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POLYMERS 1.Fundamentals of Polymer Technology 2.Thermoplastic Polymers 3.Thermosetting Polymers 4.Processing of Plastics Polymer A compound consisting of long-chain molecules, each molecule made up of repeating units connected together •There may be thousands, even millions of units in a single polymer molecule •The word polymer is derived from the Greek words poly, meaning many, and meros                            (reduced to mer), meaning part •Most polymers are based on carbon and are therefore considered organic chemicals Types of Polymers •As engineering materials, it is appropriate to divide them into the following two categories: 1.Thermoplastic polymers 2.Thermosetting polymers Thermoplastic Polymers - Thermoplastics Solid materials at room temperature but viscous liquids when heated to temperatures of only a few hundred degrees •This characteristic allows them to be easily and economically shaped into products •They can be subjected to heating and coolin

sabka maalik fake hai: according to me every religion was formed by an  atheist. when people had no concept of religion and god they usually led a nomadic life. but with gradual evolution with the their brain and society they started to living a non nomadic life . in society like those of harappa and  mesopotamia. disasters like earth quake, flood , volcano etc introduced the concept of fear , it introduced the concept of a power that is beyond their control. and these events gradually developed the fearful respect for an unseen power - the fake power; which in turn coined the term of god. since people started to live in a society they started feeling the strength of easy life, which grew desire for more luxury. since they where now living in society different people in the society were doing different jobs , some were farmers some were traders and some were managers of society because without these people we can not imagine people living in the society because these are t

news of the day: Last week, global financial markets were churning, but it really only mattered if you were an oil trader, Chinese bureaucrat or hedge fund manager. Now it's starting to get scary for everyone. An 8.5 percent drop in the Shanghai Composite index in Monday's trading session spread to financial markets across the world. In the United States, the broad Standard & Poor's 500 index was down 2.5 percent in Monday morning trading, after steeper declines in Asian and European stock markets, falling prices for oil and other commodities, and a rush of money into the safety of U.S. Treasury bonds. What's fascinating is that there is no clear, simple story about what is different about the outlook for U.S. and European corporate profits; interest rates; or economic growth compared with one week ago, when the S&P 500 was 8 percent higher. Here's how to make sense of what is a truly global story, stretching from the streets of Shanghai, where stoc

China may be 7,500 miles from the heartland of the United States, but don't think for one minute the massive economic meltdown shaping up there won't also scald you in the process. You may have gotten a little burn on Friday, in fact. That's when the United States stock market tumbled to its biggest drop in almost four years – the S&P index dropping 3.2 percent, the Dow Jones Industrial Average shedding 3.12 percent Friday, one day after the indices fell more than 2 percent. Pundits will try to blame suspicion that the U.S. Federal Reserve will raise interest rates in September on nervous investors, but the markets should have long ago factored that worst kept secret in. They know a slight increase in fed rates is coming sometime in 2015 or early 2016. They also know the U.S. economy is slowly but surely warming up, with jobs, housing and production still steadying, a positive sign that means U.S. stocks should have a firmer foundation to stand on. You can t

the vyapam is an admission and recruitment scam involving politicians. senior officials and businessmen in the indian state of Madhya pradesh professional examination board that is MPPEB....in hindi it is popularly known as VYAPAM: givrn below are curtain mysterious deaths from vyapam ...taken from wikkipedia 21 November 2009 Vikas Singh Thakur Middleman in PMT scam Died in Barwani because of illness and adverse drug reaction 2 12 June 2010 Shyamvir Yadav Middleman in PMT scam from Gwalior Died in Raisen in a road mishap 3 14 June 2010 Anshul Sachan 24-year old MBBS student, who joined the Sagar Medical College in 2009. Allegedly a middleman in the PMT scam. He and two of his friends died in a road mishap, while returning from Bhopal to Sagar. Their car crashed into a truck near Raisen. According to Anshul's father, the three were drunk and were probably over-speeding. His grandfather does not suspect any foul play in the death either. The truck driver was arrested and late

what causes water to evaporate every fluid (pure) has a definite vapor pressure at a fixed temperature , now if any how the partial pressure of the fluid is less then the the vapor pressure of the fluid then the fluid starts evaporating to attain the partial pressure equal to the  vapor pressure of the fluid, and then the equillibrium is reached and evaporation stops.                              basically at the top of the fluid there is a random motion of the fluid molecule due to the difference between the addhesve and cohesive forces, some molecule say 'n' goes into the vapour phase and some strikes back say m such that n>m then after the above explained condition is achieved then the constraint m=n. conclusion whenever there is the fluid in liquid state is  present then in that system partial pressure is exactly to the vapor pressure. and whenever there is no fluid in liquid state is present then partial pressure is always less then the vapor pressure. g

every time you wonder how somebody solve arithematics so quickly, many people say its due to vedic mathematics but according to me......with the help of simple mathematics tricks you can make your own tricks......                               multiplying numbers around 50 any number around 50 can be represented as   (50+x), suppose i want to write 47 then x=-3; and suppose i need to write 52 then x=2 so 50+2=52. AIM: we need to find shortcut to multiply any number around 50. suppose we have two numbers around 50, they are (50+x) and (50+y), and their multiplication is M=(50+x)*(50+y). expending M we get, M=[2500+50y+50x+xy] or M=[100(25)+10{5(x+y)}+xy] , now from concept of number system we know that any 4 digit number example 6783 can be written as 67*100+8*10+3=6783, so we observe that 100 says that whatever coefficient it is associated with  is located at 100th place, simmilarly 10 says its is located at tenth place.  conclusion : M=100*25+[10{5(x+y)}]+xy...........

question; you have two flask one having 3 litre capacity  and the other having 4 litre capacity and you need to show a way to get 2 litre water out of these two such a questions can be solved within 20 second by modeling the situation mathematically:  let us consider we have two input 3 and 4 and with arithmatic you need to get 2 (in arithmatic we  are allwed to perform only additon and substraction because it is easy to visualise  these in real life...) now 4-3=1 ,now we have have generated one but we cant do 1+1=2 because we have generated only one 1 . so....3-1=2 is valid so we got the required answer 2.                                                                                               convert it into physical situation, subtraction means you are pouring one fill into other unfill and addition means you are pouring filled into other filled. so 4-3 suggest either you pour 4 litre into three or three litre into 4 litre ,since 4 litre cant be poured into 3 so we have