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At or near the final stages of production, the material is treated with a chain extender. Typically, chain extenders are bifunctional, i.e., they have two functional groups, which can link together two polymers. Representative classes of chain extenders are diglycidyl ethers, diols, diamines, or dianhydrides. Chain extenders are often applied ...
TPU is a block copolymer consisting of alternating sequences of hard and soft segments or domains formed by the reaction of (1) diisocyanates with short-chain diols (so-called chain extenders) and (2) diisocyanates with long-chain diols. By varying the ratio, structure and/or molecular weight of the reaction compounds, an enormous variety of ...
A screen protector, yet to be installed A smartphone with a screen protector installed. A screen protector is an additional sheet of material—commonly polyurethane or laminated glass—that can be attached to the screen of an electronic device and protect it against physical damage.
Pouch case made to dangle A Samsung Galaxy S8 Active in a combined case and collapsible vertical stand S-View cover accessory of a Samsung Galaxy S4 - Horizontal flip cover with preview window . Cases, which are designed to attach to, support, or otherwise hold a smartphone, are popular accessories.
In polymer chemistry, chain transfer is a polymerization reaction by which the activity of a growing polymer chain is transferred to another molecule: [1] [2] + + where • is the active center, P is the initial polymer chain, X is the end group, and R is the substituent to which the active center is transferred.
Sales at the company's specialty materials business, which houses the Gorilla Glass product used in smartphones, fell 6% year-on-year. Corning forecasts weak quarterly profit on lower demand for ...
Android 13 is the thirteenth major release and the 20th version of Android, the mobile operating system developed by the Open Handset Alliance led by Google. It was released to the public and the Android Open Source Project (AOSP) on August 15, 2022. [2] The first devices to ship with Android 13 were the Pixel 7 and 7 Pro.
SCCPs (average chain length of C 12, chlorination degree 60 wt%) were categorised in group 2B as possibly carcinogenic to humans from the International Agency for Research on Cancer (IARC). [15] In 2017, it was agreed to globally ban SCCPs under the Stockholm Convention on Persistent Organic Pollutants , effective December 2018.