Thermal degradation and flame retardancy of polynorbornene by a zeolite

Mizuno, Kohshiroh; Ueno, Tomonaga; Hirata, Akihiro; Ishikawa, Toshiyuki; Takeda, Kunihiko

doi:10.1016/j.polymdegradstab.2006.11.021

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…The second decomposition occurs between 400 and 550 °C, and is due to the decomposition of the remaining portion of the azo dye. The third decomposition between 600 and 1 000 °C, is due to the decomposition of the polynorbornenes backbone 45, 46. Homopolymers 7 and 8 and copolymer 9 showed complete degradation at temperatures below 900 °C (850, 700 and 840 °C respectively), whereas, copolymer 10 showed complete degradation above 950 °C.…”

Section: Discussionmentioning

confidence: 99%

Homo‐ and Co‐Polymers of Norbornene Containing Aryl‐ and Hetaryl‐Azo Dyes; Synthesis and Sensing Properties

Abd‐El‐Aziz

Shipman

Shipley

et al. 2009

Macro Chemistry & Physics

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A series of polynorbornene homo‐ and copolymers containing aryl‐ and/or hetaryl‐azo dyes were prepared through ring‐opening metathesis polymerization (ROMP). Thermal studies indicated that the polymers were thermally stable up to 250 °C, and possessed glass transition temperatures ranging from 93 to 133 °C. In THF solutions, the aryl‐azo dye containing homopolymers, displayed λmax = 417 nm while the hetaryl‐azo dye containing homopolymers displayed λmax = 495 nm. The copolymers displayed a λmax that encompassed both the aryl‐ and hetaryl‐azo dye range. The monomers and polymers showed bathochromic shifts in solution when acidified. The polymers were cast into films that changed colour in the presence of both aqueous 1.2 M HCl or HCl(g). The colour change reverses when exposed to aqueous 1.2 M NaOH or NH3(g). This process was repeated several times without disintegration of the polymer film, indicating that these polymers may be useful as reusable acid sensors.

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Section: Discussionmentioning

confidence: 99%

Homo‐ and Co‐Polymers of Norbornene Containing Aryl‐ and Hetaryl‐Azo Dyes; Synthesis and Sensing Properties

Abd‐El‐Aziz

Shipman

Shipley

et al. 2009

Macro Chemistry & Physics

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“…We have been studying the flame retardancy of polymeric materials by analyzing the relationship between pyrolysis modes and combustion behavior 26,27 . In vertical combustion tests, we found that olefin resins were not ignited and achieved V‐0 in specific molecular regions ( M w = 10 3 ~ 10 4 ) 28,29 . Therefore, if the cleaved main chain of PP is accelerated and the molecular weight of PP is reduced to about M w = 10 3 ~ 10 4 just before combustion, it can be expected that flame retardancy can be obtained in the vertical combustion test 30,31 .…”

Section: Introductionmentioning

confidence: 99%

“…26,27 In vertical combustion tests, we found that olefin resins were not ignited and achieved V-0 in specific molecular regions (M w = 10 3 $ 10 4 ). 28,29 Therefore, if the cleaved main chain of PP is accelerated and the molecular weight of PP is reduced to about M w = 10 3 $ 10 4 just before combustion, it can be expected that flame retardancy can be obtained in the vertical combustion test. 30,31 In this study, we discovered the co-adding solid acid with NOR116 provided the molecular weight changed to a specific molecular range and changed combustion behavior in the vertical flame test.…”

Section: Introductionmentioning

confidence: 99%

Synergistic flame retardancy of solid acid, hindered N‐alkoxy amine, and halogen compound for polypropylene

Nakashima

Hosokawa

Ueno

2023

J of Applied Polymer Sci

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Polypropylene (PP) is a thermoplastic resin widely used in various industrial applications. However, the flammability of PP is a severe drawback that lowers operational safety. This study demonstrates the development of flame‐retardant PP. The co‐adding with various solid acids and a hindered N‐alkoxy amine (NOR116 – Flamestab® NOR 116 FF) affects the combustion behavior of PP in a vertical flame test. The co‐adding of silica alumina (SA) and NOR116 with PP promoted the melt drip, suppressed upward combustion heat, and shorter the combustion time. The decomposition products of NOR116 induced the cleavage of the main chain of PP, and it quenched the radicals on the surface of the SA particles because SA has abundant acidic sites and large pores, facilitating the adsorption of a substantial quantity of NOR116. The molecular weight of PP was controlled to 103 ~ 104 before the combustion to achieve an increase in the melt flow ability and suppress the upward combustion. Furthermore, a small amount of a halogen‐based flame retardant was incorporated into the PP/SA/NOR116 sample, and the specimens could instantly self‐extinguish on the gas phase by radical trap.

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“…[3][4] As the use of polymers become more widespread, flameresistant polymers must be developed for improved safety. 5 Hitherto, halogen compounds, 6 phosphate compounds, [7][8][9] silicone compounds, 10 hydroxides, 11 metal oxides, 12,13 and clay nanocomposites 14 have been developed as flame retardants. Further development of novel flame-retardant materials is necessary to reduce harm to the environment and humans 15 and improve recycling processes.…”

Section: Introductionmentioning

confidence: 99%

Image analysis of flame behavior for polyolefins and polystyrene in vertical flame test

Hosokawa

Nakashima

Ueno

2020

J of Applied Polymer Sci

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Although the UL-94 vertical flame test is often used to evaluate the flammability of polymers based on ignition time and combustion duration parameters, a significant amount of information regarding the time course of combustion is difficult to analyze in detail. Herein, image analysis of the time course of the upper and lower end heights, total area, and color division of flame was performed for polyolefins and polystyrene with different molecular weights in the vertical flame test. The combustion process was classified into two stages: before and after the first drip. In the first stage, the upward spread velocity, oscillation, and color of flame were analyzed. It was assumed that the difference in the fuel production rates or thermal decomposition products depends on the molecular structure. In the second stage, the melt flowability, flame position, and combustion continuity differed vastly depending on the molecular structure or molecular weight.

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Thermal degradation and flame retardancy of polynorbornene by a zeolite

Cited by 11 publications

References 8 publications

Homo‐ and Co‐Polymers of Norbornene Containing Aryl‐ and Hetaryl‐Azo Dyes; Synthesis and Sensing Properties

Homo‐ and Co‐Polymers of Norbornene Containing Aryl‐ and Hetaryl‐Azo Dyes; Synthesis and Sensing Properties

Synergistic flame retardancy of solid acid, hindered N‐alkoxy amine, and halogen compound for polypropylene

Image analysis of flame behavior for polyolefins and polystyrene in vertical flame test

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