Polyethylene adipate

We report here that polyethylene adipate (PEA) and polycaprolactone (PCL) were degraded by Penicillium spp., and aliphatic and alicyclic polyesters,ester type polyurethanes, copolyesters composed of aliphatic and aromatic polyester (CPE) and copolyamide-esters (CPAE) were hydrolyzed by several lipases and an esterase. Concerning these water-insoluble condensation polymers, we noted that the melting points (Tm) had a effect on biodegradability. 

Polyethylene adipate Polyethylene suberate Polyethylene azelate Polyethylene sebacate Polyethylene decamethylate Polytetraunethylene succinate Polytetramethylene adipate Polytetramethylene sebacate Polyhexamethylene sebacate Poly-2,2-dimethyItrimethylene succinate... 

Aliphatic polyesters, such as polyethylene adipate, have the following repeating unit ... 

The best physical properties are obtained with polyethylene adipate as the backbone. After the manufacture of the prepolymer with the polyethylene adipate and NDI, the polyurethane was completed with the addition of BDO. The use of diamines gave too fast a reaction for successful processing. Water and glycols also were used for cross-linking. Glycols do not give the C02 gas the water chain extension does. 

Watanabe M, Yoshie N (2006) Synthesis and properties of readily recyclable polymers from bisfuranic terminated polyethylene adipate) and multi-maleimide linkers. Polymer 47 4946 1952... 

Tokiwa, Y. Suzuki, T. (1977). Microbial-degradation of poly esters 3. Purification and some properties of polyethylene adipate-degrading enzyme produced by Penicillium sp strain 14-3. Agricultural and Biological Chemistry, 41, 265-74. 

Weisfeld (44) compared the catalytic activity of various metal acetyl-acetonates by measuring the time required for a certain polyethylene adipate ester-diphenylmethane-diisocyanate mixture to reach a predetermined viscosity in the presence of the catalyst and also used the same technique for determining the catalytic order n defined by... 

Indeed most polymers are receptive to attack including cellulose nitrate, cellulose acetate, polycaprolactone, polyethylene succinate, polyethylene adipate, polyvinyl alcohol, polybutadiene, styrene butadiene, butyl acrylonitrile, butadiene acrylonitrile, polyester polyurethanes, polyacetate, polyglycollate, polydioxanone and Nylon 2,6. 

Scheme 23. Synthesis of TEMPO-terminated polyethylene adipate) [231]...

Fig. 7. Effect of the co-monomei on the gks 4iansition temperature of the copolyestex A PET/polyethylene-adipate B PET/polyethylene utaiate ...

Greater success was achieved by DuPont who copolymerized, the sodium salt of 5-sulfoisophthalic acid into PET to render the polymer dyeable with cationic (basic) dyes. Basic dyeable PET was successfully launched as Dacron 64 in the form of a low-pill staple product [64]. The presence of the sulfonate groups in the polymer chain also acts as an ionic dipolar cross-link and increases the melt viscosity of the polymer quite markedly. Thus, it is possible to melt-spin polymer with IV 0.56 under normal conditions, giving a low-pill fiber variant. The fiber also has a greater affinity for disperse dyes due to the disruption of the PET structure. Continuing this theme, there are deep dye variant PET fibers, often used in PET carpet yarns, which are copolymers of PET with chain-disrupting copolymer units like polyethylene adipate. They have less crystallinity and a lower Tg. therefore, they may be dyed at the boil without the use of pressure equipment or carrier at the cost of some loss of fiber physical properties. 

In a similar study, the FAB mass spectrum of a copolyester obtained by melt-mixing polyethylene terephthalate (PET) and of polyethylene adipate (PEA) was recorded. The authors computed the number average length of adipate and terephthalate blocks by applying chain statistics. The result was Uea = 7.1 Uet = 2 implying that the initial copolymer, obtained by meltmixing of the two polyesters, has a Markoffian (block) distribution of tire monomer sequence/ ... 

In the PU synthesis we started from one mole of hydroxy-terminated macro-diol which was either a polyester type—polyethylene adipate (PEA) or a polyether type—polytetrahydrofuran (PTHF). 

Final PU elastomer containing molecular dispersed HO-A-OH (0.58%) where M = polyethylene adipate... 

MOLECULAR WEIGHT INFLUENCES ON THE PHYSICAL PROPERTIES OF POLYETHYLENE ADIPATE-BASED ELASTOMERS (WITH NDI)... 

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