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suchanghong

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東昌莘(金幣+1): 鼓勵(lì)交流 2011-04-16 00:05:46

就算是線性高分子的溶解，首先也會(huì)發(fā)生溶脹過(guò)程，因?yàn)楦叻肿拥倪\(yùn)動(dòng)速度很慢，溶劑分子的擴(kuò)散速度很快，首先溶劑分子擴(kuò)散進(jìn)入高分子之間，導(dǎo)致高分子鏈逐漸松動(dòng)，鏈段逐漸向溶劑運(yùn)動(dòng)。只有整鏈進(jìn)入溶劑后，才完成溶解過(guò)程。

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11樓2011-04-15 16:42:52

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東昌莘(金幣+1): 鼓勵(lì)交流 2011-04-16 00:05:50

凝膠是以共價(jià)鍵結(jié)合的，化學(xué)生物作用能使其斷鍵降解，其他情況下是不容易離解的

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時(shí)間會(huì)把最正確的人帶到你的身邊，在此之前，你所要做的是好好照顧自己。

12樓2011-04-15 16:43:48

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學(xué)無(wú)止境zsf

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謝謝各位蟲(chóng)們的回答。學(xué)習(xí)了學(xué)習(xí)了。

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13樓2011-04-15 17:59:53

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isabella

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14樓2011-04-15 20:33:50

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andrasschiff

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混跡學(xué)界的學(xué)渣

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zznjut(金幣+1): 歡迎 2011-04-16 16:30:02

通過(guò)凝膠-溶膠法可能反應(yīng)時(shí)間不充分一般是固體

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老人不做攔路虎，青年不做拆橋人。

15樓2011-04-15 21:46:07

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學(xué)無(wú)止境zsf

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“可能是反應(yīng)時(shí)間不充分吧，一般是固體”。那生成的這種不溶固體凝膠，能在溶劑中清楚地看到嗎？比如說(shuō)在溶劑里是一團(tuán)，用濾紙過(guò)濾后能很明顯的分出來(lái)？
我溶解的時(shí)候，瓶子里挺混濁，過(guò)濾時(shí)有那么一點(diǎn)像紙?jiān)鼧拥臇|西，這個(gè)算是凝膠嗎？

多謝您的回答。我以前沒(méi)接觸過(guò)，一點(diǎn)都不懂

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16樓2011-04-15 22:00:55

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引用回帖:

Originally posted by 學(xué)無(wú)止境zsf at 2011-04-15 16:00:44:
能傳張照片看看嗎？凝膠是固體��？一直以為凝膠是果凍狀的東西呢？那我要想得到最終的凝膠，是不是我這個(gè)果凍狀東西交聯(lián)度還不夠呢？還需要進(jìn)一步交聯(lián)才行了？

我想做的是乳液，不要求它完全交聯(lián)的，不然成了固體就完蛋了

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17樓2011-04-15 22:55:53

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zznjut(金幣+2): 歡迎 2011-04-16 16:30:12

不懂的能不能不胡說(shuō)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.

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18樓2011-04-16 08:45:13

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floweralice

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不是凝膠，像塊肥肉。。。

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Eva

19樓2011-04-16 08:55:52

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你可以對(duì)你溶解后的溶液看看有沒(méi)有丁達(dá)爾現(xiàn)象~

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錯(cuò)過(guò)了美麗，是因?yàn)橛涀×藠^斗！

20樓2011-04-16 10:13:26

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