Forum Sains Indonesia


Artikel Sains

Aku Cinta ForSa

ForSa on FB  ForSa on Twitter

Pranala Luar


Last 10 Shouts:


Oktober 22, 2014, 11:23:42 PM
tolong buatin program bahasa c++ nya gan, yang bisa tak ksih pulsa




Oktober 21, 2014, 12:31:18 PM
coba periksa ke ahli syaraf kang farabi.


Oktober 21, 2014, 11:29:44 AM
Tiap menjelang musim hujan sakit gigi, padahal giginya udah ga ada. Apa ini memang menimpa semua orang? Dan kenapa?


Oktober 20, 2014, 05:16:25 AM
hujan turun untuk pertamakalinya dalam beberapa bulan ini, disambut bahagia oleh lusinan burung gereja yang berterbangan di halaman rumah. sungguh indah pagi ini.


Oktober 14, 2014, 08:24:03 PM
malam, mw tx proses fisika apa yang menyebabkan sehingga bumi memiliki sifat magnet.??

mohon bntuanx sgera


Oktober 13, 2014, 08:08:28 PM
boleh deh...


Oktober 13, 2014, 06:59:24 PM
ada yang on ga ? bisa bantuin soal matematika kelas 9? besok mau mid


Oktober 13, 2014, 06:58:49 PM


Monox D. I-Fly

Oktober 09, 2014, 09:34:41 PM
musim pemilu juga sudah habis, liat aja, pemilu tahun ini nggak ada yang bahas pemilu sama sekali... forsaintis dah bosen sama politik...


Oktober 09, 2014, 01:25:15 PM
Capek debat adu khayal ala agama. Mendingan fokus ke hal hal exact.  ;)

Show 50 latest

Penulis Topik: Vitamin C dan plastik  (Dibaca 2835 kali)

0 Anggota dan 1 Pengunjung sedang melihat topik ini.

Offline reborn

  • Founder
  • Profesor
  • *****
  • Tulisan: 2238
  • IQ: 317
  • Gender: Pria
  • ForSa
    • Lihat Profil
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.


Topik Terkait

  Subyek / Dimulai oleh Jawaban Tulisan terakhir
3 Jawaban
5865 Dilihat
Tulisan terakhir Mei 22, 2009, 08:17:08 AM
oleh syx
2 Jawaban
5745 Dilihat
Tulisan terakhir November 23, 2009, 06:13:00 AM
oleh Mat Dillom
0 Jawaban
6279 Dilihat
Tulisan terakhir Juli 27, 2010, 04:33:45 PM
oleh windhu17
9 Jawaban
2629 Dilihat
Tulisan terakhir Agustus 31, 2010, 04:51:44 PM
oleh syx
Vitamin D

Dimulai oleh syx « 1 2 » Kesehatan

22 Jawaban
4745 Dilihat
Tulisan terakhir Agustus 25, 2011, 02:23:56 PM
oleh syx

Copyright © 2006-2014 Forum Sains Indonesia