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Influence of the hard segments content on the structure, viscoelastic and adhesion properties of thermoplastic polyurethane pressure sensitive adhesives
Journal of Adhesion Science and Technology ( IF 2.3 ) Pub Date : 2020-06-24 , DOI: 10.1080/01694243.2020.1780774
Mónica Fuensanta 1 , José Miguel Martín-Martínez 1
Affiliation  

Abstract New thermoplastic poly(ether-urethane)s (PUs) with different hard segments (HS) contents (13.9–24.4% by weight) intended for pressure-sensitive adhesives (PSAs) have been synthesized by reacting different blends of polyether diols of different molecular weights – poly(propyleneglycol) (PPG) of molecular weight 2000 Da and poly(tetrahydrofuran) (PTHF) of molecular weight 1000 Da – 4,4′-diphenylmethane diisocyanate, and 1,4-butanediol, the prepolymer method was used. The increase of the HS content increased the contribution of the associated by hydrogen bond urethane groups and decreased the degree of micro-phase separation in the PUs synthetized with PPG + PTHF blends, an increase of the thermal stability was also obtained. On the other hand, the PU made with NCO/OH ratio of 1.10 showed unexpected properties because the contribution of the free urethane groups, the storage modulus and the temperature at the cross-over between the storage and loss moduli were higher than in the rest of the PUs synthesized with different NCO/OH ratios. The PUs with HS contents of 14.0–16.7% by weight were typical general-purpose pressure-sensitive adhesives (PSAs), whereas the PUs with HS content of 19–22% by weight were typical high shear PSAs. All PU PSAs followed the Dahlquist criterion and the one synthesized with 50 wt% PPG + 50 wt% PTHF and an NCO/OH ratio of 1.10 showed an optimal balance between tack, shear resistance and 180° peel strength values.

中文翻译:

硬链段含量对热塑性聚氨酯压敏胶结构、粘弹性和粘合性能的影响

摘要 具有不同硬链段 (HS) 含量(按重量计 13.9-24.4%)的新型热塑性聚(醚-氨基甲酸酯)(PUs)用于压敏粘合剂(PSA),是通过将不同的聚醚二醇的不同共混物反应而合成的。分子量 - 分子量为 2000 Da 的聚(丙二醇)(PPG)和分子量为 1000 Da 的聚(四氢呋喃)(PTHF) - 4,4'-二苯基甲烷二异氰酸酯和 1,4-丁二醇,使用预聚物方法。HS含量的增加增加了由氢键氨基甲酸酯基团缔合的贡献并降低了用PPG+PTHF共混物合成的PU中的微相分离程度,还获得了热稳定性的增加。另一方面,PU 制成的 NCO/OH 比为 1。图 10 显示了出乎意料的特性,因为游离氨基甲酸酯基团的贡献、储能模量和储能模量和损耗模量之间的交叉温度高于使用不同 NCO/OH 比率合成的其余 PU。HS 含量为 14.0-16.7%(重量)的 PU 是典型的通用压敏粘合剂(PSA),而 HS 含量为 19-22%(重量)的 PU 是典型的高剪切 PSA。所有 PU PSA 都遵循 Dahlquist 标准,合成的 50 wt% PPG + 50 wt% PTHF 和 NCO/OH 比为 1.10 的 PU PSA 表现出粘性、抗剪强度和 180° 剥离强度值之间的最佳平衡。存储模量和损耗模量之间交叉处的储能模量和温度高于使用不同 NCO/OH 比率合成的其余 PU。HS 含量为 14.0-16.7%(重量)的 PU 是典型的通用压敏粘合剂(PSA),而 HS 含量为 19-22%(重量)的 PU 是典型的高剪切 PSA。所有 PU PSA 都遵循 Dahlquist 标准,而由 50 wt% PPG + 50 wt% PTHF 和 NCO/OH 比为 1.10 合成的 PU PSA 表现出粘性、抗剪强度和 180° 剥离强度值之间的最佳平衡。存储模量和损耗模量之间交叉处的储能模量和温度高于使用不同 NCO/OH 比率合成的其余 PU。HS 含量为 14.0-16.7%(重量)的 PU 是典型的通用压敏粘合剂(PSA),而 HS 含量为 19-22%(重量)的 PU 是典型的高剪切 PSA。所有 PU PSA 都遵循 Dahlquist 标准,合成的 50 wt% PPG + 50 wt% PTHF 和 NCO/OH 比为 1.10 的 PU PSA 表现出粘性、抗剪强度和 180° 剥离强度值之间的最佳平衡。
更新日期:2020-06-24
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