洗碗工

Few studies have systematically investigated the influence of
polymer molecular weight (MW) on the physical properties of
PEM, whether for synthetic polyelectrolytes[44] or for natural
polyelectrolytes. One of the reasons is the difficulty in obtaining
monodispersed polymers, especially for natural polyelectrolytes
which have very diverse production methods and are subjected to
natural variation. Kujawa et al.[45] found that CHI/HA film
thickness increased when the MW of these polysaccharides was
higher. However, this effect was only attributed to a difference in
film growth onset and not to actual differences in mass deposited
per layer. Lynn and co-workers[35] used the (PAH/PAA) synthetic
film model to underline the importance of MW in the buildup
process. With lower MW PAA, they observed that growth
approached that of exponentially growing systems. The use of low
MW PAA instead of a higher MW (the one commonly used and
commercially available) made it possible to diffuse it within these
films, resulting in thicker and exponentially growing films. Such
differences in diffusion were also observed by Porcel et al.,[46] who
studiedMWchanges in the PLL/HA system. Changes in PLL and
HA MWdid not significantly affect the mass deposited per layer,
but the use of highMWPLL did restrain PLL diffusion within the
upper part of the film. Most of the investigations that focused on
the influence of polymer length essentially studied the influence
on the film growth curve and thickness, with other properties,
mechanical, for example, rarely investigated.[47] Overall, both the
nature of diffusing specie and its length are important.
from huiyisu@126.com

贊一下

回復(fù)此樓

16樓2012-05-04 11:21:31

已閱回復(fù)此樓關(guān)注TA 給TA發(fā)消息送TA紅花 TA的回帖

最具人氣熱帖推薦 [查看全部]	作者	回/看	最后發(fā)表

[考研] 288資源與環(huán)境專碩求調(diào)劑，不限專業(yè)，有學上就行 +23	lllllos 2026-03-30	23/1150	2026-04-01 01:34 by 1018329917
[考研] 材料調(diào)劑 +3	一樣YWY 2026-03-31	3/150	2026-03-31 23:02 by wxiongid
[考研] 273求調(diào)劑 +8	李芷新1 2026-03-31	8/400	2026-03-31 22:15 by 天倌賜福
[考研] 086000生物與醫(yī)藥298調(diào)劑求助 +3	元元青青 2026-03-31	5/250	2026-03-31 19:58 by vgtyfty
[考研] 336材料求調(diào)劑 +10	陳瀅瑩 2026-03-26	12/600	2026-03-31 17:59 by jp9609
[考研] 086000調(diào)劑 +5	7901117076 2026-03-26	5/250	2026-03-31 17:45 by 544594351
[考研] 322求調(diào)劑：一志愿湖南大學材料與化工（085600），已過六級。 +10	XX小鄧 2026-03-29	10/500	2026-03-31 16:46 by 不吃魚的貓
[考研] 266求調(diào)劑 +3	哇呼哼呼哼 2026-03-29	3/150	2026-03-31 10:06 by cal0306
[考研] 22408 359分調(diào)劑 +4	Qshers 2026-03-27	8/400	2026-03-31 08:53 by Qshers
[考研] 食品工程專碩一志愿中海洋309求調(diào)劑 +5	小張zxy張 2026-03-26	10/500	2026-03-31 00:29 by jp9609
[有機交流] 甲基亞磺磺酸鈉和甲基磺酸酯反應(yīng)機理 10+3	kaobao456 2026-03-29	4/200	2026-03-30 23:16 by nBu鋰
[考研] 生物學學碩，一志愿湖南大學，初試成績338 +7	YYYYYNNNNN 2026-03-26	9/450	2026-03-30 20:29 by YYYYYNNNNN
[考研] 考研調(diào)劑 +5	Sanmu-124 2026-03-26	5/250	2026-03-30 13:36 by chemdavid
[考研] 一志愿北京理工大學本科211材料工程294求調(diào)劑 +8	mikasa的圍巾 2026-03-28	8/400	2026-03-29 12:48 by 無際的草原
[考研] 085701環(huán)境工程，267求調(diào)劑 +16	minht 2026-03-26	16/800	2026-03-28 12:16 by zllcz
[考研] 352分化工與材料 +5	海納百川Ly 2026-03-27	5/250	2026-03-28 03:39 by fmesaito
[考研] 085600，材料與化工321分，求調(diào)劑 +9	大饞小子 2026-03-27	9/450	2026-03-27 14:30 by mmm just
[考研] 315調(diào)劑 +4	0860求調(diào)劑 2026-03-26	5/250	2026-03-27 11:23 by wangjy2002
[考研] 考研調(diào)劑 +9	小蠟新筆 2026-03-26	9/450	2026-03-27 11:10 by 不吃魚的貓
[考研] 07化學303求調(diào)劑 +5	睿08 2026-03-25	5/250	2026-03-25 22:46 by 418490947