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iamvictorfan

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pengcil

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iamvictorfan(½ð±Ò+5):лл£¡ 2010-12-22 11:19:07
ÔÚÎÄÏ×Öп´µ½µÄ£¬¡°Model Networks Of End-Linked Polydimethylsiloxane Chains .1. Comparisons Between Experimental And Theoretical Values Of Elastic-Modulus And Equilibrium Degree Of Swelling¡±
Æäʵ˫¼üº¬Á¿²»ÊǺܸߵϰ£¬¼õѹÕôÁó¹ØÏµ²»ÊǺܴóµÄ

The polymers used in this investigation were two
samples of hydroxyl-terminated PDMS, hereafter designated
A and B, described as having molecular weights
the order of 2 x 104 and 1 xl 03 g morl , respectively. 26
Standard fractional precipitation techniquesl carried
out at 25¡ãC were used to separate these two polymers
into several fractions. Toluene was chosen as the
solvent and acetonitrile as the nonsolvent. (Methanol,
which is widely used as the nonsolvent in polymer
fractionations, cannot be used with polymer chains of
this type, which have potentially reactive end-groups).
Initial polymer concentrations were 1wt% in the case
of sample A and 5wt% in the case of sample B. Four
fractions (A-1 through A-4) were obtained from sample
A, and two (B-1 and B-2) from sample B; each represented
roughly 20% of the polymer from which it was
obtained.

[ Last edited by pengcil on 2010-12-22 at 10:33 ]
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iamvictorfan

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pandaandy

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iamvictorfan(½ð±Ò+2): 2010-12-22 10:22:42
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iamvictorfan

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