دانلود رایگان مقاله لاتین کامپوزیت اپوکسی با لوله پلی پروپیلن از سایت الزویر
عنوان فارسی مقاله:
شیشه الیاف خود ترمیم/ کامپوزیت اپوکسی با لوله های پلی پروپیلن جهت اپوکسی خود تحت فشار و عوامل ترمیم مرکاپتان
عنوان انگلیسی مقاله:
Self-healing glass fiber/epoxy composites with polypropylene tubes containing self-pressurized epoxy and mercaptan healing agents
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Extrinsic self-healing approaches for polymers based on embedded healing agent have attracted substantial interests [1] because chemical structures of the target materials do not need to be changed, which is different from most of intrinsic self-healing systems [2]. Among the available vessels that hold healing agent, micropipelines [3] are capable of storing/providing larger amount of healing agent and sometimes allow for multiple healing function through connection with external supply as compared to microcapsules [4]. Accordingly, a variety of micropipeline configurations have been proposed, including hollow glass tube [5e9], hollow glass fiber [9e14], hollow carbon fiber [15], hollow polymer tube [16,17], and hollow metallic tube [18]. Moreover, microvascular networks were also created by incorporating pre-made microchannels [19e23] or removing pre-loaded microperforms [24e27] from the composites. They proved to work in different composites in terms of mechanical properties restoration. It is worth noting that flowability of the released healing agent inside materials upon damage is a key issue no matter which type of micropipelines are applied. It determines whether the healing agent can be delivered to the cracked sites and the envisaged healing reaction can be effectively triggered (for two-component healant system). In fact, capillary effect, the main driving factor of healing fluid in self-healing materials with microcracks, becomes rather weak for fiber composites with open fracture [11e13,28e30]. Moreover, the cracks in fiber composites are rather complicated, which may curve and interconnected. Therefore, improvement of flowability of healing agent becomes a very important issue. Otherwise, overlong healing duration or lower healing efficiency would be observed. In extreme situation, for example, the process of healing may even last 12 months [5]. To solve the problem, assistant measures based on manual intervention, such as evacuation [13], heating [11,28,29], dilution with solvent [13,30] and external pressurization [17,24], were used during healing. The authors of the present paper suggest a novel method by mixing a foaming agent with the encapsulated healing agent. So long as it takes effect, internal pressure is greatly increased and the healing agent would burst out of the reservoir soon after breakage. This self-pressurized system can improve flowability of the healing agent free of manual intervention. More interestingly, the healing agent filled micropipelines might thus be less dense, favoring maintaining original properties of the composites to a higher extent.Hereinafter a proof-of-concept glass fiber/epoxy composite is prepared and verified accordingly, in which polypropylene (PP) tubes respectively filled with epoxy and mercaptan as healing components are incorporated. The healing agent has already shown its ability of crack remending of cured epoxy when it is included in microcapsules [31,32]. The PP tubing is selected as micro-container not only because of easy realization of large-scale production, but also owing to the following potential expansibility and advantages (Fig. 1(a)). (i) Healing chemicals can be easily filled into larger size tubes first, and then the tubes size can be reduced by thermal stretching. This would avoid the difficulty of introducing healing agent into small size tubes, while eventually lead to less deterioration of composites mechanical properties as compared to the larger size tubes. (ii) The healing agent-loaded PP tubes can be converted into compartmented versions [33] by, for example, ultrasonic welding. This would help to realize repeated self-healing. (iii) The PP tubes containing healing agent can be purposely deformed due to their flexible nature, so that they can be knitted together with conventional reinforcing fibers. This may favor fabrication of self-healing structural composite with complicated shapes. (iv) Surface of the PP tubes can be modified by physical or chemical techniques, so that the interfacial interaction in composites could be improved. (v) The chemical inertness of PP ensures that it would not react with the included healing agent. The current work is the first step of our project concerning selfhealing composites based on polymeric micropipelines. The main factors that influence rehabilitation efficiency of the fiber composites with self-pressurized healing system, including tube spacing, content of foaming agent, foaming time, etc., are discussed.
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کلمات کلیدی:
PDF]Development of Composites with a Self-Healing Function matsc.ktu.lt/index.php/MatSc/article/download/5354/6113 by A ANISKEVICH - 2015 - Cited by 2 - Related articles Using flexible polytetrafluoroethylene tubes as removable preforms, the ... Keywords: smart composites, epoxy matrix, self-healing, vascular approach. 1. ... factors (pressure, temperature, moisture, etc.) ... example hard elastic polypropylene, possess the ability to ... NM 275A additionally containing 20 % vol. surfactant. Self-Healing Epoxy Composite with Heat-Resistant Healant - ACS ... pubs.acs.org/doi/abs/10.1021/am201182j by YC Yuan - 2011 - Cited by 36 - Related articles Oct 12, 2011 - Self-healing glass fiber/epoxy composites with polypropylene tubes containing self-pressurized epoxy and mercaptan healing agents. Self-Healing Materials Systems: Overview of Major Approaches and ... https://www.hindawi.com/journals/amse/2012/854203/ by B Aïssa - 2012 - Cited by 50 - Related articles Nov 25, 2011 - When polymer composites used as structural materials become damaged, ... after an application of a specific stimulus (e.g., heat, radiation, pressure, etc.) ..... kind of application, as opposed to polymer tubes or those made of metal, .... In the majority of self-healing composite systems that have been studied, ... [PDF]Self-Healing Polymers and Composites - Sottos Research Group sottosgroup.beckman.illinois.edu/nrs098.pdf by BJ Blaiszik - 2010 - Cited by 558 - Related articles Jul 13, 2010 - Self-healing polymers and fiber-reinforced polymer composites possess the ... some external energy or pressure. .... The first overview of self-healing materials in 2007 (1) contained multiple chapters written ..... components of a two-part epoxy system, with polyvinyl chloride tubes acting as major vessels in. [PDF]Setup of Extruded Cementitious Hollow Tubes as Containing ... - MDPI www.mdpi.com/1996-1944/8/4/1897/pdf by A Formia - 2015 - Cited by 8 - Related articles Apr 21, 2015 - Containing/Releasing Devices in Self-Healing Systems ... composites using extruded cementitious hollow tubes as containing/releasing devices for .... pressure forces caused by the sealed ends [1]. ... to a cement matrix, if exhibiting a plastic behavior, may enhance the deformability of the composite. Three-Dimensional Microvascular Fiber-Reinforced Composites ... onlinelibrary.wiley.com/doi/10.1002/adma.201100933/abstract Jul 15, 2011 - A method for fabricating microvascular networks in fiber-reinforced composites is presented. The method relies on sacrificial fibers woven into ...
