Dielectric property and electromagnetic interference shielding effectiveness of ethylene vinyl acetate‐based conductive composites: Effect of different type of carbon fillers (2011)
https://onlinelibrary.wiley.com/doi/abs/10.1002/pc.21133
Flexible and semiconductive EVA (Ethylene Vinyl-Acetate Copolymer) shielding material
https://patents.google.com/patent/CN104231406A/en
I need a shower curtain. After researching I found a transparent one made of PEVA. But there are 2 versions of it: one is 0.15 mm thick, the other 0.20 mm thick.
Vendor claims the thicker one is heavy enough so it won't stick to your body. What is your experience with thicker shower curtains made of PEVA?
AFAIK this is not a problem with polyester curtains, those never stick to my body... What is your experience with polyester curtains?
Controlled radical polymerization of ethylene was conducted through ITP. Copolymerization with vinyl acetate provides a range of well‐defined structures, including poly(ethylene‐co‐vinyl acetate) containing VAc from 0 to 85 mol %.
Abstract
Controlled radical polymerization of ethylene using different commercially available, cheap, and non‐toxic iodo alkyls is performed by iodine transfer polymerization (ITP) under mild conditions (≤100 °C and ≤200 bar). The formed well‐defined iodo end‐capped polyethylene (PE−I) species is very stable upon storage. Narrow molar‐mass distributions (dispersities around 1.6) were obtained up to number average molar masses of 7300 g mol−1. The ethylene copolymerization by ITP (ITcoP) with vinyl acetate allowed to form a broad range of poly(ethylene‐co‐vinyl acetate) (EVA) containing from 0 to 85 mol % of VAc unit. In addition, EVA‐b‐PE block copolymers or EVA‐b‐EVA gradient block copolymers with different content of VAc in the blocks were obtained for the first time using ITP. Finally, reactivity trends were explored by a theoretical mechanistic study. This highly versatile synthetic platform provides a straightforward access to a diverse range of well‐defined PE based polymer materials.
https://ift.tt/3fxj3NM
The market is segmented by Application (Polyvinyl Acetate, Polyvinyl Alcohol, Ethylene Vinyl Acetate, and Other Applications), by End-user Industry (Solar, Automotive, Building and Construction, Packaging, Textile, and Other End-user Industries), and Geography (Asia-Pacific, North America, Europe, South America and Middle East & Africa).
Market Overview
The market for vinyl acetate is anticipated to register a CAGR of more than 4% during the forecast period. The increasing use of vinyl acetate products in the solar power-generation industry is also likely to stimulate the market growth.
Increased use of adhesives in food packaging and growing use in solar power generation are augmenting the growth of the market.
Stringent health and environmental regulations and fluctuating prices of raw materials are likely to hinder the market’s growth.
Use of EVA for 3D Printed Medical Drug Delivery Devices is projected to act as an opportunity for the market in future.
Key Market Trends
Increasing Demand from the Solar End-user Industry
Ethylene vinyl acetate (EVA) is used for the encapsulation of photovoltaic (PV) modules in the majority of solar cells, due to the advantages, such as good light transmittance and elasticity, excellent melt fluidity, low processing temperature, and adhesive property.
The use of solar cells has constantly been increasing worldwide. With increasing government support, the new installation capacity of solar photovoltaic cells is increasing rapidly around the world from the past decade.
Solar power industry is one of the fastest growing industries in the world. According to International Energy Agency (IEA), this industry accounts for almost two-thirds of net power capacity worldwide. The value of solar power was estimated USD 86 billion in year 2015 and is projected to reach USD 422 billion by year 2022.
The United States is the second-largest PV market after China. According to Solar Energy Industries Association (SEIA), the solar industry generated USD 17 billion investment in the American economy.
India’s annual Solar PV additions have been doubled, with 9.6GW coming online, due to government’s policy to increase the share of solar power in the country’s energy mix and also due to falling down equipment prices globally.
Whereas, in Japan solar PV capacity growth slowed down by 12% to 7GW and in European Union, annual PV additions remain stable at below 6GW.
Therefore, the aforementioned factors are expected to increase
... keep reading on reddit ➡
The first example of a controlled radical polymerization of ethylene using iodine transfer polymerization (ITP) is performed under mild conditions (≤ 100 °C and ≤ 200 bar). Different commercially available, cheap, and non‐toxic iodo alkyls (R‐I) were used as chain‐transfer agents (CTAs) in combination with 2,2’‐azobis(2‐methylpropionitrile) (AIBN) to investigate the impact of the R‐group on the polymerization behaviour. These systems showed no rate retardation and no significant loss of chain ends. The formed well‐defined end‐capped polyethylene–iodine (PE–I) species is very stable upon storage. Molar‐mass distributions with dispersities around 1.6 were obtained up to number average molar masses M n of 7300 g mol ‐1 . The copolymerization by ITP (ITcoP) of ethylene with vinyl acetate (VAc) to form poly(ethylene‐ co ‐vinyl acetate) (EVA) copolymer was also successful. By fine tuning the ethylene pressure and the vinyl acetate content, a broad range of copolymers containing from 0 to 85 mol% of VAc unit was achieved. By reactivating the iodo chain‐end, block copolymer structures composed of ethylene and VAc such as poly(ethylene‐ co ‐vinyl acetate)‐ b ‐polyethylene (EVA‐ b ‐PE) or gradient block copopolymers EVA‐ b ‐EVA with different content of VAc in the blocks were obtained for the first time using ITP. This highly versatile synthetic platform provides a straightforward access to a diverse range of well‐defined PE based polymer materials. Finally, reactivity trends were explored by a theoretical mechanistic study.
https://ift.tt/3fxj3NM
