Study on the repairing effect of poly(N-vinylpyrrolidone-co-methacrylic acid)on permed or bleached damaged hair

聚(N-乙烯基吡咯烷酮-co-甲基丙烯酸)对烫/漂发质的修复

The repairing effect of poly(N-vinylpyrrolidone-co-methacrylic acid)on permed or bleached damaged hair was studied.The combing and tensile strength of permed and bleached hair before and after treatment with the copolymer solution were tested,and the effects of the mass fraction of copolymer solution and immerseing time on the combing and tensile strength for permed or bleached damaged hair were investigated.The repair mechanism of permed or bleached damaged hair was also explored.The results show that when the immersing time is 3 hours,the tensile strength of the permed hair increases with the mass fraction of the copolymer solution Tensile strength within 0%-0.3%,but no obvious change is observed when250 Yield strength the mass fraction is over 0.3%.Therefore,the optimal mass 200 fraction of the copolymer solution for repairing the permed hair(cN/dtex)is 0.3%.Similarly,the optimal mass fraction of the copolymer 150strength/solution for repairing the bleached hair is 0.5%.Furthermore,the effects of immersing time on the tensile strength of the100Tensile damaged hair fibers were compared between the permed and90 bleached hair before and after treatment with the copolymer500.40.30.500.10.2 solution.Coincidentally,the optimal immersion time for permedw(P(NVP-co-MAA))/%or bleached damaged hair is both 2 hours.The tensile strength of the permed and bleached hair soaked in 0.3%and 0.5%copolymer solutions for 2 hours increases by 15.55%and 18.12%,respectively,compared to untreated hair.Through infrared spectroscopy analysis,it is found that the amide II band in hair fibers shifted to the blue after repair,with the wave number shift of 11.12 and 11.09 cm^(-1),which confirm the formation of hydrogen bonds in the hair samples.Additionally,the urea hydrogen bond disruption experiment demonstrates that urea does not disrupt the hydrogen bonds in untreated hair fibers,but prevents the formation of new hydrogen bonds in damaged hair fibers.It further validates that the improvement of the tensile strength of the copolymer treated damaged hair fibers is mainly due to the formation of hydrogen bonds.After treatment with the copolymer,the dry and wet combing friction decrease by 30.73%and 28.55%for the permed hair,and decrease by 28.55%and 24.83%for the bleached hairs,respectively.The scanning electron microscope shows that the copolymer can flatten the cuticle and fill the space between the raised cuticles.

研究了无规共聚物聚(N-乙烯基吡咯烷酮-co-甲基丙烯酸)(P(NVP-co-MAA)对烫发及漂发发质的修护效果。分别对烫/漂发质修护前后发样的梳理性及抗拉伸性能进行了测试,测试了聚合物质量分数及浸泡时间对梳理性及抗拉伸性能的影响,并对受损发质的修护机理进行了探究。结果表明:分别使用0.3%及0.5%的聚合物溶液浸泡2 h后的烫发及漂发发样相较于未处理发样的断裂强度分别提升15.55%及18.12%。通过对修护前后发样的红外光谱分析及尿素氢键破坏实验证实,聚合物对受损发样抗拉伸强度的提升主要依靠氢键的形成。聚合物修护后,烫发发样的干梳及湿梳摩擦系数降低了30.73%与28.55%,漂发发样干梳及湿梳摩擦系数分别降低28.55%与24.83%。通过扫描电子显微镜对修护前后的烫/漂发样进行观察,发现聚合物能有效抚平毛鳞片,并填充于翘起的毛鳞片之间。