School of Science, RMIT University, Melbourne, VIC 3083, Australia; CSIRO Materials Science and Engineering, Clayton South, VIC 3169, Australia.
CSIRO Materials Science and Engineering, Clayton South, VIC 3169, Australia.
Carbohydr Polym. 2018 Oct 1;197:312-325. doi: 10.1016/j.carbpol.2018.06.019. Epub 2018 Jun 5.
One of the most critical limitations in synthesizing starch-polyurethane (PU) hybrid materials is their microphase separation caused by physical incompatibility. This paper reports that the physical incompatibility and microphase separation between starch and PU can be overcome by using specifically designed anionic poly(ether-ester) polyurethane (AEEPU). The AEEPU was synthesised by preparing isocyanate (NCO)-terminated prepolymer using Isophorone diisocyanate (IPDI), 2,2-bis(hydroxymethyl)propionic acid (BMPA), poly (ethylene glycol) (PEG) and polycaprolactone (PCL). This AEEPU was physically mixed with glycerol plasticized high amylose starch (HAGS) at HAGS to AEEPU mass ratios of 90/10, 80/20, 70/30, 60/40, 50/50. Higher AEEPU content in HAGS-AEEPU increased surface hydrophobicity and elasticity while the Young's modulus remained unaffected. HAGS-AEEPU film at 50:50 ratio was comparable to LDPE film in terms of elongation at break (187%), Young's modulus (383 MPa), and contact angle (112°) and good transparency. These starch-PU films are expected to find increased application as biodegradable packaging materials.
合成淀粉-聚氨酯（PU）杂化材料的最关键限制之一是由于物理不相容性而导致的微相分离。本文报道了通过使用专门设计的阴离子聚（醚酯）聚氨酯（AEEPU）可以克服淀粉和 PU 之间的物理不相容性和微相分离。通过使用异佛尔酮二异氰酸酯（IPDI）、2,2-双（羟甲基）丙酸（BMPA）、聚（乙二醇）（PEG）和聚己内酯（PCL）制备端异氰酸酯（NCO）预聚物来合成 AEEPU。该 AEEPU 与甘油增塑的高直链淀粉（HAGS）在 HAGS 与 AEEPU 的质量比为 90/10、80/20、70/30、60/40、50/50 时进行物理混合。在 HAGS-AEEPU 中，AEEPU 的含量越高，表面疏水性和弹性越高，而杨氏模量保持不变。在断裂伸长率（187%）、杨氏模量（383MPa）和接触角（112°）方面，HAGS-AEEPU 薄膜在 50:50 比例下与 LDPE 薄膜相当，并且具有良好的透明度。这些淀粉-PU 薄膜有望作为可生物降解包装材料得到更广泛的应用。
