NOPR Community:

Simple method for measurement of feltability of rabbit hair

2016-07-20T05:52:14Z

Title: Simple method for measurement of feltability of rabbit hair Authors: Voráč, J; Štork, V; Saul, P; Gancarčik, T Abstract: In this work, a simple method for testing the felting propensity of carded top prepared from chemically treated, short and thick animal hairs, together with the necessary devices has been developed. Similar to the Aachen felting test, external force is applied to the wet sample of the fibres until felting occurs. The felting propensity is then determined from the dimensions of the resulting felted body. The main difference is that the sample is prevented from disintegration during the procedure that usually occurs, when a standard Aachen test is applied. Page(s): 458-462

Microwave-assisted non-thermal hemp degumming

2016-07-20T05:38:44Z

Title: Microwave-assisted non-thermal hemp degumming Authors: Qu, Lijun; Zhu, Shifeng; Tian, Mingwei; Guo, Xiaoqing; Han, Guangting; Zhang, Yan; Tang, Xiaoning; Sun, Kaikai Abstract: The microwave-assisted non-thermal degumming of hemp fibre has been studied and then compared with the water bath heating under different time and temperature conditions. The results show that the residual gum content of the lean hemp using microwave-assisted heating method is lower than that obtained using water bath heating. The residual gum content gap between the two degumming processes increases first and then decreases as the heating time and temperature are increased. This proves the existence of non-thermal effects in microwave heating process besides the thermal effects in water bath heating. In addition, the structures of the lean hemp fibres obtained from these two methods are also studied by scanning electron microscopy and fourier transform infrared spectroscopy. Page(s): 453-457

Comparison of biopolymer finishing with functional finishing on wool fibre

2016-07-20T05:49:06Z

Title: Comparison of biopolymer finishing with functional finishing on wool fibre Authors: Lakshmanan, Ammayappan; Lee, Jong Soon; Jeyaraj, Jeyakodi Moses; Kochadai, Ashok Senthil Abstract: Wool: cotton union fabric has been applied with chitosan biopolymer to impart shrink-proof finish and its performance is compared with two synthetic polymer finishes. Results show that chitosan forms thin film on the surface of wool fibre as in synthetic finishing polymer. The diffusion of chitosan biopolymer inside the wool fibre matrix is found to be better than synthetic polymer, which is confirmed by the cross-sectional view of finished wool fibre. It is concluded that chitosan biopolymer could be preferred over other synthetic polymer to prevent shrinkage of woollen textiles. Page(s): 447-452

Effects of molecular structure of acrylates on sizing performance of allyl grafted starch

2016-07-20T05:46:51Z

Title: Effects of molecular structure of acrylates on sizing performance of allyl grafted starch Authors: Jin, Enqi; Li, Manli; Xi, Bojun; Ye, Qiujuan Abstract: In order to improve the performance of allyl starch-g-poly(acrylic acid-co-acrylate) sizes, effect of molecular structure of the acrylate monomers grafted onto allyl starch has been studied. A series of acrylates including methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA) and 2-ethylhexyl acrylate (EHA) have been grafted onto allyl starch with the same degree of substitution through the initiation of Fe(NH₄)₂(SO₄)₂/H₂O₂ redox system respectively. Meanwhile, acrylic acid (AA) is also graft copolymerized to maintain good water-dispersibility of the grafted starch. Then the properties of the grafted allyl starch, such as the apparent viscosity, viscosity stability, and adhesion to polyester fibres and the mechanical properties of sizing film, have been studied. It is found that by grafting acrylates onto the molecular chains of starch, the sizing performance of the allyl starch is improved markedly. Under the same feed ratio of the acrylic monomers to allyl starch, allyl starch-g-poly(AA-co-MA) shows higher paste viscosity, viscosity stability, and film elongation than the other kinds of grafted allyl starch. Allyl starch-g-poly(AA-co-EA) also shows higher film strength than the other ones. Both of the allyl starches grafted with MA and EA show higher abrasion resistance of sizing film and better adhesion to polyester fibres. Page(s): 437-446