| ²é¿´: 439 | »Ø¸´: 1 | |||
| µ±Ç°Ö÷ÌâÒѾ´æµµ¡£ | |||
biodadiaoͳæ (СÓÐÃûÆø)
|
[½»Á÷]
»¯Ñ§ÀàѧÊõÂÛÎĵÄÓïÑÔ±í´ï
|
||
|
ºÃ¶«Î÷´ó¼Ò·ÖÏí ѧÊõÂÛÎĵÄÓïÑÔ±í´ï ²¹³ä²¿·Ö ӦעÒâµÄÎÊÌâµÄ²¹³ä Ò»£®Ê±Ì¬ ¡î µ±Ìáµ½±¾ÎÄ¡¢´Ëͼ¡¢´Ë±íµÈ˵Ã÷ÁË¡¢±í´ïÁËʲôʱҪÓÃÒ»°ãÏÖÔÚʱ£¬¶ø²»ÓÃÒ»°ã¹ýȥʱ¡£ This paper describes ¡¡ The focus of this paper is ¡¡ Figure 1 shows ¡¡ Most of the common condensation polymers are listed in Table 1-1. ¶þ£®Êý ¡î ÔÚѧÊõÂÛÎÄÀÓÐÊǺÜÄѹ˼°ÊýÉϵÄÂß¼¡£µ«Ò»°ã²»½«Âß¼ÉϵÄÎÊÌâÊÓΪÓï·¨´íÎó¡£Ö»Ðë×¢ÒâÔÚÒ»¸ö¾ä×ÓÖеÄÊýºÍνÓﶯ´ÊµÄͳһ¼´¿É¡£ µ¥¡¢¸´ÊýµÄÑ¡ÓÃÓÐһЩ·Ç¶¨ÐÔ¡¢µ«¿É¹©²Î¿¼µÄÇ÷Ïò£º ¡ô µ±º¬ÒâÉÏÇ¿µ÷¸´Êýʱ½¨ÒéÓø´Êý¡£ The catalyst concentrations for the different reactions are different. Our research focuses on the syntheses and characterizations of a series of polycarbonates with different chemical structures. The physical and chemical properties of this compound have been studied. The chain lengths of the oligomers with different molecular weights are different. µ±º¬ÒâÉϲ»Ç¿µ÷¸´Êýʱ¿ÉÓõ¥Êý»ò¸´Êý¡£ Our research focuses on the synthesis of polycarbonates. The property of the compounds in group 1 is different from the property of the compounds in group 2. The chain length of the oligomers increases with increasing reaction time. ¡ô ÔÚ±êÌ⡢С±êÌâÖÐ »ò ÃèÊöÒ»ÀàÊÂÎï¡¢ÏÖÏóµÈʱ£ºµ±Ìáµ½¾ßÌåÎïÖÊʱ³£Óø´Êý¡£ 2-1 Polyesters Polymers are macromolecules built up by large numbers of small molecules. The small molecules which combine with each other to form polymer molecules are termed monomers. ÔÚ±êÌ⡢С±êÌâÖÐ »ò ÃèÊöÒ»ÀàÊÂÎï¡¢ÏÖÏóµÈʱ£ºµ±Ìáµ½³éÏó¸ÅÄîʱ¿ÉÓõ¥Êý¡¢Ò²¿ÉÓø´Êý¡£ 2-11 Step Copolymerization 2-12 Newer Types of Step Polymerizations This chapter will consider the characteristics of step polymPOST http://muchong.com/bbs/post.php?action=newA7ÊõÂÛÎÄ¡¢ÓйØÑ§ÊõµÄ¿ÆÆÕÎÄÕÂÖеÄÃû´ÊµÄ¿ÉÊý»ò²»¿ÉÊýÌØÐԵĻ®·ÖÇø±ðÓÚ·ÇѧÊõÎÄÕÂ<·ÇѧÊõÎÄÕÂÖеĿÉÊý»ò²»¿ÉÊýÌØÐÔ¿É´Ó×Öµä²éµ½>¡£ ÒÔÏÂÊÇÔÚѧÊõÎÄÕÂÖÐͨ³£ÊÓΪ¿ÉÊýÃû´ÊµÄµ¥´Ê£º<µ«ÔÚÒ»°ã×ÖµäÖÐËüÃÇ»òËüÃÇ×öijÖÖº¬Òå½âʱ¿ÉÄܱ»»®¹é²»¿ÉÊýÃû´Ê¡£> application development consideration