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The fourth approach is the simplest method to synthesize polyrotaxanes. Through mixing the main chain polymers and the rings in the solution, polyrotaxanes can be obtained after adding bulky stoppers to prevent the rings from dethreading from the chains. The number of rings on each chain depends on the threading equilibrium.
In chemistry, a retort stand, also called a clamp stand, [1] a ring stand, [2] or a support stand, [3] is a piece of scientific equipment intended to support other pieces of equipment and glassware — for instance, burettes, test tubes and flasks. [4] The typical ring stand consists of a heavy base and a vertical rod, both usually made of metal.
The Big Ring is composed of numerous galaxies and galaxy clusters that form a continuous, almost perfect ring-like pattern in space. With its diameter of 1.3 billion light years and a circumference of 4 billion light years, it is one of the largest known structures within the observable universe. The structure is made up of many galaxy clusters ...
This velvet zippered travel jewelry organizer is the perfect size to store rings, a few necklaces and earrings. ... This two-pack of wine stoppers is probably the most affordable wine accessory ...
Iron rings used in a laboratory. An iron ring or ring clamp is an item of laboratory equipment which comprises a conjoined metal ring and radially-extending rod. [1] In some cases, the rod terminates in a screw clamp for attachment to a retort stand or other support; in others, the rod may be attached to a stand by means of a laboratory clamp holder. [2]
Porcelain Wine Stopper Set. $28 at Rifle Paper Co. OXO Brew Rapid Brewer. $40 at Amazon. Custom Book Ornament. ... Whether she's rocking a new engagement ring or a family heirloom, every woman ...
There is a variant for half-letter size pages (8 + 1 ⁄ 2 by 5 + 1 ⁄ 2 inches or 220 mm × 140 mm), whose three rings are 2 + 3 ⁄ 4 inches (70 mm) apart. "Ledger" size binders hold 11-by-17-inch (28 by 43 cm) paper, and may use standard 3-ring spacing or multiple additional rings.
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