EFFECT OF INTERFACIAL ADHESION ON THE IMPACT TOUGHNESS AND TOUGHENING MECHANISMS OF PVC/NBR BLENDS

LIU Zhehui; ZHU Xiaoguang; ZHANG Xuedong; QI Zongneng; CHOY C L; WANG Fo

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EFFECT OF INTERFACIAL ADHESION ON THE IMPACT TOUGHNESS AND TOUGHENING MECHANISMS OF PVC/NBR BLENDS

Research Article | 更新时间：2021-03-19

- EFFECT OF INTERFACIAL ADHESION ON THE IMPACT TOUGHNESS AND TOUGHENING MECHANISMS OF PVC/NBR BLENDS
- Acta Polymerica Sinica Issue 3, Pages: 283-288(1997)
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- Published：20 June 1997，
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LIU Zhehui, ZHU Xiaoguang, ZHANG Xuedong, QI Zongneng, CHOY C L, WANG Fo. EFFECT OF INTERFACIAL ADHESION ON THE IMPACT TOUGHNESS AND TOUGHENING MECHANISMS OF PVC/NBR BLENDS. [J]. Acta Polymerica Sinica (3):283-288(1997)
DOI：

LIU Zhehui, ZHU Xiaoguang, ZHANG Xuedong, QI Zongneng, CHOY C L, WANG Fo. EFFECT OF INTERFACIAL ADHESION ON THE IMPACT TOUGHNESS AND TOUGHENING MECHANISMS OF PVC/NBR BLENDS. [J]. Acta Polymerica Sinica (3):283-288(1997) DOI：

摘要

应用丙烯腈（ＡＮ）含量不同的丁腈橡胶（ＮＢＲ）与聚氯乙烯（ＰＶＣ）共混

研究了界面粘结对ＰＶＣ／ＮＢＲ共混物脆韧转变的影响．结果表明：当基体层度Ｔ相等时

过强的界面粘结

使ＰＶＣ／ＮＢＲ共混物的冲击强度降低

并且其产生脆韧转变的临界基体层厚度Ｔｃ减小．界面粘结对于聚合物共混物的增韧行为具有直接的影响．损伤区分析给出：随着界面粘结强度增大

空洞化过程受阻

减弱能量的耗散

并且不利于诱导剪切屈服损伤的产生

因而不利于增韧；但是界面粘强度过小

意味着共混物的相容性太差

致使分散相粒径过大

也不利于增韧．所以对增韧来讲

共混物的界面粘结强度存在一个最佳范围．

Abstract

The present work studies the effect of interfacial adhesion on the brittle ductile transition (BDT) in PVC/NBR by strengthening the interfacial adhesion through an increase of the acrylonitrile (AN) content in NBR The rubbers

NBR18 and NBR26

consist of 18 and 26 wt % of AN

respectively There are two BDT master curves for PVC/NBR blends

when impact strength ( S I ) is plotted against matrix ligament thickness ( T=T(d

φ )

where d is the NBR particle diameter

σ the dispersity of particle diameter

and φthe volume fraction of dispersed phase

respectively.)Below the critical value Tcof T

the blend becpmes extremely tought.At any given T the SI of PVC/NBR26 is lower than that of PVC/NBR18

and the transition in PVC/NBR26 occurs at a lower T value

indicating that strong interfacial adhesion is not favorable for achieving high toughness.The stress whitening zone and SEM photograph of fracture of the samples shows that

as interfacial adhesion is too strong

interfacial debonding and hence cavitation is hindered

thereby delaying the occurrence of shear yield deformations.

关键词

聚合物共混物橡胶增韧聚氯乙烯界面粘结脆韧转变

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