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9. Huggins²ÎÊý?1µÄÎïÀíÒâÒåÊÇʲô£¿?1ÓëÈܼÁÐÔÖÊ¡¢Î¶ȵÈÓкιØÏµ£¿

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10. ¸ß·Ö×ÓÈÜÒº·¢ÉúÏà·ÖÀëµÄÁÙ½çÌõ¼þÊÇʲô£¿ÓÉ´ËÍÆ³öµÄÁÙ½çÏà·ÖÀë²ÎÊýÓë·Ö×ÓÁ¿ÓкιØÏµ£¿ÔÚ·¢ÉúÏà·ÖÀëºó£¬Æ½ºâµÄÁ½Ïà¼äÓкιØÏµ£¿ ´ð£º¸ß·Ö×ÓÈÜÒº·¢ÉúÏà·ÖÀëµÄÁÙ½çÌõ¼þÊÇ

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11. ½«0.1273gÃܶÈΪ0.941g/cm3µÄ½»Áª¶¡±½Ïð½ºÔÚ198K±½ÖÐÈܽ⣬ƽºâºó£¬ÈÜÕÍÌå×ÜÖØ

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2.116g¡£ÒÑÖª±½µÄÃܶÈΪ0.8685g/cm£¬?1=0.398£¬Çó¶¡±½Ï𽺵ÄÓÐЧÁ´µÄƽ¾ù·Ö×ÓÁ¿¡£ 0.12732.116?0.1273?5Mc1V2?V1?2?10.9410.8685???17.93£¬ÓÉQ3?´ð£ºQ?~(??1) W20.1273V2?2V120.941?2~5?V0.941?78/0.868521µÃ£¬Mc?Q3?17.935/3?1.02?105

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12. If ? for water is equal to 23.4H, what is the CED for water? ´ð£ºCED=? 2= 23.42=547.56cal/cm3¡£

13. Will a polymer swollen by a solvent have higher or lower entropy than solid polymer? ´ð£ºA polymer swollen by a solvent has higher entropy than solid polymer.

14. It is observed that a styrene -butadiene copolymer (?=16.5) is insoluble in pentane (?=14.5) and ethyl acetate (?=18.6), but soluble in a 1:1mixture of the two. Explain. ´ð£ºThe solubility parameter of the mixture is (14.5+18.6)/2=16.55, which is close to that of the copolymer.

15. Why do ? values decrease as the molecular weight increases in a homologous series of aliphatic polar solvents?

´ð£ºAs the molecular weight increases in a homologous series of aliphatic polar solvents, the density of the polarity of the solvents will decrease, the ? values then decrease.

16. Calculate the free energy of mixing 100g of polystyrene, of molecular weight 100,000, with

18

1000g of benzene at 298K. Take ?1=0.23 and assume that the polymer and the solvent have the same density. Comment on the sign and magnitude of the answer. ´ð£º

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2. ½«40kgA(Mn=1Íò£¬Mw=2Íò)ºÍ160kgB(Mn=4Íò£¬Mw=15Íò)¹²»ì£¬Çó¹²»ìÌåµÄMnºÍMw¡£ ´ð£ºMn??nM?niiiii??nAiMAi??nBiMBinA?nB?wA?wB40?160??2.5(Íò)

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