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8. When a polymer is stressed in tension, the ( A ) with the stretch rate increases¡£ (A) ¦ÒB increases and ¦ÅB decrease; (B) ¦ÒB decrease and ¦ÅB increase; (C) ¦ÒB increase and ¦ÅB increase; (D) ¦ÒB decrease and ¦ÅB decrease

9. Õ³µ¯ÐÔÊǸ߾ÛÎïµÄÖØÒªÌØÕ÷£¬ÔÚÊʵ±ÍâÁ¦×÷ÓÃÏ£¬£¨ C £©ÓÐÃ÷ÏÔµÄÕ³µ¯ÐÔÏÖÏó¡£ (A) TgÒÔϺܶà (B) Tg¸½½ü (C) TgÒÔÉϺܶà (D) TfÒÔÉÏ

10. Which are correct about Polystyrene-b-polybutadiene-b-polystyrene (SBS) £¨A, B, D£©:

(A) SBS is a thermoplastic elastomers (B) SBS is a block copolymer (C) SBS is a alternative copolymer

(D) SBS is obviously two-phase structure, as the continuous phase PB, PS of the dispersed phase.

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ϩת±äΪ¼äͬÁ¢¹¹¾Û±ûÏ©¡£( ? )

2. Based on Avrami equation, when polymer forms spherulites (three-dimensional growth of the

crystals) with a heterogeneous nucleation mechanism, the Avrami exponent (n) should be 3. ( ? )

3. For polymer blends with a UCST diagram, phase separation will take place when

temperature is below the UCST at any composition. ( ? )

4. For a polymer, the viscosity-average molecular mass is larger than its weight-average

molecular mass. ( ? )

5. ¾ÛºÏÎïµÄÈ¡Ïò̬ÊÇÒ»ÖÖÈÈÁ¦Ñ§Îȶ¨×´Ì¬¡£( ? )

6. The Maxwell element is good at predicting stress relaxation behavior of linear polymer.

( ? )

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2. Lower critical solution temperature µÍÁٽ繲ÈÜζÈ

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