Poly -grafted amylose

Figure /. Degradation behavior of poly(lactic acid)-grafled amyloses and poly(lactic acid) in l/15M-KH2P04-Na2HP04 (pH = 7.0) at 37 C with or without a-amylase in vitro. and A poly(Iactic acid)-grafted amylose (content of sugar unit = 25 wt%), B and poly(lactic acid)-grafted amylose (content of si ar unit = 25 wt%), B and O Poly(lactic acid), , B and with a-amylase, A, and B without a-amylase.

In the context of this chapter, the use of thermoplastic starch in blends with thermoplastic resins is of the main interest. As shown in Table 16.11, several blends have been developed, e.g., with vinyl alcohol copolymers (EVAl), polyolefins, aliphatic polyesters such as poly-e-caprolactone (PCL) and its copolymers, or polymers of glycols (e.g., 1,4-butanediol) with succinic, sebacic, adipic, azelaic, decanoic or brassihc acids, PCL + PVC. Compatibilization is possible by amylose/EVAl V-type complexes, starch grafted polyesters, chain extenders like diisocyanates, epoxies, etc. [Bastioli et al., 1992, 1993]. 

Additional aging effects could be found for graft copolymers (starch-acrylamide copolymers [36], synthetic amylose [36],poly(acrylamide-co-methacryloxyethyl-N,N,N,-trimethylammoniumchloride) PAAm/M [30] and poly(acrylamide-co-sodium-2-sulfoethylmethacrylate) [37]. 

Scheme 16. Synthetic approach of amylose-grafted poly(L-glutaniic acid) (50).

Braunmuhl, V. V., Jonas, G. Stadler, R. (1995). Enzymatic grafting of amylose from poly(dimethylsiloxanes). Macromolecules, 28, 17-24. 

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