branched polymer


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branched polymer

[¦brancht ′päl·ə·mər]
(organic chemistry)
A polymer chain having branch points that connect three or more chain segments; examples include graft copolymers, star polymers, comb polymers, and dendritic polymers.
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g] and [[eta]] will result for a long chain branched polymer compared with its linear counterpart of the same MW.
Homogeneous long-chain branched polymer can have benefits for collapse resistance (high low shear viscosity) and easy dispersion mixing (low high shear viscosity) to result in excellent extrusion processability (fast throughput and minimal melt fracture) which leads to higher surface quality and product consistency.
PPG Industries has received a patent for a compound that is comprised of the reaction product of a highly branched polymer having terminal amine functional groups and a lactam, wherein the highly branched polymer is the step-growth polymerization reaction product of a polyfunctional first monomer having a first functional group and a polyfunctional second monomer having a second functional group wherein the first and second functional groups will react with each other but not themselves, wherein formation of the highly branched polymer is free of self-condensation of the polyfunctional first monomer, and free of self-condensation of the polyfunctional second monomer.
n] is calculated from the ratio of intrinsic viscosity of the branched polymer fraction (having random, trifunctional polydisperse structure) to the corresponding linear polymer fraction.
The major active ingredient of most chemical peptizers is DBD, which acts to terminate the broken chains before they can react to form branched polymer.
One of the ways to calculate the MWD for branched polymer is numerical fractionation, where the whole polymer population is classified into number of classes based on the number of branches [10] (e.
The new molecule - a lacy, branched polymer known as a dendrimer - has a precisely defined structure and can be produced in surprisingly uniform batches, says Jeffrey S.
For both Miles and Hoechst Celanese, toughness is one advantage of polymerization processes that produce a more linear rather than branched polymer.
However, in branched polymers, the reptation of molecules is inhibited by the presence of branch points; hence, branched polymer chains relax by fluctuations and constraint release (16).
The possible reason could be that branched polymer is denser than linear polymers, and hence, has lower volume fraction of free space per unit volume of the polymer, which reduces the survival rate of micro voids, and therefore, impedes nucleation.
Note that a branched polymer is exceptional in that which can simultaneously have enhanced melt tension while still exhibiting shear thinning (27).
6] Da and the highly branched polymer called amylopectin with an average molecular weight of [10.

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