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suchanghong

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东昌莘(金币+1): 鼓励交流 2011-04-16 00:05:46
就算是线性高分子的溶解,首先也会发生溶胀过程,因为高分子的运动速度很慢,溶剂分子的扩散速度很快,首先溶剂分子扩散进入高分子之间,导致高分子链逐渐松动,链段逐渐向溶剂运动。只有整链进入溶剂后,才完成溶解过程。
11楼2011-04-15 16:42:52
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cuixun2008

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东昌莘(金币+1): 鼓励交流 2011-04-16 00:05:50
凝胶是以共价键结合的,化学生物作用能使其断键降解,其他情况下是不容易离解的
时间会把最正确的人带到你的身边,在此之前,你所要做的是好好照顾自己。
12楼2011-04-15 16:43:48
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学无止境zsf

铜虫 (小有名气)

谢谢各位虫们的回答。学习了学习了。
学无止境
13楼2011-04-15 17:59:53
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isabella

禁虫 (初入文坛)

本帖内容被屏蔽

14楼2011-04-15 20:33:50
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andrasschiff

铁杆木虫 (职业作家)

混迹学界的学渣


zznjut(金币+1): 欢迎 2011-04-16 16:30:02
通过凝胶-溶胶法 可能反应时间不充分 一般是固体
老人不做拦路虎,青年不做拆桥人。
15楼2011-04-15 21:46:07
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学无止境zsf

铜虫 (小有名气)

“可能是反应时间不充分吧,一般是固体”。那生成的这种不溶固体凝胶,能在溶剂中清楚地看到吗?比如说在溶剂里是一团,用滤纸过滤后能很明显的分出来?
我溶解的时候,瓶子里挺混浊,过滤时有那么一点像纸渣样的东西,这个算是凝胶吗?

多谢您的回答。我以前没接触过,一点都不懂
学无止境
16楼2011-04-15 22:00:55
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miles_lu

金虫 (正式写手)


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引用回帖:
Originally posted by 学无止境zsf at 2011-04-15 16:00:44:
能传张照片看看吗?凝胶是固体啊?一直以为凝胶是果冻状的东西呢?那我要想得到最终的凝胶,是不是我这个果冻状东西交联度还不够呢?还需要进一步交联才行了?

我想做的是乳液,不要求它完全交联的,不然成了固体就完蛋了
17楼2011-04-15 22:55:53
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cellulose1728

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zznjut(金币+2): 欢迎 2011-04-16 16:30:12
不懂的能不能不胡说八道?

gel分chemcial gel 和physical gel。

http://en.wikipedia.org/wiki/Gel
gel (from the lat. gelu—freezing, cold, ice or gelatus—frozen, immobile) is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state.[1] By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the crosslinks within the fluid that give a gel its structure (hardness) and contribute to stickiness (tack). In this way gels are a dispersion of molecules or particles within a liquid in which the solid is the discontinuous phase and the liquid is the continuous phase.

Types of gels
Hydrogels
Hydrogel (also called aquagel) is a network of polymer chains that are hydrophilic, sometimes found as a colloidal gel in which water is the dispersion medium. Hydrogels are highly absorbent (they can contain over 99% water) natural or synthetic polymers. Hydrogels also possess a degree of flexibility very similar to natural tissue, due to their significant water content. Common uses for hydrogels include

OrganogelsAn organogel is a non-crystalline, non-glassy thermoreversible (thermoplastic) solid material composed of a liquid organic phase entrapped in a three-dimensionally cross-linked network. The liquid can be, for example, an organic solvent, mineral oil, or vegetable oil. The solubility and particle dimensions of the structurant are important characteristics for the elastic properties and firmness of the organogel. Often, these systems are based on self-assembly of the structurant molecules.[2][3]

XerogelsA xerogel ( /ˈzɪərɵdʒɛl/) is a solid formed from a gel by drying with unhindered shrinkage. Xerogels usually retain high porosity (25%) and enormous surface area (150–900 m2/g), along with very small pore size (1-10 nm). When solvent removal occurs under hypercritical (supercritical) conditions, the network does not shrink and a highly porous, low-density material known as an aerogel is produced. Heat treatment of a xerogel at elevated temperature produces viscous sintering (shrinkage of the xerogel due to a small amount of viscous flow) and effectively transforms the porous gel into a dense glass.
18楼2011-04-16 08:45:13
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floweralice

金虫 (正式写手)

觉得玻璃和钻石一样美丽


小木虫(金币+0.5):给个红包,谢谢回帖交流
不是凝胶,像块肥肉。。。
Eva
19楼2011-04-16 08:55:52
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zhuguanjia

木虫 (小有名气)


小木虫(金币+0.5):给个红包,谢谢回帖交流
你可以对你溶解后的溶液看看有没有丁达尔现象~
错过了美丽,是因为记住了奋斗!
20楼2011-04-16 10:13:26
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