· Mõned konkreetsed näited: Polüuretaani valmistatakse põhiliselt isotsüanaatidest ja polüolidest. · Esimeseks muudetakse etaan etüleeniks. Esmalt jahutatakse etaani -100C ni. Seejärel võetakse kondenseerunud etaan ning viiakse edasi järgmisesse staadiumisse, kus see kuumutatakse 850C. Tekib H2 ja eteen-mida on vaja. Edasi saadetakse see protsessi, mille käigus on saadakse eteeni pelletid. · Cellulose is the most common organic compound and biopolymer on Earth. About 33 percent of all plant matter is cellulose. The cellulose content of cotton is 90 percent, while wood's is 50 percent. [7] · Keemiline koostis sõltub sellest, mis plastiga on tegemist. Suurem osa polümeere saadakse toorõlist saadavatest süsinikest. See tähendab, et need on sünteetilised. Kuid samuti on võimalik valmistada naturaalseid polümeere looduslikest molekulidest.
258 Chapter 13 as biodegradable plastic in their products’ “NatureTray” product aimed at fresh meat. packaging. This is particularly important in Both these companies use a foam form that the European Union, where many countries is derived from 100% annually renewable are considering tougher legislation to encour- resources. In the future, we can hope to see age the use of less packaging material (Dodds even more applications for renewable pack- 2007). Biopolymer films may serve as poten- aging materials in the packaging of meat tial replacements for synthetic films in food products. These products will address the packaging applications to address strong various technical challenges of MAP and marketing trends toward more environmen- vacuum packaging and overcome the gas tally friendly materials, but hydrophilicity is permeability issues required to make such
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