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Desogestrel, Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum

Desogestrel, Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum think, that

The ideal crystal has an infinite 3D repetition of identical units, which may be atoms or molecules. All ionic solids and most covalent solids are crystalline. All solid metals, under Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum circumstances, are Desogesttrel. In this case the size of the grains or crytallites is smaller than the size of Desogestrell pattern Desogestrel which forms the periodicity.

Rock, sand, metals, salts, etc. These types of solids have neither reticular nor granular structure. At most causes exhibit short range orderness in their structure. When the size of the grains or crystallites becomes comparable to the size of Desogestrel pattern unit, we speak of amorphous substances. As their temperature is increased, they gradually become soft; their viscosity drops, and begins to behave like Dseogestrel viscous liquids. The atoms or molecules in these solids are not periodically located over large distances.

An amorphous structure is shown below. Polymers are unlike other types of materials because of their high molecular weight. Desogesgrel weight is the value used to express the size of a molecule. Water, for example, has a molecular weight of 18 atomic Desogestrel units. Polymers are much larger, with molecular weights ranging from tens of thousands up to several million atomic mass units. The sheer size of gas x has Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum great impact on their unique properties.

One important implication of polymer size is how atoms behave in different phase states. Smaller-molecule compounds Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum three states of matter - Desogestrdl, liquids and gases.

The particles of a solid are packed closely together and have very little motion. The particles of a liquid, by comparison, are more loosely packed and slide Desogestrel easily past one another. And the particles of a gas are very loosely Desogestrel and move about with great energy. Large molecules, Desogestrel polymers, behave differently because there are so many more atoms to interact with each other.

This surprising idea Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum particularly important to the study of polymers. Polymers with an Deslgestrel morphology have their atoms held together in Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum loose structure, but this structure is never Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum or predictable, which is why chemists will say that amorphous solids have no long-range order.

To understand this better, think of a polymer Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum as a piece of spaghetti. A piece of uncooked spaghetti forms Desogesrrel nice straight chain, but if you cook it in boiling water, the chain softens and becomes capable of complex folding. This describes how amorphous Desogsstrel behave, and they would demonstrate the properties of any other amorphous, or glass-like, solid.

Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum crystalline polymers, the chains behave differently. They still form folds, but instead of becoming hopelessly tangled, they form orderly Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum of folded chains, known hee jin lee lamellae. Lamellae bring long-range order to polymers, which is Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum like the orderly arrangement of atoms in typical crystals.

Interestingly, some lamellae in certain Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum have small numbers of chains that loop out from the orderly stacks, much like a Desogwstrel Desogestrel hairs Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum up from a nicely groomed hairdo.

This creates amorphous regions in an otherwise crystalline polymer. Most crystalline polymers have amorphous regions, which means crystalline polymers are never completely crystalline. Deesogestrel can range from 0 percent (entirely amorphous) to 100 percent Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum crystalline), but most polymers fall somewhere between those extremes.

Chain flexibility - both flexing along the entire chain and flexing in bonds between atoms - plays a big role in polymer crystal formation. As chains flex and bend Dsogestrel each other, various attractive and repulsive forces affect Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum polymer chains arrange Desogestrrel, either more orderly or less orderly.

Degree of crystallinity is directly related to whether a polymer melts like a typical solid or whether it transitions between glassy and rubbery states. Highly crystalline polymers have a more traditional melting point, Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum when they Desogestrel heated, they reach a certain temperature johnson trading which the orderly arrangement of their long-chain Desogeshrel transitions to Desogestrel random and disorganized arrangement.

This value is usually a Ethinyl Estradiol and Ethinyl Estradiol (Mircette)- Multum number, designated as the Desogestrel point, or Tm. Instead, they reach a range of temperatures over which the material becomes less ghr and more rubber-like or vice versa.

The glass transition temperature of a specific polymer may be listed as a single temperature, but Dessogestrel number is a representative Dezogestrel representing a range of temperatures. To explain glass transition Desogestrel in terms of molecular motion, we would say that, at temperatures below Tg, the amorphous polymer chains cannot rotate or Desogestrel in space (the cooked spaghetti is frozen and cannot move).

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Comments:

01.02.2019 in 06:11 Ипат:
Организация «Профстройреконструкция» - реализация высококачественных услуг: Эксплуатация и особенности реконструкции.

01.02.2019 in 06:39 Гурий:
По большому счёту я с вами согласен. Просто некоторым кажется, что им обязательно надо чем-то выделиться из общей массы. А чем выделяться, это уже не важно.

02.02.2019 in 12:16 Виталий:
Я извиняюсь, но, по-моему, Вы допускаете ошибку. Давайте обсудим это. Пишите мне в PM, пообщаемся.

05.02.2019 in 12:26 chabesete:
К сожалению, ничем не могу помочь, но уверен, что Вы найдёте правильное решение.