chemistry

Vinyl polymer

Vinyl polymer is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Vinyl polymer rather than just read about it. In short: In polymer chemistry, vinyl polymers are a group of polymers derived from substituted vinyl (H2C=CHR) monomers. Their backbone is an extended alkane chain [−CH2−CHR−].

Key takeaways

Vinyl polymer belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Vinyl polymer to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Vinyl polymer from memory before moving on to harder problems.

Reference excerpt

In polymer chemistry, vinyl polymers are a group of polymers derived from substituted vinyl (H2C=CHR) monomers. Their backbone is an extended alkane chain [−CH2−CHR−]. In popular usage, "vinyl" refers only to polyvinyl chloride (PVC).

Examples Vinyl polymers are the most common type of plastic. Important examples can be distinguished by the R group in the monomer H2C=CHR:

Polyethylene (PE) is made from ethylene, R = H polypropylene (PP) is made from propylene, R = CH3 Polystyrene (PS) is made from styrene, R = C6H5 Polyvinyl chloride (PVC) is made from vinyl chloride, R = Cl Polyvinyl acetate (PVAc) is made from vinyl acetate, R = O2CCH3 Polyacrylonitrile (PAN) is made from acrylonitrile, R = CN

Production Vinyl polymers are produced using catalysts. Ziegler–Natta catalysts are used commercially for production of polyethylene and polypropylene. Many are produced using radical initiators which are produced from organic peroxides. Still others (polystyrene) are produced using anionic initiators such as butyl lithium. An exception from the usual rules, polyvinyl alcohol, (CH2CHOH)n, is produced by hydrolysis of polyvinyl acetate. Vinyl alcohol is not sufficiently stable to undergo polymerization.

Structure Vinyl polymers are subject of several structural variations, which greatly expands the range of polymers and their applications. With the exception of polyethylene, vinyl polymers can arise from head-to-tail linking of monomers, head-to-head combined with tail-to-tail, or a mixture of those two patterns. Additionally the substituted carbon center in such polymers is stereogenic (a "chiral center"), with the result that the relative absolute configurations of these centers within a polymer can influence the properties of the polymer. This feature is called tacticity. The polymerization conditions and the catalysts affect tacticity. Another major variation for vinyl polymers arises from the copolymerization of differing vinyl monomers. The simplest example is ethylene-propylene copolymer. The % comonomer is yet another variation.

Worked examples

Example 1 — a first encounter with Vinyl polymer

Start with the simplest possible case. Write down what Vinyl polymer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Vinyl polymer before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Vinyl polymer ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Vinyl polymer

In research: Vinyl polymer appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Vinyl polymer in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Vinyl polymer is common in secondary-school and first-year university syllabi. It links to neighbouring topics Organic polymers, Vinyl polymers, so understanding it makes those chapters shorter.
In everyday life: Look for Vinyl polymer outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Vinyl polymer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Vinyl polymer means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Vinyl polymer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Vinyl polymer in simple terms?

In polymer chemistry, vinyl polymers are a group of polymers derived from substituted vinyl (H2C=CHR) monomers. Their backbone is an extended alkane chain [−CH2−CHR−].

Why does Vinyl polymer matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Vinyl polymer?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Vinyl polymer.