What Polypropylene Plastics Are and How Theyre Used

The world of plastic is not a cut and dried one. There are around 45 different types of plastic and each one has its own properties and uses, from commercial to residential. Polypropylene is one type of plastic that is used for a number of different products, due to its wide variety of properties. Understanding the chemical properties, history and advantages of this plastic can allow you to see the importance that this type of plastic has on your everyday life. What are the chemical properties of this plastic? Chemical Properties of Polypropylene Polypropylene is located between low-density polyethylene (LDPE) and high-density polyethylene (HDPE) on the crystallinity level. It is flexible and tough, especially when it is copolymerized with ethylene. This copolymerization allows this plastic to be used as engineering plastic that is in a number of different products and uses. The flow rate is a measure of molecular weight and this determines how easily it will flow during processing. A higher MFR allows the polypropylene to fill the mold more easily. As the melt flow increases, some of the physical properties of the plastic decreases, however, such as impact strength. History of Polypropylene German chemist, Karl Rehn, and Giulio Natta first polymerized propylene to a crystalline isotatic polymer in March 1954. This discovery soon led to a commercial production of polypropylene starting in 1957. Others claimed the discovery, as often occurs when a general body of knowledge is used, and this litigation was not resolved until 1989. This very popular plastic is one that many different manufacturers use for a number of different products. What Is Polypropylene Used For? Polypropylene is used for a wide number of different products. Due to the resistance to fatigue, this means that it can be used on items that are going to have high stress, such as hinge mechanisms on water bottles and more. It is also used in manufacturing piping systems, as well as chairs, and in medical or laboratory use. The colorfastness means that it is also used in carpeting, rugs, and mats. Ropes, cable insulation, roofing membranes, storage boxes, disposable bottles, plastic pails and other items are also made using this type of plastic. When you consider the impact of this plastic on your everyday use, you will see that it is one plastic that most people just cannot live without. PP plastics are also used in fiber reinforced composites. Common trade names for FRP glass fiber reinforced polyproplyene include Polystrand and Twintex. Polypropylene Advantages Polypropylene offers many different advantages. These advantages allow it to be used for a wide variety of different products and uses, from high heat to cold weather and more. What are some of these advantages? -Low cost makes it budget friendly for a wide number of uses -Has a moderate strength and stability -Has flexibility, which makes it easy to mold into different shapes -Colorfast, which means that any colors will stay bright and beautiful -Resistant to fatigue, which allows it to be used for things such as water bottle hinges and spouts -Offers good insulation for pipes, cables, and more -Chemically resistant to most oils and solvents -Excellent impact strength -Low coefficient of friction -Excellence moisture resistance -High temperature resistance, which means it can be used in laboratories When you look at polypropylene, you can see that it has many different properties that explain its widespread use. From clothing to pipes to carpet and more, this type of plastic is one that is used in a number of different products. Understanding its importance will allow you to appreciate it to the fullest. Polypropylene is one plastic that can be used for products now and can be recycled into products for the future as well.

