Table 1: The color and color codes of the synthesized polymers.
Synthesis and Polymer Technology - Fraunhofer IAP
Control of polymerization by means of catalysts and additives has led to a large variety of materials based on polyethylene that exhibit differences in densities, degrees of chain branching and crystallinity, and cross-linking. Some major types are low-density (LDPE), linear low density (LLDPE), high-density (HDPE).
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The Number of average molecular weight of the synthesized polymers were determined by GPC method. The analyses were performed by using an Agilent 1200 Series. Average molecular weight of polymer II obtained by conventional heating was found as 3406 g /mol while that of its counterpart synthesized by microwave was found as 4000 g/mol. In terms of the polymers that synthesized under MI, the polydispersity index (PDI) values that determined for the polymers I, II, III, VI and VII were lower than the value calculated for the polymers synthesized under CH and were more closer to the value of 1. Li et al. reported that molecular weight and PDI values for P-NPAPA polymer 2780 and 1.25, However we defined these values for polymer 3 as 3000, 1.12 for MI method and 2250, 1.30 for CH method . Molecular weights and heterogeneous distribution values obtained from GPC diagram for polymers synthesized with microwave and traditional are presented in Table 5.
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General procedures under microwave irradiation (MI): Polymerization process was implemented with free radical polymerization and it was used azobisisobutyronitrile as initiator. Household type microwave oven was used for the microwave irradiation. Polymerization reaction was applied as follows: a dry glass tube (10 mL) was filled with the mixture of 5 mmol azoacrylate monomer, 2.6 × 10-2 mmol initiator (azobisisobutyronitrile, AIBN) and 5 mL DMF as solvent. The reaction mixture was consecutively degassed through vacuum, charged with N2 (five cycles), sealed under N2, placed into a self-improved in-house microwave oven and refluxed within CCl4 for an hour. This reaction was ended by immersing the tube in ice-water. After sufficient time, the reaction mixture was poured into a large excess of methanol. In order to remove unreacted monomer, the suspension was filtered. The obtained polymers were purified by precipitating from THF by adding of methanol and dried under vacuum at room temperature. The color and color codes of the resulting polymers are shown in Table 1.