论文总字数：20402字

摘 要

苯乙烯-丁二烯-苯乙烯两相三嵌段共聚物（SBS）因其具有较多的优异性能，成为目前世界上产量最大的热塑性弹性体之一。但伴随着人们对高品质、高性能产品需求的急剧增长，SBS的性能在一些领域已不能满足人们的需要。因而对SBS进行进一步的改性，制备性能较好的TPR材料日渐受到了人们的广泛关注。

针对SBS材料自身作为非晶材料，耐热性不佳、力学性能（拉伸、撕裂等）强度不高等不足，本文拟用共混物之间相容性的影响以及SBS三嵌段的组成，选择低结晶度的间规1,2-聚丁二烯（s-PB）来对SBS进行改性研究，以期能探寻此类改性对共混物性能的影响。

本文研究采用机械共混法制备一系列不同配比的s-PB/SBS共混物，首先对系列共混物试样进行了红外光谱分析，然后借助于差示扫描量热分析仪按照设定的升降温速率对共混物的结晶行为以及熔融性能进行分析表征，依助热重分析仪来研究共混物的热稳定性能，扫描电子显微镜对共混物形貌进行了分析探寻结构与性能的联系，同时还通过电子万能试验机、硬度计等对共混物的力学性能进行研究。

从测试的结果可以得知：s-PB与SBS有很好的相容性；共混体系中SBS降低了s-PB的结晶性，s-PB所占的比例越高，共混物的热稳定性能越好；对于力学方面的结果，材料组分为s-PB/SBS=30/70时具有最高的拉伸强度和断裂伸长率，并且材料撕裂强度随着s-PB含量的增大而呈现递增的趋势。

关键词： 间规1,2-聚丁二烯（s-PB） SBS 共混

Study on the proporties of Syndiotactic 1,2-Polybutadiene/SBS blends

Abstract

Styrene-Butadiene-Styrene (SBS) as a two-phase triblock copolymer has become one of the world’s largest thermalplastic elastomers which have the excellent proprties. However, with the rapid demand of high-properties and performance products, the current products of SBS can’t meet people’s needs. Therefore, investigate on the modification of SBS to preparation high-qualities TPR materials has received widespread attention from researchers.

According to the research reports, SBS as an amorphous materials has the following weaknesses: the heat resistance properties is poor, the resistance to solvents is poor, and the mechanical properties is not high. Take the above weaknesses into account, in this parper, we consider the effects of the compatibility between the materials of blends and then we decide use low crystallinity syndiotactic 1,2-polybutadiene (s-PB) to blended with SBS hoping to explore the properties of the blends.

In this investigation, a serious of blends with different ratios were prepared by mechanical blending. First, we used FT-IR analysis the blends microstructures and the change of groups. Then, DSC and TGA was used to study the crystallization, melting behavior and thermal stability. Next, the mechanical properties of blends were tested and SEM was used to research the fracture morphology.

From the results, we can come to the follow conclusions: s-PB and SBS have a good compatibility. SBS reduced the crystallinity of s-PB. The higher proportion of s-PB, the better thermal stability of the blends. The tensile strength and elongation at break is the best at the proportion of s-PB/SBS=30/70, and the tear strength is increased with the increase of s-PB content.

Keywords: Syndiotactic 1,2-polybutadiene (s-PB); SBS; Blends

目 录

摘 要 I

Abstract II

第一章 前言 1

1.1 课题背景 1

1.2 课题的提出及研究思路 1

第二章 文献综述 3

2.1 SBS研究概况 3

2.1.1 SBS国内外研究进展 3

2.1.2 SBS的结构特点及合成方法 3

2.1.3 SBS的共混改性研究 5

2.1.4 SBS的应用 6

2.2聚丁二烯的研究概况 6

2.2.1聚丁二烯的研究状况及结构性能 6

2.2.2间规1,2-聚丁二烯的研究进展 7

第三章 实验部分 9

3.1 实验原料 9

3.2 实验仪器与设备 9

3.3 样品制备 9

3.3.1 熔融共混 9

3.3.2 压片成型 9

3.3.3 样条制备 10

3.4 测试与表征 10

3.4.1 傅里叶变换红外光谱分析 10

3.4.2 差示扫描量热分析 10

3.4.3 热重分析 10

3.4.4 共混物试样的形貌分析 10

3.4.5 力学性能分析 10

第四章 结果与讨论 12

4.1 傅里叶变换红外光谱分析 12

4.2 差示扫描量热分析 13

4.3 热重分析 15

4.4共混物试样的形貌分析 16

4.5 力学性能分析 17

4.5.1 拉伸试验 17

4.5.2 撕裂试验 18

4.5.3 硬度试验 19

第五章 结论 20

参考文献 21

致 谢 23

第一章 前言

1.1 课题背景

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