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Smart rubber will recover its original mechanical strength within several hours of being split and then subsequently recombined. Residual hydrogen bond donors and acceptors responsible for the self-healing properties of the elastomer remain unpaired until the newly exposed surface comes in contact with another complementary surface, allowing formation of new intermolecular hydrogen bonds.
Although the most common types of self-healing materials are polymers or elastomers, self-healing covers all classes of materials, including metals, ceramics, and cementitious materials. Healing mechanisms vary from an instrinsic repair of the material to the addition of a repair agent contained in a microscopic vessel.
The fulcrum is an inflatable rubber ball. The fulcrum is a solid urethane ball. A sphere, either an inflatable rubber ball (such as a basketball) or a solid polyurethane ball, is the fulcrum on which the board is balanced, and the fulcrum is kept contained under the board by a guard rail or ring on the underside. By redistributing his/her ...
[1] [6] Grade school-age children make and swap their rubber-band bracelets in the same way as friendship bracelets, and children have posted thousands of their own instructional videos online. [ 1 ] [ 2 ] [ 6 ] As of October 2013, Rainbow Loom's YouTube channel featured 66 how-to videos and had received nearly 4 million views. [ 2 ]
A bulletin board which combines a pinboard (corkboard) and writing surface is known as a combination bulletin board. Bulletin boards can also be entirely in the digital domain and placed on computer networks so people can leave and erase messages for other people to read and see, as in a bulletin board system.
Self-healing refers to the process of recovery (generally from psychological disturbances, trauma, etc.), motivated by and directed by the patient, guided often only by instinct. Such a process encounters mixed fortunes due to its amateur nature, although self-motivation is a major asset.
Canite, also known as caneboard, pinboard or softboard, is a low-density fibreboard panel made from sugar cane fibres. It is easy to handle, lightweight and relatively durable. Because of its low environmental footprint it is considered a sustainable building product.
During World War II, Japan invaded rubber-producing countries as it expanded its sphere of influence in the Pacific Rim. Rubber was vital for the production of rafts, tires, vehicle and aircraft parts, gas masks, and boots. In the US, all rubber products were rationed; citizens were encouraged to make their rubber products last until the end of ...