Sodium alginate (SA) is a renewable material with broad application prospects in textiles, medicine, and other fields. However, the disadvantage of poor strength and brittleness limited its future application. In this work, the SA was reinforced by the hydroxypropyl methyl cellulose (HPMC) with a semi-interpenetrating network which leverages the favourable properties. The structure and surface morphology of SA/HPMC blend membranes after Ca ion cross-linking were examined by FTIR, Raman, XRD and SEM. The mechanical properties and water absorbency of the blend membranes were also studied. The results indicated that the hydrogen bond was found in SA/HPMC blend membranes, which improved the SA/HPMC blend membranes stability. Compared with calcium alginate membrane, the tensile strength and elongation at break of SA/HPMC blend membranes were improved to 57 % and 400 %, respectively.

海藻酸钠（SA）是一种可再生材料，在纺织品，医药等领域具有广阔的应用前景。但是，强度和脆性差的缺点限制了其未来的应用。在这项工作中，通过具有半互穿网络的羟丙基甲基纤维素（HPMC）增强了SA，从而利用了良好的性能。通过FTIR，拉曼光谱，XRD和SEM对SA / HPMC共混膜Ca离子交联后的结构和表面形貌进行了研究。还研究了共混膜的机械性能和吸水率。结果表明，SA / HPMC共混膜中存在氢键，提高了SA / HPMC共混膜的稳定性。与海藻酸钙膜相比，