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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
wypward(金币+1):谢谢参与 2010-10-13 17:49:41
hairongz(金币+5, 翻译EPI+1):谢了！ 2010-10-15 09:09:16
木子小木虫(金币+45):谢谢，继续努力 2010-10-19 10:27:53
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In the first month, the weight loss is 3%, which may has relationship with the composition in the small amount of foam that not involved in polymerization and dissolving out in the washing process. During the next four months, there is a little foam weight loss until the temperature rose to 10 after 6 months, then the weight loss rate increased obviously. The weight loss rate was towards to slow down After November. Generally, the rate of foam biodegradation is relatively slow,, that is annual weight loss is only 15.61%. This may be the soil micro-organisms to adapt to the urethane bond require a longer duration. In addition, for large bulk samples, the actual contact surface between the soil and the bubble is very small, and that is also an important reason. |
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