聚乙烯醇接枝聚硅氧烷的制备与性能
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常州大学材料科学与工程学院 江苏 常州 213164

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江苏省研究生科研与实践创新计划(SJCX21_1181)


Preparation and properties of polyvinyl alcohol grafted polysiloxane
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    摘要:

    通过阴离子聚合向聚乙烯醇(PVA)引入聚二甲基硅氧烷,制得以碳为主链,硅氧烷为侧链的亲水性共聚物(PVA-PDMS-OH)。与正硅酸四乙酯进行脱醇硫化制备耐碱性的交联共聚物,提高了纯PVA-PDMS-OH的耐热、疏水的特性。使用PVA-PDMS-OH的硫化涂层覆盖改性聚对苯二甲酸乙二醇酯(PET)膜片表面,发现改性PET膜片透光率最高可提升至92.7%。将PVA-PDMS-OH添加到α,ω-二羟基聚二甲基硅氧烷(PDMS-OH)中制得共混硅橡胶。发现在共混硅橡胶中PVA-PDMS-OH的添加量为10% wt时,共混硅橡胶的拉伸强度达到0.842 MPa,增加到纯PDMS-OH硅橡胶的6.7倍;断裂伸长率达到168.2%,增加到纯PDMS-OH硅橡胶的2.6倍。表明PVA-PDMS-OH可用于提高硅橡胶的拉伸强度和硅橡胶延伸率,改善其韧性,说明它在改进硅橡胶性能方面存在应用前景。

    Abstract:

    The copolymer (PVA-PDMS-OH) with carbon as the main chain and siloxane as the pendant group was prepared by introducing dimethylsiloxane into polyvinyl alcohol through anionic polymerization. The alkali-resistant cross-linked copolymer was obtained through dealcoholization vulcanization reaction between PVA-PDMS-OH and tetraethyl orthosilicate. The heat-resistant and hydrophobic properties of the pure PVA-PDMS-OH was improved by dealcoholization vulcanization reaction. The polyethylene terephthalate (PET) film was modified by the sulfide coating of PVA-PDMS-OH, and it was found that the light transmittance of the modified PET film can be increased to 92.7%. The PVA-PDMS-OH was added to α,ω-dihydroxy polydimethylsiloxane (PDMS-OH) to prepare a blended silicone rubber. It was found that when the addition amount of PVA-PDMS-OH in the blended silicone rubber was 10% wt, the tensile strength of the blended silicone rubber reached 0.842 MPa, which was increased to 6.7 times that of the PDMS-OH silicone rubber; the elongation at break reached 168.2%, which was increased to 2.6 times that of PDMS-OH silicone rubber. The results indicated that the tensile strength, toughness and hardness of silicone rubber could be improved by adding PVA-PDMS-OH. It shows that PVA-PDMS-OH has application prospects in improving the performance of silicone rubber.

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  • 收稿日期:2021-12-20
  • 最后修改日期:2022-03-07
  • 录用日期:2022-03-28
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