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Number-average molecular weight of a polypropylene is 1000000 gmol Compute the number-average degree of polymerization?
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∙ 13y ago
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∙ 13y ago
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Compute the degree of polymerization of polystyrene?
The degree of polymerization(n) is the ratio between Molecular weight(M) and the molar mass of the repeating unit in a polymer(m). M=n*m The molar mass(m) of the monomer (styrene) is 104.15 grams/mol if you are given a Molecular weight, just devide by m, and you've got it!
Is polypropylene a solid?
Any substance with a sufficiently large average molecular weight to be called "polypropylene" under normal circumstances is a solid at standard temperature and pressure. However, note that some hydrocarbons, such as hexenes, that could be formed by condensing small numbers of polypropylene molecules, are not solids at standard temperature and pressure.
Large carbon molecules are built from smaller simpler molecules called?
The phenomena of formation of large carbon compounds by the addition of small molecules is called polymerization and the molecules are come under macromolecules as they possess molecular weight several to hundred thousands
Is glucose molecular or ionic?
Molecular and covalent.
Is the molecular formula of sulfur dioxide ionic or molecular?
Molecular
Compute the degree of polymerization of polystyrene?
The degree of polymerization(n) is the ratio between Molecular weight(M) and the molar mass of the repeating unit in a polymer(m). M=n*m The molar mass(m) of the monomer (styrene) is 104.15 grams/mol if you are given a Molecular weight, just devide by m, and you've got it!
Is polypropylene a solid?
Any substance with a sufficiently large average molecular weight to be called "polypropylene" under normal circumstances is a solid at standard temperature and pressure. However, note that some hydrocarbons, such as hexenes, that could be formed by condensing small numbers of polypropylene molecules, are not solids at standard temperature and pressure.
What is the molecular weight of Chlorinated polyvinyl chloride resin?
Molecular weight of a polymer depends rather on it's degree of polymerization (chain length) than on it's composition. Typical polymer molecular weights are in the range of 1000 to 1000 000 and beyond.
What is the suitable organic solvent for polystyrene?
It depends on the molecular weight and 3-D structure of the polymer.
What are some physical properties of a plastic bag?
Most LDPE, MDPE and HDPE grades have excellent chemical resistance, meaning that it is not attacked by strong acids or strong bases. It is also resistant to gentle oxidants and reducing agents. Polyethylene burns slowly with a blue flame having a yellow tip and gives off an odour of paraffin. The material continues burning on removal of the flame source and produces a drip. Crystalline samples do not dissolve at room temperature. Polyethylene (other than cross-linked polyethylene) usually can be dissolved at elevated temperatures in aromatic hydrocarbons such as toluene or xylene, or in chlorinated solvents such as trichloroethane or trichlorobenzene
What are some examples of chemical change and properties?
Chemical changes: oxydation, reduction, thermal decomposition, synthesis, bromination, polymerization, etc. Chemical properties: flammability, corrosion, stability, molecular configuration, reactivity, etc.
What part of the amino acid gives the molecule its characteristic chemical properties?
Its unique sidegroup, also called its radical (often indicated as an R in molecular diagrams). The common amino acid backbone only allows polymerization of these monomers into protein molecules.
What is Polydispersity?
In organic chemistry, the polydispersity index (PDI), is a measure of the distribution of molecular mass in a given polymer sample. The PDI calculated is the weight average molecular weight divided by the number average molecular weight. It indicates the distribution of individual molecular masses in a batch of polymers. The PDI has a value always greater than 1, but as the polymer chains approach uniform chain length, the PDI approaches unity (1). For some natural polymers PDI is almost taken as unity. The PDI from polymerization is often denoted as: \ PDI = M_w/M_n
Large carbon molecules are built from smaller simpler molecules called?
The phenomena of formation of large carbon compounds by the addition of small molecules is called polymerization and the molecules are come under macromolecules as they possess molecular weight several to hundred thousands
What is the meaning of PPR material?
Polypropylene random copolymer is what PPR material is. The acronym refers to material that is high in molecular weight, low in melt flow rates, and strong in flexibility. It particularly will be found used in fittings and pipes even though sheeting is another possible use.
What is the difference between nylon and polypropylene?
There are many types of nylon, but they all are polyamides of relatively low molecular weight (at least compared to PE and PP). Generally they are manufactured by reaction of diacids and diamines, although there are other useful methods. Nylons have strong interchain interactions which result in very strong tensile strengths（抗拉强度）. For that reason their use is primarily in fibers.PP is polypropylene. It is chemically similar to PE but is made from the monomer propylene (CH3CH=CH2). This can be prepared from fewer reactions than PE, but it is much tougher and stronger than PE, even after molding, because it has more self-crystallizing capacity. A lot of consumer goods are made from PP for this reason.
Is CBr4 ionic or molecular?
Iron(III) bromide is an ionic compound.
