24小时热门版块排行榜    

查看: 8631  |  回复: 8
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

cuihuapeng

木虫 (正式写手)

[交流] 【交流】聚合物中PDI是什么意思(完毕) 已有8人参与

请问,聚合物粒径测试试验中所说的PDI是什么意思啊??

[ Last edited by cuihuapeng on 2010-5-29 at 20:03 ]
回复此楼
加油!
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

小蚂蚁1980

木虫 (著名写手)

就是分子量分布指数
6楼2010-05-29 21:50:17
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 9 个回答

QLiu2628

铁杆木虫 (著名写手)

PDI:多分散性指数

★ ★ ★ ★
cuihuapeng(金币+2):谢谢! 2010-05-29 20:01:36
薰衣草儿(金币+4):2楼解释最详细,应该多给一些~欢迎讨论~ 2010-05-29 22:06:37
多分散性指数
wikipedia: In organic chemistry, the polydispersity index (PDI), is a measure of the distribution of molecular mass in a given polymer sample. The PDI calculated is the weight average molecular weight divided by the number average molecular weight. It indicates the distribution of individual molecular masses in a batch of polymers. The PDI has a value equal to or greater than 1, but as the polymer chains approach uniform chain length, the PDI approaches unity (1). For some natural polymers PDI is almost taken as unity. The PDI from polymerization is often denoted as:
PDI=Mw/Mn


Mn is more sensitive to molecules of low molecular mass, while Mw is more sensitive to molecules of high molecular mass.

A polymer material is denoted by the term polydisperse if its chain lengths vary over a wide range of molecular masses. This is characteristic of man-made polymers.[1]. Natural organic matter produced by the decomposition of plants and wood debris in soils (humic substances) has also a pronounced polydispersed character. It is the case of humic acids and fulvic acids, natural polyelectrolyte substances having respectively higher and lower molecular weights.
PSaveatree...pleaseDONOTprintthispageunlessyoureallyneedto.
2楼2010-05-29 19:48:56
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

wpz.219

铁杆木虫 (著名写手)

2楼的解释很详细啊
5楼2010-05-29 21:23:01
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

小雷——

铜虫 (初入文坛)


小木虫: 金币+0.5, 给个红包,谢谢回帖
Polydispersed index(PDI)多分散指数,PDI=数均粒径/重均粒径,当然是越接近1越好,均一性好
9楼2021-10-19 08:12:29
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[论文投稿] 售SCI一区T0P文章,我:8.O.55.1.O.5.4,科目全,可+急 +3 QTy3jDtz1uLt 2026-08-21 8/400 2026-08-22 23:51 by OEbVnUOu01ol
[硕博家园] 售SCI一区T0P文章,我:8O.55.1.O.54,科目全,可伽急 +4 QTy3jDtz1uLt 2026-08-21 10/500 2026-08-22 23:42 by OEbVnUOu01ol
[硕博家园] 售SCI一区T0P文章,我:8.O.55.1.O54,科目全,可伽急 +3 2JOx3r2CYEgw 2026-08-22 3/150 2026-08-22 22:03 by OEbVnUOu01ol
[硕博家园] 售SCI一区文章,我:8O5.5.1.O5.4,科目全,可伽急 +3 2JOx3r2CYEgw 2026-08-22 5/250 2026-08-22 21:42 by OEbVnUOu01ol
[教师之家] 跳槽后在研项目怎么办? +3 简单化xn 2026-08-22 7/350 2026-08-22 19:46 by 简单化xn
[基金申请] 什么时候开奖? +7 CrisMessi 2026-08-18 8/400 2026-08-22 18:29 by 淀粉搬运工
[基金申请] filecode,4个jtjc了 +13 ziyangfang 2026-08-19 16/800 2026-08-22 17:08 by WH3796
[教师之家] 售一区SCI文章T0P,我:8O.551.O54,科目全,可十急 +4 2JOx3r2CYEgw 2026-08-21 4/200 2026-08-22 16:52 by sunzitan
[基金申请] 人气不行了 +8 fansofjerry 2026-08-21 8/400 2026-08-22 16:30 by zyqchem
[基金申请] 放榜前的不淡定 40+4 snowwithsea 2026-08-19 14/700 2026-08-21 23:51 by cratir
[基金申请] 建议基金发布提前给出明确的时间点 +10 kulium 2026-08-21 13/650 2026-08-21 21:58 by alongwaytogo
[基金申请] 科研孤儿太难了 +17 我4大白菜 2026-08-20 18/900 2026-08-21 20:57 by zhangev
[基金申请] 时间戳又变了 +13 wuchongjun 2026-08-20 19/950 2026-08-21 17:21 by 紫杉醇
[基金申请] 让我中一个面上吧! +11 大萍1987 2026-08-20 13/650 2026-08-21 14:48 by 20120902066
[论文投稿] 投稿咨询 +5 wwm09 2026-08-17 7/350 2026-08-21 10:11 by 期刊论文帮手
[基金申请] 今天放榜没戏了吧 +9 yuleib84 2026-08-19 11/550 2026-08-21 10:06 by gltch
[基金申请] 基金啊基金 +4 longfie172 2026-08-20 4/200 2026-08-21 08:58 by mark mao
[基金申请] 估计是周四 +3 archvillain 2026-08-18 3/150 2026-08-21 01:48 by jnhyjjm
[基金申请] 重要消息,中午系统在维护 +11 yuleib84 2026-08-18 12/600 2026-08-20 11:09 by xskun
[基金申请] 今天维护系统维护 祝所有人 高中 +8 gjjjzhong 2026-08-18 9/450 2026-08-18 13:01 by 家与远方
信息提示
请填处理意见