how does the addition of a plasticizer influence the tensile strength of a polymer? why?
954622
Definition: A material of lower molecular weight added to a polymer to separate the molecular chains. This results in a depression of the glass-transition temperature, reduced stiffness and brittleness, and improved processability. Most plasticizers are nonvolatile organic liquids or low-melting point solids, which function by reducing the normal intermolecular forces in a resin thus permitting the macromolecules to slide over one another more freely.
1116509
analize an existing polymer with as many properties of the ones you are looking for, determine the formula ( possibly use a mass spectrometer for the recipe,)  experiment with the atomic structure of the elements in the formula. wouldn't it be great if you could manipulate the structure at subatomic level, i.e. at levels below protons and neutrons like quarks.\ntry changing the formula ( recipe?) at its basic level, with different proportions of at least carbon and hydrogen, possibly adding 'alloying' elements into the atomic structure.
1187223
Well, a clear question would help. \n\nAre you trying to calculate the power that a certain material can withstand?   Or are you trying to calculate strength?
253593
The type of plastic selected has a great influence on the performance of the plated plastic part. ABS plastics are the base materials in most cases.\n\nCheck out the following:
440239
It Depends on what gains more importance,\n1) If you what it to be rigid & give a good look then ABS will be good,\n2) If you want it to be soft than PP (Polyproplene) is good,\n3) If you what it to be heat resistant & high stength then Bakalite (Thermoset plastic) will be good
170252
Imagine that you have a rod say 10 feet long and one square inch in cross-section suspended from a tall ceiling with a loading hook on the bottom.\n\nIf you place say a 100 pound weight on the hook you load the entire length of rod.  At every cross-section of the rod (a horizontal cut) the "stress" will be 100 PSI (pounds per square inch).\n\nThe load is taken up by distorting the molecules within the rod.  If the rod is rubber it might stretch say one foot total.  This is the strain.  The strain would be 1 ft per 10 ft or 1/10 or 0.1 where the units cancel out.\n\nIf the rubber rod continues to stretch with time, there is a time componment which is called creep.  There is a feedback component to stress/load/strain in that more load increases stress and more strain or molecular distortion occurs to take up the added load.\n\nUsually the stress/strain/load properties are applied to metals such as a steel rod and depend on distortion (strain) of entire metal crystals within the rod.  The strain is almost impossible to see and special strain gages must be used.  Also steel can support very heavy loads and exhibit creep only near their load limits.  If the load limit is exceeded, permanent deformation will occur or even necking (reduction of diameter) and ultimately rupture.\n\nThe stress/strain characteristics of metals are determined on special tensile test machines and the data are used to design configurations far more complex than a rod.
835181
it's got two aspects to it- thw molecular make up (natural cellulose and synthetic polymers) but the easiest explaination is this-\n\n    when u tear paper, the bonds break and molecular collision takes place. all this creates energy which is dissapated as sound energy (tearing sound)\n     wheras when you try to tear plastic, you will find that instead of simply tearing up, plastic paper stretches. this is because it is made of synthetic polymeric reactions. so, the energy which is released is not released in the form of sound energy, but it is released as heat. you will note when you try ti tear plastis sheets that it will first stretch, become warm and then kind of 'pull away' from the bulk sheet.
118056
In a general sense, tensile strength is measured by comparing how much weight a piece of material can hold up.\nOpacity would be measured by shining a light of a known strenght through the paper, and then comparing the value to the strength of the light without the paper inbetween.\nAs to the specific equipment used... I don't know.
810187
I am not sure but I would guess that the polyester will hold up a little better than the paper through all of the movement of the windings. Adding to that, the mineral oil used for cooling the transformer may deteriorate the paper as well.\n\nAll of the above is speculation based on what I have observed
909019
You'll get the same strength(within reason) and the same dimensions using this method.I can't believe noone has answered this question yet.Good luck on the other site!
720952
Hardened concrete strength depends on the water to cement ratio (w/c ratio). Lower the w/c ratio, higher the concrete strength. This is because excessive water in concrete may create water pores and void in the concrete which will affect concrete strength.\n\nBut the problem is when we use lower w/c ratio, workability of the concrete will be very poor. Increasing the use of water in other hand may improve workability but increases w/c ratio. By adding superplasticizers into fresh concrete, it can improve workability and maintain optimum w/c ratio.\n\nAlthough plasticizers cannot directly improve the strength of hardened concrete, it promotes workability, thus enable concrete to have lower w/c ratio.\n\nMore technically, superplasticizers interact with wet cement particles and produces a membrane of absorbed charged molecules around each particles, with prevent the cement from flocculate or become sticky.
628448
learn more about different plastic materials
1006037
I am a packaging engineer and I can probably shed some light on why the packaging is the way it is.  In the case of molded plastic shells around products like portable CD players and curling irons, two main factors are usually the reason.  First is cost.  Thermoformed plastic "clamshells" are cheap.  As most people know, companies are always looking for ways to save a buck.  Second is theft prevention.  With those large clamshell packages it is hard to just walk out of a store with a stolen product, and since you can't get into it very easily, you can't take the product out of the package to walk out of the store.  Luckily, there are new features being built into many of those clamshell packages that make them easier to open.
875178
I think vulcanisation helps in doing that. We heat rubber with Sulphur to make it stronger.
925947
Before the introduction of plastics in the building industry, cast iron, pressed steel and zinc were in common use for gutters and rainwater pipes.  When plastics were developed, PVC became the preferred plastic due to its lightness, ease of installation and resistance to deterioration. In my experience the time taken to fit plastic materials is approximately half to one third that of traditional materials.  Plastics are also smooth on the surface reducing resistance and allowing  water to flow more freely.
540888
My understanding is that the shear stretches the molecules out, allowing more interactive sites to be exposed.  In a linear form, the molecule becomes more able to participate in bonding with its neighbor.
57120
Well, you'd have to specify what you are trying to dissolve.  Many plastics are soluble in several solvents... N-Methylpyrrolidone being a good one.  Solvents generally do not attack metals, unless they contain water.  I would steer away from an acid or a base.  Can you say what you're thinking of?  If so, email me at connecticutpoet37@yahoo.com