طبقه بندی: متفرقه،
برچسب ها: مطلب ثابت، update، مهندسان، اساتید، دانش آموزان، دانشجویان،
TYPES OF POLYMER CONCRETE:
1. Polymer impregnated concrete (PIC).
2. Polymer cement concrete (PCC).
3. Polymer concrete (PC).
ADVANTAGES OF POLYMER CONCRETE:
1. It has high impact resistance and high compressive strength.
طبقه بندی: کامپوزیت، اطلاعات پلیمری، کاربرد مهندسی پلیمر،
برچسب ها: POLYMER CONCRETE، POLYMER، CONCRETE،
Bottle caps are removed and discarded prior to the recycling of plastic or glass bottles and most refuse companies require you to remove the bottle cap before putting the bottle in your recycling box.
Plastic bottles are made from either polyethylene terephthalate (plastic #1) or high density polyethylene (plastic #2) but the plastic caps themselves can be made from high density polyethylene (plastic #2), low density polyethylene (plastic #4) or most often from polypropylene (plastic #5).
The polyethylene caps are the caps that you can deform easily if you squeeze or bend them with your fingers. These can be included with the plastic bottles in your recycling collection. An example of a polyethylene cap, is the flat cap commonly found on the top of plastic milk jugs. These caps push on to the top of the bottle rather than having a screw thread. Caps with a screw thread are usually made from polypropylene.
Polypropylene caps are much harder and more rigid than polyethylene caps, often with a screw on thread, and should not be included in your curbside recycling collection. If you try to bend these caps with your fingers the plastic will only bend a small amount. Polypropylene cap examples are detergent bottle caps, screw caps on soda, water bottles and toothpaste tubes or the flip top caps on shampoo bottles or other cosmetics products.
If you are not sure what type of plastic the cap is made from then place the cap in your general trash and recycle just the bottle.
طبقه بندی: پلاستیک ها،
برچسب ها: Bottle Caps، Bottle، Caps، plastic، pp، polymer،
Nanostructured and Functionalized Materials & Devices
Materials for biomedical applications
Molecular functionalization techniques are used to tailor substrates for biomedical applications. Examples include microbicidal surfaces which inhibit biofilm formation; high strength bone cements with bactericidal biopolymers or antibiotic-conjugated monomers which achieved higher antibacterial efficacy longer than the present cements; and magnetic nanoparticles for bioimaging and tumor targeting. In a separate development, the adsorption disruption of oriented liquid crystal molecules on a patterned surface was developed into a new label-free optical method for the simultaneous detection of multiple glycine oilgomers using sample size as little as 2 μL.
Materials for energy applications
Research in energy is focused on the design and synthesis of new and alternative materials for energy supply, transformation, storage, delivery and end-use. There are strong coordinated efforts in developing catalysts for fuel production, and for the non-oil based route to chemicals production. Ceramic membranes are used to produce oxygen from air. Electrochemical energy conversion is another focused research area covering a number of technological areas: anode materials for lithium-ion batteries, catalysts and polymer electrolyte membranes for direct alcohols fuel cells, and materials for supercapacitors.
Materials for optoelectronic applications
Many optical devices based on 3D photonic crystals, such as optical switches, low-threshold lasers and light-emitting diodes, and waveguide, require the exact placement of artificial defects embedded in the interior of the photonic crystals. We have recently embedded artificial line-defects in a 3D photonic crystal using a combination of “bottom-up” self-assembly method and the conventional “top-down” technique. The new technique circumvents some of the problems in the self-assembly approach to fabricating functional photonic devices from photonic crystals.
Polymer and molecular electronics
Molecular memories based on polymers and organic materials have the advantages of simplicity in structure, drive-free read and write capability, good scalability, 3-D stacking ability, low-cost potential, and a large capacity for data storage. By combining molecular design with novel synthesis approaches, several polymer/molecular memories, including flash (rewritable) memory, write-once read-many-times (WORM) memory and dynamic random access memory (DRAM) have been realized. All these devices exhibit stable states with high ON/OFF current ratios (104-107), and perform up to 108 read cycles under ambient conditions.
Self-assembly of nanomaterials
A real-world functional material (e.g. solid catalyst) is a highly organized multi-component materials system. This modern view calls for the development of new strategies promoting the self-assembly of various functional components. For example, catalytic metals such as Au and Co can be introduced to the exterior surfaces or interior spaces of photosensitized metal oxide systems to enhance their functions as preparative nano-reactors. In another development colloidal and interfacial polymerizations are used to produce hydrophilic-lipophilic polymer composite membranes for separation; and micro-spheres and porous continuous media for catalyst immobilization and storage of energetic materials.
reference : http://www.chbe.nus.edu.sg/research/materials#
برچسب ها: materials، polymers، material، nanomaterials، nano،
سمینار بررسی خواص فیزیکی و مکانیکی آلیاژهای نانو کامپوزیت پلی لاکتیک اسید
What Can I Recycle
Nanostructured and Functionalized Materials & Devices
Properties Of Graphene
The story of Graphene
New building materials for the future of construction
What Are Synthetic Polymers
What Are Polymers
?What Is Carbon
سایت ماه اسکین طراح قالب وبلاگ رایگان با امکانات عالی