composition concentration distribution structure length weight ¡î µ±Í¬Ê±Ìá¼°¼¸¸öͼ¡¢±í¡¢·½³ÌʽʱҪÓø´Êý£¨·Ö±ðµ¥¸öµØÌá¼°Ôò²»Óã©£º The reaction rate constant can be calculated from Equations 2 and 3. The reaction rate constant can be calculated from Equation 2 and Equation 3. Figs. 4 and 5 show ¡¡ Èý£®¹Ú´Ê ¡î µ¥ÊýÃû´Êǰһ°ãÒª¼Ó¹Ú´Ê£ºa , theµÈ£» µ«ÒÔÏÂÇé¿ö¿É²»¼Ó£º ±íʾ²»ÌØÖ¸µÄ¡¢½Ï³éÏóµÄ¸ÅÄ This chapter will consider the characteristics of step polymerization in detail. An understanding of the relative ease of cyclization or linear polymerization comes from a variety of sources. Different polymers are synthesized to yield various mechanical behaviors by the appropriate combinations of crystallinity, crosslinking, Tg, and Tm. µ«Ðè×¢ÒâÕâЩµ¥´Êǰ¼Ó¹Ú´ÊÒ²ÊǾ³£¼ûµ½µÄ£¬ÕâÊÇÓÉËüÔÚ¾äÖеĺ¬Òå¾ö¶¨µÄ<ÈçÓÐÒ»¶¨µÄÌØÖ¸ÒâÒå>£º Polyisoprene is a typical elastomer ¨C it is amorphous, easily crossed, has a low Tg (-73¡ãC) and a high Tm (14¡ãC). ¡î Ŀ¼¡¢±êÌâÖÐͨ³£Ê¡ÂÔ¹Ú´Ê£º 1. Introduction 1-1 Types of Polymers and Polymerizations ¡ 1-4 Molecular Weight 1-5 Physical State ͼ¡¢±íµÄÌâÄ¿ÖÐÓÐʱ¿ÉÊ¡ÂÔ¹Ú´Ê£º Fig. 2-2 Second order plot of the self-catalyzed polyesterification of adipic acid with diethylene glycol at 166 ¡ãC. Fig. 8 Dependence of the ease of cyclization on the size of the ring. ¡î ¾ßÌåµÄ»¯Ñ§Ò©Æ·¡¢»¯Ñ§ÎïÖÊǰͨ³£²»¼Ó¹Ú´Ê£º The polymerization is catalyzed by protonic or lewis acids although a wide variety of base catalysts such as calcium acetate and antimony trioxide can also be used. ¡î ͼÖеĺᡢ×Ý×ø±êµÄÃû³ÆÇ°²»¼Ó¹Ú´Ê£º ËÄ£®´ó¡¢Ð¡Ð´£º ¡î Çë×¢ÒâÒÔϽṹµÄ´ó¡¢Ð¡Ð´£º µ±Ìá¼°¾ßÌåµÚ¼¸Õ¡¢½Ú£»Í¼¡¢±í£»·½³Ìʽʱ£¬Ê׸ö×Öĸͨ³£Òª´óд£º As discussed in Chapter 2, ¡¡ In Section 1.2, we ¡¡ As shown in Figure 1, ¡¡ The results are listed in Table 3. µ±²»Ö¸Ã÷Êǵڼ¸Õ¡¢½Ú£»Í¼¡¢±í£»·½³Ìʽʱ£¬Ê׸ö×ÖĸÈçÔÚ¾äÖÐͨ³£ÓÃСд£º In the previous chapter, ¡¡ As shown in this figure, ¡¡ Î壮Ëõд£º ÒÔÏÂÈ«ÃûºÍËõдÔÚÎÄÖÐͨ³£ÊÓΪͬµÈ£¬¿ÉÒÔ»¥»»¡£ Figure Fig. Figures Figs. Table Tab. Chapter Chap. Section Sec. Equation Eq. Equations