| Calotropis gigantean fiber is natural cellulose fiber, with smooth longitudinal surface smooth, without natural twist and high degree of hollowness on the cross section. This kind of fiber has a wide prospect for development and utilization. There is a layer of membrane at fiber’s surface after fiber’s treatment and then the tensile properties of every single fiber are measured which including the measurement of elastic modulus, strength per size and breaking extension ratio. We must test lots of fiber samples to get representative experimental data. It is very meaningful for grasping textile’s final mechanical property to conduct a research in every single fiber’s mechanical property.Results are summarized as follows:1. The influence to calotropis gigantean fiber’s property of fiber’s pretreamnet.After pretreated by ethyl alcohol fiber’s strength per size, elastic modulus are declined and breaking extension ratio is improved. Fiber’s hydrophilic performance is improved and it provides basic condition for forming a layer of membrane on the surface of fiber.(2) When calotropis gigantean fiber is treated with ultrasonic wave and ethyl alcohol is used as solvent, fiber’s strength per size and elastic modulus are improved with the treating time increasing and fiber’s breaking extension ratio is opposite.(3) When calotropis gigantean fiber is treated with different concentration ammonium carbonate solution, fiber’s strength per size and elastic modulus are declined at first and then improved with ammonium carbonate solution concentration improving. Fiber’s breaking extension ratio is opposite.2. Influence of calotropis gigantea’s performance dealing with waterborne polyurethane used by different treating way(1) The changes of strength per size and elastic modulus has significant differences and breaking extension ratio doesn’t make a great difference when dealt with 10%,20% and 30% waterborne polyurethane and its elastic modulus is increasing with the concentration of waterborne polyurethane when the fiber is treated by the first method. According to the testing results of SEM, there is a layer of membrane covering in the surface of calotropis gigantea fiber when dealt with waterborne polyurethane.(2) The changes of strength per size, elastic modulus and breaking extension ratio has significant differences when calotropis gigantea fiber is treated by 5%, 10%, 20%, 30% waterborne polyurethane by the second method. Its elastic modulus increases from 141.23 cN/dtex to 338.17~788.43 cN/dtex. It’s strength per size is increased from 2.86 cN/dtex to 5.97~21.05cN/dtex. It’s breaking extension ratio are 1.67~2.17%. According to the testing results of SEM, there is a smooth membrane on the surface of the fiber and this membrane improves fiber’s tensile property.(3) Comparing with two treating method, fiber treated by the second method has better elastic, strength per size and breaking extension ratio.3. The influence to calotropis gigantean fiber’s property forming membrane as physical way.(1) Strength per size and elastic modulus of Calotropis gigantean fiber are improving with solution’s concentration improving after they are treated by starch solution, Sodium Carboxymethyl Starch solution and polyving akohol solution. The changes of strength per size, elastic modulus and breaking extension ratio had significant differences when dealt with different concentration of starch solution, Sodium Carboxymethyl Starch solution and polyving akohol solution. According to the testing results of SEM, there is a layer of membrane covering in the surface of calotropis gigantea fiber when dealt with solution’s concentration growing. The thickness of of membrane are increasing with solution concentration’s growth.(2) Calotropis gigantea fiber is treated by polyving akohol whose alcoholysis degree is 99% and polymerization degree is 1700, 2000, 2400, 26000 respectively. According to experiment result, elastic modulus, strength per size and breaking extension ratio are increasing with the growth of polyving akohol polymerization degree’s growth when they have the same concentration.(3) A comparison of tensile properties of different calotropis gigantea fiber when treated by different film-forming agent.(a) Comparing calotropis gigantea fiber’s tensile properties when treated by starch solution, sodium Carboxymethyl Starch solution and polyving akohol solution, polyving akohol solution with better elastic modulus, strength per size and breaking extension ratio has the best treatment effect under the same concentration. Ranking by treatment effect is that polyving akohol is best, Sodium Carboxymethyl Starch solution is the second and starch solution is the last.(b) There is a layer of membrane on the surface of fiber when dealt with starch solution, Sodium Carboxymethyl Starch solution and polyving akohol. The membrane is more smooth and continuous when dealt with polyving akohol and it is better to improve fiber’s tensile property.4. The influence of fiber’s tensile property when treated by film-forming agent that can form three-dimensiona mesh.(1) This paper uses ethidene diam, diethylenetriamine or m-phenylenediamine as curing agent to solidify ethoxyline resin at room temperature, acetone as diluting agent to dilute ethoxyline resin. Calotropis gigantea fiber was treated by different diluted concentration ethoxyline resin and solidified at room temperature. The changes of strength per size, elastic modulus and breaking extension ratio had significant differences when ethoxyline resin is solidified on the surface of fiber by different solidified agent. The elastic modulus and strength per size are increasing with the gowth of solution concentration.(2) A comparison of the effect when epoxy resin is solidified with ethidene diamine, diethylenetriamine or m-phenylenediamine on the surface of the fiber at room temperature. Ethidene diamine has better solidified effect than other solidified agents. |
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