Polymer Tacticity
Polymer Tacticity - Related Videos
01:20
Pricing Tactics I
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2024
Pricing tactics are short-term strategies businesses use to sell their offerings to meet specific objectives such as boosting sales, attracting new customers, or clearing out inventory. These tactics are: • Markdown: is a pricing tactic where retailers reduce the selling price of a product, typically to clear out old inventory or make room for new items. It is common in fashion retailing and electronics, where product life cycles are short. • Quantity Discounts: offer a reduced price per...
01:28
Pricing Tactics II
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2024
Some more pricing tactics include the following. Rebate Pricing involves offering customers a partial refund after they have purchased a product and completed an additional step, like mailing in a coupon or form. Rebates incentivize sales by lowering the net price. Lease or Rentals make products or services more accessible to consumers. Instead of selling a product outright, companies can lease or rent it for a periodic fee—for example, car rentals. Price bundling is where businesses sell...
01:30
Defensive Tactics
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2026
Defensive tactics are strategies companies employ to resist unwanted takeovers and protect their autonomy. These methods deter hostile bidders or improve acquisition terms, enabling companies to maintain control over their direction. Common strategies include the Poison Pill, Shark Repellent, Golden Parachute, and White Knight.The Poison Pill allows shareholders to purchase additional stock at a discount, diluting the acquirer’s stake and making the takeover more expensive. For instance,...
02:34
Polymers
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2020
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
08:44
Tension Tests of Polymers
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Polymeric materials are widely used in civil structures, with uses ranging from very soft sealants to more rigid pipes in water and wastewater systems. The most basic definition of a polymer is a molecular structure with repeating subunits. The term polymer comes from Greek, where "poly" means many, and "-mer" means basic unit. Monomers, or single mers, are the specific repeating units. With...
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These factors determine how each monomer is incorporated and how its substituent is oriented relative to neighboring units. Monomer structure establishes the possible stereochemical arrangements, while the catalyst and reaction conditions can influence which configuration forms during polymerization. Adjusting these variables allows chemists to favor more regular or less regular chains and thereby tune the resulting material.
Regular stereochemical patterns can help polymer chains pack more efficiently, whereas irregular arrangements can disrupt close packing. This difference affects crystallinity, which in turn influences stiffness, transparency, thermal behavior, and mechanical performance. Consequently, tacticity provides a molecular-level way to connect the arrangement of substituents along a chain with observable bulk properties.
Isotactic and syndiotactic arrangements provide more organized patterns than atactic arrangements, although the two ordered patterns differ in how substituent orientations are distributed along the chain. Atactic chains have less regular organization, which can alter packing and chain motion. These contrasts help explain differences in crystallinity, flexibility, melting behavior, and overall mechanical response.
Control begins with selecting a suitable monomer structure, catalyst, and set of reaction conditions that influence the configuration of successive repeating units. Chemists then relate the resulting stereochemical pattern to properties such as crystallinity, glass-transition behavior, melting behavior, and mechanical performance. This design approach supports preparation of polymers with targeted combinations of strength, transparency, stability, and processability.
Tacticity becomes important when a polymer must meet specific requirements for strength, flexibility, transparency, thermal stability, or ease of processing. Changing the stereochemical pattern can modify several of these characteristics at once because packing and chain motion respond to substituent arrangement. Chemists therefore consider tacticity when developing materials for packaging and advanced engineering applications.
Adjusting the arrangement of substituent groups can change crystallinity, chain flexibility, glass-transition behavior, melting behavior, and mechanical performance. These changes provide a route to balance properties rather than treating them as fixed features of a polymer family. In chemistry research, that relationship supports rational material design for different performance and processing requirements.