-RPUF system, including the reduction of peak heat release rate, total heat release, and total smoke release. Moreover, the char yield of LD-RPUF/MAPP2 was more than that of LD-RPUF/MAPP1. Macro and micro photographs showed that MAPP2 can promote the LD-RPUF matrix to form an intumescent char layer with more complete and stable foam during the combustion process compared with MAPP1. Finally, a possible flame-retardant mechanism of MAPP1 and MAPP2 in LD-RPUF is proposed.

Linshan Li - One of the best experts on this subject based on the ideXlab platform.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified app with different polyether segments and their flame retardant mechanism in polyurethane foam
    Composites Part B-engineering, 2019
    Co-Authors: Yajun Chen, Linshan Li, Xiaoqing Qi, Lijun Qian
    Abstract:

    Abstract Two kinds of phosphorus-containing Organosilicon Compounds (PCOCs) with different polyether segments (polyether segment with hydroxyl, PCOC–OH; polyether segment with amino group, PCOC–NH) were synthesized. They were used to modify ammonium polyphosphate (APP), which were named as MAPP-OH and MAPP-NH. Then MAPP-OH and MAPP-NH were respectively added into the low density-rigid polyurethane foam (LD-RPUF). MAPP-NH and MAPP-OH showed better thermal stability under N2 atmosphere. The pyrolysis behavior test results showed that the PO· free radical and NH3 release temperature of MAPP-NH began earlier and the release time of NH3 lasted longer than that of MAPP-OH, which can enhance the free radical quenching effect and dilution effect in gas phase. The flame retardant LD-RPUF was characterized by the limited oxygen index (LOI) measurement, horizontal burning test and cone calorimeter test. The results showed that the LOI value of LD-RPUF/MAPP-NH was higher than that of LD-RPUF/MAPP-OH. Meanwhile, the addition of MAPP-NH also dramatically reduced the total heat release and smoke of LD-RPUF during combustion than that of MAPP-OH.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified ammonium polyphosphate with different phosphorus containing groups and their different flame retardant mechanisms in polyurethane foam
    RSC Advances, 2018
    Co-Authors: Yajun Chen, Linshan Li, Lijun Qian
    Abstract:

    Two phosphorus-containing Organosilicon Compounds (PCOCs) with similar structure but different phosphorus-containing groups (phenyl phosphate group, PCOC1; phenylphosphoryl group, PCOC2) were synthesized. They were used to modify ammonium polyphosphate (APP), and the products obtained were coded as MAPP1 and MAPP2. Then MAPP1 and MAPP2 were respectively incorporated into low-density rigid polyurethane foam (LD-RPUF). The pyrolysis behavior of these two kinds of MAPP was investigated. Results showed that PCOC2, with the phenylphosphoryl group, induced the decomposition of APP, leading to early and rapid decomposition of MAPP2 with the release of NH3 in a short time and the formation of crosslinked structure quickly. Simultaneously, the phosphorus of MAPP2 was all retained in the condensed phase. In contrast, PCOC1, with the phenyl phosphate group, also induced the decomposition of APP. However, not all the phosphorus-containing groups of MAPP1 were retained in the condensed phase; some of the phosphorus was released into the gas phase in the form of PO2· and PO· free radicals. Evaluation of the flame-retardant effect by means of the cone calorimeter test demonstrated that MAPP2 had better flame-retardant properties in the LD-RPUF system, including the reduction of peak heat release rate, total heat release, and total smoke release. Moreover, the char yield of LD-RPUF/MAPP2 was more than that of LD-RPUF/MAPP1. Macro and micro photographs showed that MAPP2 can promote the LD-RPUF matrix to form an intumescent char layer with more complete and stable foam during the combustion process compared with MAPP1. Finally, a possible flame-retardant mechanism of MAPP1 and MAPP2 in LD-RPUF is proposed.

Xiaoqing Qi - One of the best experts on this subject based on the ideXlab platform.

  • the pyrolysis behaviors of phosphorus containing Organosilicon Compound modified app with different polyether segments and their flame retardant mechanism in polyurethane foam
    Composites Part B-engineering, 2019
    Co-Authors: Yajun Chen, Linshan Li, Xiaoqing Qi, Lijun Qian
    Abstract:

    Abstract Two kinds of phosphorus-containing Organosilicon Compounds (PCOCs) with different polyether segments (polyether segment with hydroxyl, PCOC–OH; polyether segment with amino group, PCOC–NH) were synthesized. They were used to modify ammonium polyphosphate (APP), which were named as MAPP-OH and MAPP-NH. Then MAPP-OH and MAPP-NH were respectively added into the low density-rigid polyurethane foam (LD-RPUF). MAPP-NH and MAPP-OH showed better thermal stability under N2 atmosphere. The pyrolysis behavior test results showed that the PO· free radical and NH3 release temperature of MAPP-NH began earlier and the release time of NH3 lasted longer than that of MAPP-OH, which can enhance the free radical quenching effect and dilution effect in gas phase. The flame retardant LD-RPUF was characterized by the limited oxygen index (LOI) measurement, horizontal burning test and cone calorimeter test. The results showed that the LOI value of LD-RPUF/MAPP-NH was higher than that of LD-RPUF/MAPP-OH. Meanwhile, the addition of MAPP-NH also dramatically reduced the total heat release and smoke of LD-RPUF during combustion than that of MAPP-OH.

Mark E. Davis - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of zeolites using Organosilicon Compounds as structure-directing agents
    Microporous Materials, 1994
    Co-Authors: Hong-xin Li, Miguel A. Camblor, Mark E. Davis
    Abstract:

    Zeolites ZSM-5 and ZSM-11 are synthesized using the Organosilicon Compound N-trimethoxysilylpropyltri-N- butylammonium as structure-directing agent. For ZSM-5, results from thermogravimetric analyses and 13C and 29Si nuclear magnetic resonance (NMR) spectroscopy prove that the Organosilicon Compound resides intact at the channel intersections and that the silicon atom in this species is located in a framework position. The consequences of this new type of structure direction towards the synthesis of new microporous materials are discussed.