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- hard segment ratio 硬段含量
- The results showed that in the case of having same ratio of soft to hard segment, both the PUD with ionic group in soft or hard segment had better stability. 结果表明,软、硬段比例相同的软段含离子PUD和硬段含离子PUD都具有良好的稳定性;
- Objective To evaluate the diagnostic value of ECG P wave/P-R segment ratio and E/A ratio of mitral flow spectrum for abnormal left ventricle diastolic function (LVDF). 目的评价心电图P波/P-R段比值和二尖瓣血流频谱E/A比值诊断左室舒张功能(LVDF)异常的价值。
- Nano-montmorillonite-aliphatic PU elastomer synthesized from HMDI, PTMG1000 and MMT2 with 40% mass fraction of hard segment possesses better mechanical properties. 以HMDI、PTMG1000和MMT2为原料,硬段质量分数为40%25时,所合成的纳米蒙脱土-脂肪族聚氨酯弹性体具有较好的力学性能。
- The effects of hard segment content on the microstructure and viscosity of polyether PU and PUU were studied by FT-IR, DSC, viscosimeter. 利用FT-IR,DSC,旋转黏度计研究了硬段含量对聚醚型PU和PUU的微观结构及黏度的影响。
- It's caused by the micro phase separation degree of TPU is increased as well as the soft hard segment structure is perfected. 研究认为热处理提高了TPU的微相分离程度,完善了TPU中的软硬段结构。
- For these PUU aqueous dispersions, the particle size decreases with the increase of the hard segment content, but their stability is enhanced. 结果表明:随硬段含量的增加,PUU水分散液的粒径减小,稳定性增加,室温贮存期大于1年;
- Applying the vector representation of formula for definite proportional division point in vector algebra, this paper obtains a new useful method of compunction for segment ratio in volume ratio. 利用向量代数中定比分点公式的向量形式,给出了一种非常简明有用的求容积比中线段比的新方法。
- Shape memory polyurethanes based on aliphatic diisocyanate HDI were synthesized with different hard segment contents to study the shape memory effect affected by hard segment. 以脂肪族异氰酸酯HD I为硬段原料合成了脂肪族的形状记忆聚氨酯,通过调节硬段含量研究了硬段结构对形状记忆性能的影响。
- Monomer?s chain segment ratio is usually characterized by measuring chlorinecontent. But it was found that the solubility of VDF/CTFE copolymer with similarchain segment ratio shows quite different. 通常采用测定氯含量的方法来表征此共聚物中的单体链节比,但也发现其中链节比相似的VDF/CTFE共聚物在溶解性上却表现出较大的差异性。
- When increasing hard segment content, the interaction between SPU moleculars is intensified whereas the miscibility of the blends in decreased consequently. 多嵌段聚氨酯硬段含量的增加,加强了SPU分子间的相互作用,同时也减小了共混物两组分的相容性。
- The factors include relative molecular mass of PTMG, diisocyanates, chain extenders, mass fraction of hard segment, NCO mass fraction and chemical crosslink in prepolymer,etc. 讨论了化学结构因素对聚氨酯弹性体力学性能的影响,化学结构因素包括PTMG相对分子质量、二异氰酸酯、扩链剂、硬段质量分数、预聚体NCO基质量分数和化学交联等。
- Abstract: The spherulite growth behaviour of hard segment has been studied by SALS and other techniques for polyester-polyether block copolymers with low hard segment content. 摘要: 采用SALS等方法研究了低硬段含量的聚酯-聚醚多嵌段共聚物中硬段结晶时的球晶生长规律。
- The results show that the level of polysulfide polyurea and the content of hard segment in polysulfide polyurea influence the morphology, T_g and modulus of cured epoxy resin. 结果表明,液体聚硫聚脲齐聚物的用量、齐聚物中聚脲含量对固化后的环氧树脂玻璃化温度、模量及形态有较大影响。
- The results show that PPP serves as "fiber" to strengthen the blend;the intermolecular interaction or compatibility between PPP and the hard segment of PU is revealed to a certain extent. 结果表明:刚性聚对苯撑与聚氨酯的硬段间有一定程度的相容,因而加入聚对苯撑能改善聚氨酯的拉伸强度和热稳定性;
- The effects of hard segment structure, hard segment content and chain extender with different structure on physical mechanical properties of dry films and water absorption were studied. 研究了不同硬段结构和硬段含量和扩链剂对其干膜物理机械性能和吸水率的影响。
- Polyurea coatings with different contents of hard segment polyaspartic ester(PAE) were investigated through aging tests of marine environment outdoor exposure and salt fog testing. 通过海洋大气环境户外暴晒老化试验和盐雾加速老化试验,试验研究了不同硬段含量的聚天冬氨酸酯(PAE)聚脲涂层的耐海洋环境老化性能。
- It is hard to sleep without a cooler in this room. 没有空气调节器,在这间屋里很难入睡。
- Abstract: The morphology of segmented copolyether-esters with low hard segment content has been studied by TEM. 摘要: 利用透射电镜技术对低硬链段含量聚酯-聚醚多嵌段共聚物中硬段结晶的形态进行了研究。
- It was also demonstrated by IR analysis that the hydrogen bonding between HDI based hard segments ... 同时IR结果证明,HDI形成的硬段间的氢键作用更强,从而得到了比芳香族形状记忆聚氨酯更高的形变回复率。