Overview
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance, acrylonitrile, vinyl chloride, styrene, with one electron-withdrawing group, and methyl-α-cyanoacrylate, with two electron-withdrawing groups, are suitable monomers for anionic polymerization. The electron-withdrawing groups of the monomer stabilize the carbanion generated during the polymerization process. The polymerization of acrylonitrile, vinyl chloride, and styrene yields anionic polymers such as polyacrylonitrile, poly(vinyl chloride), and polystyrene. Polyacrylonitrile is used in knitted clothes as fibers, and globally it is popular under the trade names Orlon, Creslan, and Acrilan. Poly(vinyl chloride) finds application in shower curtains, garbage bags, and water pipes. Polystyrene is widely used for making foamed cups and disposable food containers.…
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Embed code vs URL
An embed code allows you to place a JoVE video directly inside of your learning or training environment. Most learning management systems such as Canvas, Blackboard, and Moodle require an embed code for JoVE content to stream.
A URL allows you to place a link in programs such as PowerPoint or Microsoft Word which takes a user to a separate page where they can watch a JoVE video.
Most of the time, you will want to use the embed code. However, there are some environments that don’t support embed codes such as Google Classrooms and MS Teams. In those instances, you can use a URL to still provide access to JoVE videos.
What is an Embed Code?
Basically, it’s a snippet of code that you put on your website that displays as a video. An embed code pulls the video from the original source, allowing you to display a video without having to host the file on your website.
How to embed a video
STEP 1: COPY YOUR EMBED CODE
To generate the embed code, simply click the Copy button above. You can customize it by choosing a specific language for the video, or setting exact dimensions for the video player.
STEP 2: PASTE THE EMBED CODE INTO YOUR ENVIRONMENT
Embed codes can be used in most learning management systems (Canvas, Blackboard, Moodle…), organizational websites, and a host of other tools. The specifics of how to add in an embed code will depend on your environment.
Generally, it involves accessing a text editor, entering the HTML mode on the editor, and pasting in the embed code. Get more details on embedding into specific environments here.