percentage yield increased with increase in polymer concentration from 88.3 to 93.6%. Stirring speed does not show any valid effect in the percentage of yield. Particle size increased with increase in the polymer concentration due to the viscosity character of the polymer which comes in contact with the drug to form microparticles. The particle size decreased with increase in stirring speed. Encapsulation efficiency was increased with the increase in polymer to drug ratio. Since the drug is well soluble
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strong. Because the polymer Kevlar forms chains like structures‚ its crystallinity‚ the way the polymer is arranged and stacked is like stacking wood in nice tightly packed bundles. To explain the incredibly strong intermolecular forces of the hydrogen bonds I would compare it to a magnet‚ the chains are attracted to each other like the attraction between magnets and their hard to pull apart. 2. Provide three chemical reasons why Kevlar is much stronger than other polymers * On reason Kevlar
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molecules (polymers) composed of thousands of covalently connected (monomers). • Everything is made of atoms molecules macromolecules. Macromolecules are polymers‚ built from monomers • A polymer is a long molecule consisting of many similar building blocks. • These small building-block molecules are called monomers. • Three of the four classes of life’s organic molecules are polymers: – Carbohydrates – Proteins – Nucleic acids The Synthesis and Breakdown of Polymers • A dehydration
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Laboratory‚ including single-molecule logic gates. Apart from the Aviram and Ratner proposal‚ molecular electronics received an initial boost from the experimental discovery of conducting polymers in the mid-seventies. Before this date‚ organic molecules (which form crystals or polymers) were considered insulating or at best weakly conducting semi-conductors. In 1974‚ McGinness‚ Corry‚ and Proctor reported the first molecular electronic device in the journal Science. As its active
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During this modeling experiment‚ it was observed that that the efficiency of the Enzyme over time created a line like that of a radical function. This was true for almost every trial‚ as when there were less and less polymers to break down; the enzyme had trouble locating polymers that had not already been broken. This is especially noticeable in the trials in which the enzyme(s) had a high
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--------------------------------------------- Macromolecules are polymers‚ built from monomers - Carbohydrates‚ proteins‚ and nucleic acids are all chain-like molecules called Polymers Polymer- is a long molecule consisting of many similar or identical building blocks linked by covalent bonds. Example: Much as a train consists of a chain of cars. Monomer- A subunit that serves as the building block of a polymer -Some molecules that serve as monomers also have other functions of
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possible solutions to prevent this potentially economical and ecological quagmire from taking place. One viable solution is to introduce superabsorbent polymers into the soil used for agriculture‚ which can drastically reduce the chances of another major drought like the one in the 1930s. Today I will be sharing with you what super absorbent polymers are‚ how they support the soil and plants‚ and how they can be
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To%generate%the%biodegradable%polymer‚%poly%(lacticLcoLglycolic%acid)%(PLGA)‚%a%continuous%production% method% is% used% including% an% aluminum% isopropoxide% catalyst.% % Since% the% catalyst% is% potentially% toxic% to% human% cells‚% it% needs% to% be% rinsed% from% the% polymer% solution.% After% processing‚% the% polymer% stream% is% washed%into% a%single%wash%unit% with%the%solvent%methylene%chloride.%% Assume%the%unprocessed%polymer% solution%contains% 40.0%wt%%polymer‚%10.0%wt%%catalyst‚%and%
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surface. (To prepare a solid dispersion‚ equal quantities of the γ form of indomethacin and a polymer were weighed. The amounts were mixed in a mortar and pestle to obtain a homogeneous mixture of indomethacin and polymer at a 1:1 ratio (w/w). This mixture was spread on an aluminium pan‚ heated at 165 °C and cooled down as described before in the procedure to prepare amorphous indomethacin. The polymers used in this study are Soluplus® and HPMC.) 1.2.2. Solid state characterization 1.2.2.1. Infrared
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measure the intrinsic viscosity of the prepared polystyrene. Intrinsic viscosity‚ which is measured from the flow time of a solution through a simple glass capillary‚ has considerable historical importance for establishing the very existence of polymer molecules. The aim of this lab is to estimate the molecular weight of a polystyrene sample by dilute viscometer. The viscosity average molecular weight is determined for polystyrene obtained from bulk process and solution process. The result molecular
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