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Raidahafi27

Kemarin jam 07:12:04 AM
departemen tehnik lingkungan banyak menggambar nya ga??

jayanusantaraku

Pebruari 24, 2015, 08:46:50 PM
 >:(

jayanusantaraku

Pebruari 24, 2015, 08:42:11 PM
ada yg tau gk bahan kimia /material pembuat n pembentuk plastik n bagaimana proses campurane/takaran yg pas untuk membuat plastik frame kacamata yg celluloid n thanks ya

jayanusantaraku

Pebruari 24, 2015, 08:40:36 PM
hy saya anggota baru dr kota surabaya n salam kenal n thanks udh d ijinin gabung

abdillahibnunasrullah

Pebruari 24, 2015, 07:53:17 PM
Assalamualaikum, shalom kenal semuanya, ane temennya MuhammadRyan
 

MuhammadRyan

Pebruari 23, 2015, 10:23:33 PM
YAOW, Akhirnya pulang juga dari Haifah, Israel. Ada proyek... bkan soal Mossad...

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Pebruari 23, 2015, 03:34:34 PM
salam kenal semuanya, saya anggota baru di sini, mau tanya apakah ada yg tau bagaimana caranya agar daun yang sudah kita petik tetap segar dan tidak menjadi keriput/ menciut ?
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anjas

Pebruari 23, 2015, 06:39:48 AM
mas sekalian ada yang tahu  peringkat peringkat di forum sains

anjas

Pebruari 23, 2015, 06:32:32 AM
mas sekalian ada yang tahu  peringkat peringkat di forum sains

anjas

Pebruari 23, 2015, 06:32:03 AM
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Penulis Topik: Vitamin C dan plastik  (Dibaca 3099 kali)

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Vitamin C dan plastik
« pada: Maret 04, 2007, 05:03:35 PM »
http://www.nsf.gov/news/news_summ.jsp?cntn_id=108123&org=NSF&from=news

Vitamin C and Water : Healthy for Plastics

Two new laboratory breakthroughs are poised to dramatically improve how plastics are made by assembling molecular chains more quickly and with less waste. Using such environmentally friendly substances as vitamin C or pure water, the two approaches present attractive alternatives to the common plastic manufacturing technique called free radical polymerization (FRP).

"The methods both present novel and complementary ways to dramatically improve efficiency, product control, and cost for the polymer industry," said Andy Lovinger, the National Science Foundation program director who oversees funds for the two projects. "Each of these approaches could have a very significant impact on polymer manufacturing."

Plastics are polymers, long, potentially complex, molecule chains crafted from an array of smaller chemical units.  Using FRP, chemical engineers can create the right plastic for a range of applications, such as a specific trim for a car door or soft foam for a pillow.

For some plastics, the building-block molecules do not easily link together.  To surmount this problem, researchers from Carnegie Mellon University in Pittsburgh, Pa., devised a process called atom transfer radical polymerization (ATRP), which provides creative ways to coax the chemical subunits into chains.  However, this method comes with certain costs, such as the need for a copper catalyst that can become unwanted waste.

Now, the Carnegie Mellon researchers have discovered that adding vitamin C, glucose, or other electron-absorbing agents to the ATRP process can reduce the amount of copper catalyst by a factor of 1000. Because the catalyst often needs to be removed from the end products, less copper means far less waste and drastically reduced removal costs. Mass manufacturing could become more affordable for a range of items such as advanced sensors, drug delivery systems, paint coatings, and video displays.

At the University of Pennsylvania (UPenn), researchers are using a different approach to improve FRP. Called single electron transfer-living radical polymerization, the new method relies upon relatively low-energy reactions, uses elemental copper (copper metal, as opposed to copper in a chemical solution) as a catalyst to limit byproducts and allows manufacturers to use one of the most environmentally friendly solvents in the arsenal, water.  The entirely new method of polymerization builds upon existing mechanisms to craft large molecules very quickly.



 

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