尼龙的介绍（Nylon introduction）
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What's the density of nylon? It's urgent!! Thank you)
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Views: 46295 reward points: 10 | question time: 2007-3-20 16:45 | questionger: Demon language | why is clod
Curriculum design should be ud!! 1 get rid of!! Problem supplement:
What is the exact value?
幸运草There are 3 other answers
The density of nylon is expresd by T, and the universal system of textile materials reprenting linear density (Tex System) is adopted. A qualified down jacket should be 230T-250T, and the average umbrella is 150T.
nylon
Polyamide commonly known as Niron (Nylon), the English name Polyamide (referred to as PA), is the main chain containing repeated amide groups - [NHCO] - thermoplastic resin collectively. Including aliphatic PA, aliphatic aromatic PA and aromatic PA. Among them, aliphatic PA has many varieties and large yield, and is widely ud. Its nomenclature is determined by the specific carbon number of the synthetic monomer.
The main varieties of nylon of nylon 6 and nylon 66, absolute dominant position, followed by nylon 11, nylon 12, nylon 610, nylon 612 and nylon 1010, nylon 46, nylon 7, nylon 9, nylon 13, new varieties of nylon 6I, nylon 9T and nylon MXD6 (special barrier resins), nylon modified variety quantity, such as reinforced nylon, monomer casting nylon (MC nylon), reaction injection molding (RIM) aromatic nylon, nylon, nylon, high impact (Supertough nylon), electroplating conductive nylon,
抓鸡>羡煞旁人是什么意思nylon, flame retardant nylon, nylon and other polymer blends and alloy, meet various special requirements, widely ud in metal, wood and other traditional materials as substitutes for various structural materials.
Nylon is the most important engineering plastic, and its output is the first in the five major engineering plastics十大赚钱方法
Performance:
Nylon is ductile, angular, translucent or milky crystalline
resin. As a engineering plastic, nylon molecular weight is generally 1.5-3 million. Nylon has high mechanical strength, high softening point, heat resistance, low friction coefficient, wear resistance, lf lubrication, shock absorption and silencing, oil resistant, acid resistant, alkali resistant and common solvents, good insulation, lf extinguishing, non-toxic, odorless, good weatherability, dyeing poor. The disadvantage is that water absorption is large, affecting dimensional stability and electrical properties, fiber reinforcement can reduce resin water absorption, so that it can work under high temperature and high humidity. Nylon and glass fiber have very good affinity. Commonly ud in the production of comb, toothbrush, hook, fan, bag rope, fruit bags etc.. Non toxic, but not long-term
contact with acid and alkali.
History of nylon
People are no strangers to nylon. In daily life, nylon products are everywhere, but few people know about it. Nylon is one of the first synthetic fibers developed in the world.
In the early twentieth Century, it was considered an unthinkable thing to engage in basic scientific rearch in the business world. In 1926, the DuPont Co, the largest industrial company in the United States, was interested in basic science and suggested that the company carry out basic rearch on the discovery of new scientific facts. In 1927 the company decided to pay $250 thousand a year as the rearch cost, and began to employ chemical rearchers to study chemical bad DuPont Co established in 1928, the 32 year old Carlo Seth (Wallace H. Carothers, 1896 ~ 1937), hired as head of the Department of
organic chemistry.
Carlo Seth, American organic chemist. Born in Wilmington, Iowa, in April 27, 1896. In April 29, 1937, he died in Philadelphia, USA. After receiving his Ph. D. from University of Illinois in 1924, he worked
as an organic chemistry professor in the University and Harvard University. In 1928, he applied for organic chemistry rearch at the DuPont Co laboratory in Wilmington, USA. He presided over a ries of studies on the u of polymeric methods to obtain high molecular weight substances. In 1935 prepared polymers with adipic acid and hexanediamine, due to containing 6 atoms of carbon in the two fractions, then known as the 66 polymer. He then melts the polymer and pass it through the needle, which is called a fiber in tension. This fiber, that is, polyamide 66 fiber, was industrialized in 1939. It is called Nylon. It is the earliest synthetic fiber variety to realize industrialization.
The synthesis of nylon lays the foundation for the synthetic fiber industry,
下雪天>自信议论文
The appearance of nylon gives a new look to the fabric. Fabric made of this fiber nylon stockings is transparent and durable than silk stockings, 10 1939 24, DuPont public eye caud a nsation in the headquarters of public sale of nylon stockings, regarded as precious to panic buying, people have ud "as thin as silk, as steel, like silk silk beauty" the words of prai to the fiber, nylon fabric to May 1940 sales throughout the United states.
From the outbreak of the Second World War until 1945, the nylon
industry was diverted to parachute, aircraft, tires, cord fabrics, military uniforms and other military pro
ducts. Becau of the characteristics of nylon and a wide range of us, after the cond world war is developing very rapidly, a variety of products from nylon stockings, dress to the carpet, fishing nets, in countless ways, is one of the three synthetic fiber.
(picture) with a balloon made of nylon can do much to answer: Twelve | sauerkraut powder | 2007-3-20 16:46
Answer: 1.1 * 10^3kg/ cubic meters is about three | | 2007-3-20 19:17
The density of nylon is 1.023kg/L (70 DEG C)
Supplementary knowledge: the melting range of 68-69 DEG C, the boiling point of 262.5 DEG C, the refractive index of 1.4965 (nD31 C). Answer: love you lucky | ven | 2007-3-20 19:20
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