Eqs. Áù£®Ò»Ð©³£ÓôʻãµÄÓ÷¨ ¡î research, study, investigate research¿É×öÃû´Ê¡¢¶¯´Ê£¬µ«Í¨³£×öÃû´ÊÓ㬺ÜÉÙ¼ûµ½¶¯´ÊµÄÓ÷¨¡£¾äÖÐÐèÒª¶¯´Êʱ³£ÓÃstudy»òinvestigateÀ´±í´ï¡£ ¡î detail/detailed The properties of this compound were studied in detail. The detailed properties of this compound were studied. The details of the properties of this compound were studied. ¡î follows/following The results are as follows: ¡¡ We got following results: ¡¡ ¡î increase, decrease increase, decrease ¾ù¿É×öÃû´ÊºÍ¶¯´Ê£º We can observe an increase in the reaction rate. The reaction rate increases. ¡î focus, concentrate focus: n. , v. The focus of this paper is ¡¡ This paper focuses on ¡¡ Our study focuses on ¡¡ We focus our study on ¡¡ Our study is focused on ¡¡ concentrate: v. We concentrate our study on ¡¡ Our study is concentrated on ¡¡ ¡î effect, affect effect: n. affect: v. ¡î compose, consist A is composed of B and C. A consists of B and C. ¡î increase, improve increase: Ö÷ÒªÖ¸ÊýÖµÉϵÄÔö¼Ó¡£ improve: Ö÷ÒªÖ¸ÐÔÖʵÄÔö¼Ó¡¢¸ÄÉÆ¡£ Æß£®Ãû´Ê×öÐÞÊÎ ÔÚѧÊõÎÄÕÂÖУ¬ºÜ¶àʱºò»áÓõ½Ö±½ÓÓÃÃû´Ê×öÐÞÊΣ¬¶ø²»Óá¯s »ò ¡¡ of ¡¡ µÄÐÎʽ¡£³£¼ûµÄÕâÀà´ÊÓУº reaction rate reaction rate constant reaction temperature reaction condition molecular weight distribution °Ë£®·Ö´Ê×öÐÞÊÎ the reaction we studied the temperature used the nonlinearity observed ¾Å£®ËùÓиñ ·ÇÈ˵ÄËùÓиñÓá¡of¡¡, ¶ø²»Óá¡¡¯s ¡£ |
» ²ÂÄãϲ»¶
²ÄÁÏѧ˶297ÒѹýËÄÁù¼¶Çóµ÷¼ÁÍÆ¼ö
ÒѾÓÐ3È˻ظ´
²ÄÁÏ080500µ÷¼ÁÇóÊÕÁô
ÒѾÓÐ5È˻ظ´
295¸´ÊÔµ÷¼Á
ÒѾÓÐ3È˻ظ´
271²ÄÁϹ¤³ÌÇóµ÷¼Á
ÒѾÓÐ7È˻ظ´
265Çóµ÷¼Á
ÒѾÓÐ8È˻ظ´
085410È˹¤ÖÇÄÜר˶317Çóµ÷¼Á£¨0854¶¼¿ÉÒÔ£©
ÒѾÓÐ4È˻ظ´
Ò»Ö¾Ô¸Î人Àí¹¤²ÄÁϹ¤³Ìר˶µ÷¼Á
ÒѾÓÐ6È˻ظ´
Ò»Ö¾Ô¸ ÄϾ©º½¿Õº½Ìì´óѧ´óѧ £¬080500²ÄÁÏ¿ÆÑ§Ó빤³Ìѧ˶
ÒѾÓÐ3È˻ظ´
279·ÖÇóµ÷¼Á Ò»Ö¾Ô¸211
ÒѾÓÐ7È˻ظ´
304Çóµ÷¼Á
ÒѾÓÐ5È˻ظ´
Åùö¨Ðý·ç
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
- Ó¦Öú: 3 (Ó×¶ùÔ°)
- ¹ó±ö: 0.95
- ½ð±Ò: 6428.7
- É¢½ð: 100
- ºì»¨: 4
- Ìû×Ó: 1124
- ÔÚÏß: 175.7Сʱ
- ³æºÅ: 62568
- ×¢²á: 2005-03-17
- ÐÔ±ð: GG
- רҵ: ±¬Õ¨Óë³å»÷¶¯Á¦Ñ§
2Â¥2006-09-06 22:12:26













»Ø¸´´ËÂ¥