Human Corruption Of Human Nature - 1140 Words

Human Corruption in â€Å"The Lottery† â€Å"The Lottery† by Shirley Jackson is a classic short story in U.S literature. Written in 1948, the short story has been published in multiple languages around the world. It is still a required reading in U.S today. The story was later adapted into both a TV short and a play (â€Å"Shirley Jackson’s Bio†). Jackson uses irony and symbolism in â€Å"The Lottery† to show the corruption of human nature. The story opens up on a clear June day. It continues to describe an ominous scene where the village people are gathering and the children are collecting stones. Every year, the village has a ritual called the lottery. There is a black box containing slips of paper, and only one has a black spot. To begin, each household†¦show more content†¦The second instance is when Mrs. Hutchinson shows up late to the lottery drawing, claiming that she forgot what day it was, and the end is one who wins the whole drawing. An elderly man in the town even brags that he has been in the lottery for seventy seven years. When the Hutchinson’s son Davy goes up to draw, he giggles (Jackson). All these examples show how desensitized the people are to killing one of their own. On top of that, the people do not even understand why the tradition of the lottery is in place, but they still follow through on it. Some of the townspeople discuss how other towns have quit the tradition of the lotter y. During the event itself, people want to hurry through so that they can continue with their day. To them, it is normal and expected that they all will kill someone and move forward. It does not phase them at all. This all not only shows the desensitized component, but also how humans are creatures of habit, and once we form a habit, we follow through on it even if we do not understand why. After a habit is repeated for a while, the meaning behind it becomes lost in the ritual and is normalized. Symbolism is another tool that Jackson uses to show how mans’ nature is distorted. The color black is used multiple times throughout the story to represent the emanate death that is to come to one individual in the town. The box that the village draws the paper from is black along with theShow MoreRelatedThe Human Nature Of Corruption Has Struck Again823 Words   |  4 PagesBlood. War. Protest. The human nature of corruption has struck again. A small country located just off the southern coast of Asia has been hit drastically by corruption. Through riot or protest, the people have begun to stand up for themselves, congregating into huge groups within the streets of the capital, or leaking information to the public press and onto social media. â€Å"Malaysia is truly going downward. Najib [the Prime Minister of Malaysia] will either step down peacefully or there will be riversRead MoreRobert Frost s Poem Nothing Gold Can Stay959 Words   |  4 PagesIn the poem â€Å"Nothi ng Gold Can Stay† from Robert Frost, corruption first began in nature. The corruption in nature is first seen in the poem when â€Å"†¦ leaf subsides to leaf† and â€Å"†¦dawn goes down to day† (Frost 5, 8). Frost says that nature was once so beautiful but by the conflict in the Garden of Eden it was corrupted. The conflict in the Garden of Eden was caused by corruption in humans. It seems that humans ruin everything good for the sake of themselves. Frost probably wrote this poem while sittingRead MoreThe Dark Knight, By Christopher Nolan1398 Words   |  6 PagesThe human nature is a very strange aspect of the human race but it is also an important aspect in everyday life; it makes people who they truly are. 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Throughout Hamlet, a play, set in Denmark, which was written in the early seventeenth century by William Shakespeare, there are several instances where one sees decay depicting corruption. Though this play is filled with massive images of decaying nature, it is also filled with images of nature in its beautiful state. BecauseRead MorePrayer Before Birth78 3 Words   |  4 Pagesits own corruption (4th stanza). Tone The tone of this poem can be interpreted in a number of different ways.   The child seems  fearful  of the future and as such  urgent  and  impassioned  in its dialect.   The poem also seems to have an  apocalyptic  or  nightmarish  feel to it.   The continuous negativity could also illustrate the  hopelessness  of the situation. Themes  ·Ã‚  The world is cruel and dangerous  ·Ã‚  The world is manipulative  ·Ã‚  A plea for human freedom  · Nothing is safe from corruption Form andRead MoreThe Early Days of the Christian Church: Sin and Salvation1284 Words   |  5 Pagesthe nature of God and Christ. While the church worked to establish doctrine on the nature of God and, Christ a controversy arose concerning human nature. The controversy started in the 5th century when Pelagius a British spiritual director heard a bishop quote from Augustine’s Confessions. The quote stated, â€Å"Grant what you command and command what you will†. Pelagius believed the quote allowed humans to avoid taking responsibility for choosing to sin. Pelagius’ views on the nature of sinRead MoreReality of Human Nature Hidden Behind the Canterbury Tales Essay1460 Words   |  6 PagesReality of Human Nature Hidden Behind the Canterbury Tales A common word on the street says that everyone is different, therefore behave differently. Everyone has their own lifestyles and have diverse habits or reactions among circumstances. It is true. People do have different appearances, styles, ethnicities, and interests because of how they were raised within a family or just the way they are born. However, physical appearances may have an effect on how people are unlike, but emotionally andRead MoreEssay on Humanity956 Words   |  4 Pagesessay discussing human love, corruption, evil and hatred, and its relation to human nature. This is my philosophy; it is the product of what I have learned from other people and through observation of the world around me.The key ideas I will be supporting in the following paragraphs is that it is human nature to want to give and receive love; and a nature that must be exploited the fullest in order to rectify the current state of the world. Evil, competition, hatred and the human capabilities of suc h

