ABSTRACT

An eco-friendly sustainable thermal insulator has been developed as a replacement of some commercially available manmade materials to control heat transfer in case of buildings, and semi-permanent/temporary structures. Jute felts were prepared by needle pinching of fiber fleece. It is a self-sustained semi-rigid structure and could be placed on various surface profiles of the building/structure due to its balanced flexural rigidity and surface property of fiber. Effect of areal density, thickness, and number of layers of jute felt on its major thermal insulation property parameters were studied. Some major structural parameters of felts viz., pore size, bulk density, and air fraction as gas pockets in fibrous structure were analyzed and correlated with the insulation property. Felt having 500 g/m² areal density showed best specific thermal insulation performance. When it was used in four layers, its thermal insulation value reached up to 341 m²K/kW, which is much comparable to those of glass wool (320 m²K/kW), nitrile rubber (320 m²K/kW), and polystyrene (381 m²K/kW) insulators. The cost of jute felts ($ 2.81 for four layers of 500 g/m²) was much comparable to synthetics ($2.9 for glass wool and $ 2.7 for nitrile rubber) of similar thermal insulation value. It also facilitates remarkable saving of costly floor space to the extent of 28% as compared to synthetics. The ease of tailorability of jute felt was also studied by measuring drapability, tensile strength, tear strength, and energy required to cut the felt. Inherent multiple lumens within fiber structure, partial anisotropy of polymer chains, and innumerable tiny gas pockets within the felt structure are the major reasons for the high thermal insulation of jute felt.

摘要

已经开发出一种生态友好的可持续绝热材料，以替代一些市售的人造材料，以控制建筑物和半永久性/临时性结构的热传递。黄麻毡是通过针刺纤维羊毛制成的。它是一种自我维持的半刚性结构，由于其平衡的抗弯刚度和纤维的表面特性，可以放置在建筑物/结构的各种表面轮廓上。研究了黄麻毡的面密度，厚度和层数对其主要隔热性能参数的影响。分析了毡的一些主要结构参数，即纤维结构中气穴的孔径，堆积密度和空气分数，并将其与隔热性能相关联。毛毡500 g / m ²面密度显示出最佳的绝热性能。当以四层使用时，其绝热值达到341 m ² K / kW，与玻璃棉（320 m ² K / kW），丁腈橡胶（320 m ² K / kW）的绝热值相当。，以及聚苯乙烯（381 m ² K / kW）绝缘子。黄麻毡的成本（四层500 g / m ²的成本为2.81美元）的热绝缘值与合成纤维（玻璃棉为2.9美元，丁腈橡胶为2.7美元）相当。与合成材料相比，它还可以显着节省昂贵的地板空间，最多可节省28％。还通过测量悬垂性，抗张强度，撕裂强度和切割毡所需的能量，研究了黄麻毡容易适应性的问题。纤维结构内在的固有多个内腔，聚合物链的部分各向异性以及毡结构内无数的微小气穴是黄麻毡具有高隔热性的主要原因。