Polyester is a category of polymers which contain the ester functional group in their main chain.
However! the term "polyester" as a specific material most commonly refers to polyethylene terephthalate (PET), which can be made in two ways, and both are done in chambers that feature strong vacuums and high temperatures. # The first requires dimethyl terephthalate and ethylene glycol. You make it this way, and the process will liberate methanol--which you have to capture, store and figure out something to do with. (In most cases, the "something to do with it" is to mix it with terephthalic acid and feed it back into the process.) # The other is to use terephthalic acid and ethylene glycol. This requires more heat, but it produces no methanol--a very important thing when you consider how dangerous methanol is. No one wants it around if they're not using it.
Some polyesters also include naturally-occurring chemicals, such as in the cutin of plant cuticles, as well as synthetics such as polycarbonate and polybutyrate.
put a drop of bleach in, then two scoups of washing powder in. And it should come out exactly the same. m
Basic departments in textile are Productional, Purchase, Marketing & Finance
The rise in the price of oil can be traced to a a simple factor, but there are several other contributing factors.
The simplest explanation is that the demand for oil is greater than the current production. When demand exceeds supply, price will increase as people are willing to pay more to ensure that they get their scarce resource (oil in this case).
Depending on your political views and knowledge of the situation, you may also believe that the production of oil is much lower than capacity because certain middle-eastern countries know that America depends on oil imports more than other countries. An increase in oil prices will lead to a slightly weaker US economy.
If you want to know why gas is more expensive, see the simple reason above but also factor in the greed of the oil companies. Unfortunately, Americans have put themselves in a position where they consume very large quantities of gas, and they have no other legitimate fuel alternative. What this means to gas companies is that they can increase the prices substancially, and because Americans "need" so much gas, they will be forced to buy it at the higher price (or go without driving).
The other reason is that OPEC is a large cartel arrangement that has the sole purpose of profit maximisation as a whole. Thus they set the industry MR and MC to maximise profits for the industry as a whole as opposed to competing amongst each other - this allows OPEC to effectively limit the output so that it corresponds to the profit maximising level and drive up the price.
The terms are pretty much synonymous. They both refer to a religious deviate. Heresy was coined by the early Roman Catholic church to refer to those deviated from the Catholic Church. The term Apostasy is used by the Bible to denote one who strays from the pattern of truth found in the Bible. Often the term "apostasy" will refer to one who has declared a belief or affirmed an attachment to a set of beliefs, but later attempts to lead other adherents to stray from those beliefs; "heresy" is often used to refer to a similar situation led by a non-adherent.
Some clothes are made from 100 percent polyester.
Pepsin is a powerful protein digesting enzyme which is far too dangerous in its active form so it is released in an inactive pepsinogen form by the cell and activated only in the digestive tract where it is required to be active.
YES, IT IS UNCOMFTORBLE. it causes heat and static energy when using it. it feels like A TABLECLOTH!. it is only alright if it is blended with cotton or if not coloured. if your talking about shirts then it wont be much if a problem but with duvet covers then yes. you would have to use a fabric softener to soften the rough polyester. but the benefit is it wont really get dirty. dirt on polyestre can be cleaned of much easier than cotton.
please answer this question as i really need to know by tomorrow.. :)
This guy is supremely dumb, he commented a question on a answer. He must be a dumb American.
Polyester refers to a broad group of chemical compounds which share a common element in their chemical composition. Polyester as a fabric used in clothing is flamable, but not in the same way as cotton or paper. Polyester first melts, causing burning and potentially fusing with the victim's skin. If the melted fibers continue to be heated, they will burn like candle wax, only hotter.
polyester is a monomer formed of two monomers namely 1,4-butane diol & adipic acid
Fibre or Fiber is a type material with continuous filaments and ever heard of PET, Polyester is a category of polymer, which are chemical compound, polyesters are produced in numerous forms such as fibers and sheets. Some clothing are made of polyester fibre (natural or chemical)
polyester was first made in China. I found this out in my boyscout textile manual while working on it.
Polyester is used to manufacture clothing and home furnishings such as furniture, bedspreads, sheets, pillows, carpets and curtains.
Polyester is also used to make plastic beverage bottles (PET).
Mylar, used to make Mylar balloons, is a kind of polyester film. The balloons are a composite of Mylar and aluminum.
Polyester is also used to manufacture thread, hoses, high strength ropes and much more.
A mica capacitor is simply one that uses the mineral mica as the dielectric or insulator between plates.
Polyesters contain C, H, O.
when high voltages are present because the voltage rating of polyester (polyethylene terephthalate) capacitor is high as well as electrolytic capacitor will destroy if the voltage increases from nominal voltage and cause short circuit conditions.
Depends on intended usage and preferences. polyester dries faster but is less resistant to heat.
Not always, although the term is widely used for plastics such as polystyrene and polyethylene, and for artificial fibers such as Dacron, which like plastic bottles is a form of polyethylene terephthalate (PET). There are some natural polyesters.
A "polyester" is any natural or synthetic polymer (repeated chain molecule) containing esters. But the term is usually applied to two groups of synthesized molecules: thermoplastics and thermosets.
polyester is a man made material,it is soft to touch and feels silky now a days unlike years ago when it was rough,also it is used for sleeping bags and some quilts etc
Polyester is very silky and shiny!
no it is not natural
they use a mashine and blend them together