College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China; The Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, 610065, China.
College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China; The Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, 610065, China.
Carbohydr Polym. 2020 Feb 15;230:115582. doi: 10.1016/j.carbpol.2019.115582. Epub 2019 Nov 7.
One high-performance liquid starch-based mulching materials (LSMM) was successfully fabricated by grafting polyacrylic acid (PAA) onto starch then crosslinking with N,N'-methylene-bisacrylamide (MBA). The effects of the dosage of acrylic acid on the performances of LSMM film had been explored. The LSMM was characterized by FTIR, solid state C NMR, XRD and SEM. Their application performances by spraying the LSMM on the soil surface also had been discussed. The PAA grafted onto starch significantly improved the properties of LSMM film (tensile strength 20.89 MPa, elongation at break 59.19 %, water absorbency 68.58 g/g and solubility in water 4.5 %). The PAA broke the hydrogen bonds and reduced the crystallinity of starch molecule, which can form the compact structure in LSSM film. As a result, the LSMM showed excellent relative hygroscopicity, water retention, degradability (weight loss 72.61 %) and the effect of facilitating the growth and germination ratio (84.00 %) of lettuce.
一种高性能的基于淀粉的液体覆盖材料（LSMM）成功地通过将聚丙烯酸（PAA）接枝到淀粉上，然后用 N，N'-亚甲基双丙烯酰胺（MBA）交联制备而成。研究了丙烯酸用量对 LSMM 薄膜性能的影响。通过傅里叶变换红外光谱（FTIR）、固态 C 核磁共振（C NMR）、X 射线衍射（XRD）和扫描电子显微镜（SEM）对 LSMM 进行了表征。还讨论了将 LSMM 喷涂在土壤表面上的应用性能。接枝到淀粉上的 PAA 显著改善了 LSMM 薄膜的性能（拉伸强度 20.89 MPa，断裂伸长率 59.19%，吸水率 68.58 g/g，在水中的溶解度为 4.5%）。PAA 破坏了淀粉分子的氢键，降低了其结晶度，从而在 LSSM 薄膜中形成了致密的结构。结果，LSMM 表现出优异的相对吸湿性、保水性、降解性（失重 72.61%）和促进生菜生长和发芽率（84.00%）的效果。