Alternative Learning System free essay sample

In essence,  three basic assumptions  are held to be true. [original research? ]  First, learning is manifested by a change in behavior. Second, the environment shapes behavior. And third, the principles of contiguity (how close in time two events must be for a bond to be formed) and reinforcement (any means of increasing the likelihood that an event will be repeated) are central to explaining the learning process. For behaviorism, learning is the acquisition of new behavior through conditioning. There are two types of possible conditioning: )  Classical conditioning, where the behavior becomes a reflex response to stimulus as in the case of  Pavlovs Dogs. Pavlov was interested in studying reflexes, when he saw that the dogs drooled without the proper stimulus. Although no food was in sight, their saliva still dribbled. It turned out that the dogs were reacting to lab coats. Every time the dogs were served food, the person who served the food was wearing a lab coat. We will write a custom essay sample on Alternative Learning System or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Therefore, the dogs reacted as if food was on its way whenever they saw a lab coat. In a series of experiments, Pavlov then tried to figure out how these phenomena were linked. For example, he struck a bell when the dogs were fed. If the bell was sounded in close association with their meal, the dogs learned to associate the sound of the bell with food. After a while, at the mere sound of the bell, they responded by drooling. 2)  Operant conditioning  where there is reinforcement of the behavior by a reward or a punishment. The theory of operant conditioning was developed by  B. F. Skinner  and is known as  Radical Behaviorism. The word ‘operant’ refers to the way in which behavior ‘operates on the environment’. Briefly, a behavior may result either in reinforcement, which increases the likelihood of the behavior recurring, or punishment, which decreases the likelihood of the behavior recurring. It is important to note that, a punishment is not considered to be applicable if it does not result in the reduction of the behavior, and so the terms punishment and reinforcement are determined as a result of the actions. The earliest challenge to the behaviorists came in a publication in 1929 by Bode, a  gestalt  psychologist[3]  . He criticized behaviorists for being too dependent on overt behavior to explain learning. Gestalt psychologists proposed looking at the patterns rather than isolated events. Gestalt views of learning have been incorporated into what have come to be labeled  cognitive theories. Two key assumptions underlie this cognitive approach: (1) that the memory system is an active organized processor of information and (2) that prior knowledge plays an important role in learning. Cognitive theories look beyond behavior to explain brain-based learning. Cognitivists consider how human memory works to promote learning. For example, the physiological processes of sorting and encoding information and events into  short term memory  and  long term memory  are important to educators working under the cognitive theory[4]  . The major difference between gestaltists and behaviorists is the locus of control over the learning activity: the individual learner is more key to gestaltists than the environment that behaviorists emphasize. Once memory theories like the  Atkinson-Shiffrin memory model[5]  and Baddeleys  working memory  model[6]  were established as a theoretical framework in  cognitive psychology, new cognitive frameworks of learning began to emerge during the 1970s, 80s, and 90s. Today, researchers are concentrating on topics like  cognitive load  and  information processing  theory. These theories of learning play a role in influencing  instructional design. [7]  Aspects of cognitivism can be found in learning how to learn, social role acquisition, intelligence, learning, and memory as related to age. Educators employing a cognitivist approach to learning would view learning as internal mental process (including insight, information processing, memory, perception) where in order to develop learner capacity and skills to improve learning, the educator structures content of learning activities to focus on building intelligence and cognitive and meta-cognitive development Constructivism Main article:  Constructivism (learning theory) The learning theories of Jean Piaget, Jerome Bruner, Lev Vygotsky and John Dewey serve as the foundation of constructivist learning theory. 8]  Constructivism views learning as a process in which the learner actively constructs or builds new ideas or concepts based upon current and past knowledge or experience. In other words, learning involves constructing ones own knowledge from ones own experiences. Constructivist learning, therefore, is a very personal endeavor, whereby internalized concepts, rules, and general principles may consequently be app lied in a practical real-world context. This is also known as  social constructivism  (see  social constructivism). Social constructivists posit that knowledge is constructed when individuals engage socially in talk and activity about shared problems or tasks. Learning is seen as the process by which individuals are introduced to a culture by more skilled members. [9]  Constructivism itself has many variations, such as  Active learning,  discovery learning, and  knowledge building. Regardless of the variety, constructivism promotes a students free exploration within a given framework or structure. 10]  The teacher acts as a facilitator who encourages students to discover principles for themselves and to construct knowledge by working to solve realistic problems. Aspects of constructivism can be found in self-directed learning, transformational learning, experiential learning, situated cognition, and reflective practice and religious practice