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This paper describes ¡­¡­

The focus of this paper is ¡­¡­

Figure 1 shows ¡­¡­

Most of the common condensation polymers are listed in Table 1-1.

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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.

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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.

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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.

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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>¡£

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application       development        consideration
composition      concentration        distribution
structure        length         weight

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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 ¡­¡­

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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.

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Polyisoprene is a typical elastomer ¨C it is amorphous, easily crossed, has a low Tg  (-73¡ãC) and a high Tm (14¡ãC).

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1.        Introduction
1-1        Types of Polymers and Polymerizations
¡­
1-4 Molecular Weight
1-5 Physical State

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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.

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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.

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As discussed in Chapter 2, ¡­¡­

In Section 1.2, we ¡­¡­

As shown in Figure 1, ¡­¡­

The results are listed in Table 3.

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In the previous chapter, ¡­¡­

As shown in this figure, ¡­¡­

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Figure        Fig.        Figures         Figs.
Table         Tab.
Chapter       Chap.
Section       Sec.
Equation      Eq.        Equations        Eqs.


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¡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¡£

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reaction rate     reaction rate constant      reaction temperature         reaction condition
molecular weight distribution

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the reaction we studied

the temperature used

the nonlinearity observed

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