دانلود رایگان مقاله لاتین اسلب پلی متیل متاکریلات از سایت الزویر
عنوان فارسی مقاله:
مطالعات تجربی در مورد اثر فاصله بر رفتار چکیدن اسلب پلی متیل متاکریلات
عنوان انگلیسی مقاله:
Experimental studies on the effects of spacing on dripping behavior of thin polymethyl-methacrylate slab
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Thermoplastic polymethyl-methacrylate (PMMA), one of the best organic synthetic materials, has been widely used in interior decoration and insulation industries [1]. Therefore, many vertical walls are covered by large thermally thin PMMA materials, not only to beautify the environment, but also to ensure that the wall is not damaged. However, the potential hazards of these thermoplastics in fires are a matter of great concern. For instance, the dripping of burning polymers has been recognized as a great threat to the public, which can accelerate fire growth and spread fires between nonadjacent objects. When thermally thin PMMA materials are set in a vertical orientation, the molten materials drip because of the high mobility triggered by increasing temperature [2]. In the fire research community, many researchers [2–8] investigated the dripping behavior of burning thermoplastic materials. Wang et al. [2–4] carried out small-scale experiments for the dripping behavior of PMMA under the UL94 vertical test conditions [9]. The results indicate that flame spread and burning rate affect the dripping behavior of thermally thin PMMA materials. Under the UL94 vertical test conditions, the dripping behavior was categorized into two different types: small and uniform drops with a short first dripping time, and large and irregular drops with a long first dripping time. The activation energy of viscous flow and the ratio of the effective heat of combustion to the heat of gasification were also important properties of materials dominating the dripping types of polymers [2]. Regarding the factors influencing the dripping, it can be attributed to the reduction of viscosity not only due to physical melting, but also chemical degradation [2,3,7]. Xie et al. [5] demonstrated that a thinner thermoplastic sheet dropped faster and reached the peak heat release rate earlier than a thicker thermoplastic sheet. A thermally thick PMMA sheet exhibited softening, distortion, and surface
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کلمات کلیدی:
Experimental studies on the effects of spacing on dripping behavior of ... isi-dl.com/item/136310 Experimental studies on the effects of spacing on dripping behavior of thin polymethyl-methacrylate slab. sciencedirect.com ... Experimental studies on the effects of spacing on dripping behavior of ... https://www.infona.pl/.../bwmeta1.element.elsevier-44e97165-1019-333b-9fe2-eee3828... by H Zhu - 2016 - Cited by 1 - Related articles In this study, the dripping behavior was investigated using uniform PMMA ... on the effects of spacing on dripping behavior of thin polymethyl-methacrylate slab. 11. Experimental studies on the effects of spacing on dripping ... - 首页 en.ahau.findplus.cn/?h=articles&db=edselc&an=edselc.2... Translate this page Title: Experimental studies on the effects of spacing on dripping behavior of thin polymethyl-methacrylate slab. Authors: Zhu, H. Gao, Y. Zhu, G. Affiliation: School ... Materials | Special Issue : Influence of Thermo-Physical and Thermo ... www.mdpi.com/journal/materials/special_issues/behavior-polymers Finally, modeling the fire behavior of materials provides insight into the .... of Flame Retardants on the Melt Dripping Behaviour of Thermoplastic Polymers .... a dynamically evolving insulation layer is produced from an initially thin coating. ... 90° on pilot and non-pilot ignition of PMMA (poly(methyl methacrylate)) exposed to ... Experimental Studies on the Effects of Spacing on Upward Flame ... https://www.springerprofessional.de/experimental-studies-on-the...of.../11716468 Apr 12, 2016 - ... of spacing between wall and thin fuels on upward flame spread. ... (2) At an infinite length of PMMA, the pyrolysis zone and pyrolysis ... using 1 mm thick PMMA sheets, including two-face burning case. .... Wang Y, Zhang F, Chen XL, Jin Y, Zhang J (2010) Burning and dripping behaviors of polymers under ... Effect of Melting Behaviour on Upward Flame Spread of ... onlinelibrary.wiley.com/.../(SICI)1099-1018(199701)21:1%3C1::AID-FAM583%3E... by J Zhang - 1997 - Cited by 57 - Related articles The effect of melting behaviour on upward flame spread of thermoplastic materials when subjected to small ignition sources and considered to suffer no external ...
