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Penulis Topik: Vitamin C dan plastik  (Dibaca 4223 kali)

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Vitamin C dan plastik
« pada: Maret 04, 2007, 05:03:35 PM »

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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Oktober 08, 2016, 01:58:10 PM
adakah disini yang sedang atau pernah menggunakan aplikasi Lisrel?


September 26, 2016, 04:23:51 PM
ada yang bisa kasih lay out robot line follower analog gak? yang langsung bisa di print


September 26, 2016, 02:04:43 PM
koneksi gwa bermasalah disaat gwa mau submit post ke 666... hihihi kebetulan kah?


September 26, 2016, 01:22:58 PM
1 dulu ya? :) trit copas juga.

soalnya sy juga sibuk.


September 22, 2016, 05:25:04 PM

bantuin bikin thread. lagi sibuk jadi cuma sempat bikin copas dulu.


September 22, 2016, 09:24:18 AM
Thanks, om reborn :)
kirain ga bakal direnewal forumnya.
dah disebarin beritanya  >:(


September 21, 2016, 08:49:30 PM
oh BTW thanks ya om reborn :)
Wish You Luck!


September 21, 2016, 08:42:55 PM
Hahaha ternyata udah di renewal sama om reborn pas jam 11 tadi! ;D

diem-diem direnewal forumnya.



September 21, 2016, 10:30:32 AM
ForSa masih ada tapi expiration date tetap tanggal 21? Kita tunggu saja sampai pukul 18:23:19
sebab menurut data registrasi berakhir pada pukul 18:23


September 21, 2016, 10:30:09 AM
setiap member yang pake siggy juga ngalamin. saya juga.

Monox D. I-Fly

September 20, 2016, 10:39:22 PM
Kok di beberapa post siggy saya nggak muncul ya? Padahal masih thread yang sama...

Monox D. I-Fly

September 19, 2016, 05:26:35 PM
ini soal "memento" personal saya, bukan soal backup forum... btw kl bisa post di thread Mathematicards dong, biar saya gk double post di postingan ke-2000  ;D


September 19, 2016, 04:00:11 PM
kalo cara itu masih membutuhkan link ke ForSa dan anda mesti online utk mengaksesnya berarti sama saja dengan bookmark kan? dan bookmark tdk bisa menyelamatkan data dr website yg expired.

Monox D. I-Fly

September 17, 2016, 09:08:31 PM
Saya cukup ngepost di FB yang kayak begini:


September 17, 2016, 05:57:58 PM
mau online gak tanggal 20 malem hari?
kta chit chat habis-habisan? :)