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Therefore, to terminate the polymerization, a quenching agent must be added, such as a strong acid to protonate the polymer, or a nucleophile to add an end cap the polymer. If the π-complex is too weakly bound, termination of polymer chains can occur before a quenching agent is added, causing lower molecular weight polymers to form.
NatureWorks LLC is an international company that manufactures bioplastics—polymers derived entirely from plant resources—as an alternative to conventional plastic, which is made from petroleum. The commercial quality polymer is made from the carbon found in simple plant sugars such as corn starch to create a proprietary polylactic acid ...
The numbers on a credit card help identify the credit card network, the company that issued the card and the cardholder. ... Your credit card account number forms part of your card number, but the ...
The total number of radicals delivered to the system by the initiator during the course of the polymerization is low compared to the number of RAFT agent molecules, meaning that the R group initiated polymer chains from the re-initiation step form the majority of the chains in the system, rather than initiator fragment bearing chains formed in ...
The synthesis of succinic acid based polyesters was first performed in 1863. In that time the Portuguese professor Agostinho Vicente Lourenço described in his "Recherche sur les composés polyatomiques" (Research on polyatomic compounds), the reaction between succinic acid and ethylene glycol to form what he named "succino-ethylenic acid".
Poly(p-phenylene) (PPP) is made of repeating p-phenylene units, which act as the precursor to a conducting polymer of the rigid-rod polymer family. The synthesis of PPP has proven challenging, but has been accomplished through excess polycondensation with the Suzuki coupling method. [1] [2]
Because of the long chain and various conformation, it is hard for the polymers to be crystallized directly from solution. Few examples of polymer single crystals prepared in this way suffered from low quality and small size. [26] Topochemical polymerization provides a potential solution to yield high-quality polymer single crystals.
It is a synthetic acrylate polymer derived from methyl acrylate monomer. The polymers are colorless. This homopolymer is far less important than copolymers derived from methyl acrylate and other monomers. PMA is softer than polymethyl methacrylate (PMMA), [1] It is tough, leathery, and flexible. [2]