ATS／PEK—C共混物的相容性及其相分离

本文用动态力学扭辫分析(TBA)和扫描电镜(SEM)研究了乙炔端基砜(ATS)和酚酞型聚醚酮(PEK-C)共混物的相容性和相分离的行为特征.未固化ATS/PEK-C共混物为相容体系,ATS加入使PEK-C的Tg降低,共混物的Tg与ATS/PEK-C组成比有关.共混物在固化过程中发生相分离而形成两相结构,相分离程度与固化条件有关。     

聚醚醚酮与酚酞型聚芳醚砜共混物的相容性特征

本文借助示差扫描量热(DSC),扭辩分析(TBA)和傅里叶变换红外光谱(FTIR)等技术研究了聚醚醚酮(PEEK)/酚酞型聚芳醚砜(PES-C)共混物的相容性特征。结果表明共混物是部分相容的,共混物的相容程度与共混物的热历史有关。在共混物相容程度较高时,共混物的两个 T_g 随共混物组分的改变彼此向对方移动;共混使对应于 PES-CT_g 的玻璃化转变变宽。PEEK/PES-C 共混物的部分相容性从两者有一定程度的分子链水平的相互作用得到证实。     

热塑性/热固性聚砜共混物的固化及其生成SIPN的热行为特征EI

用乙炔端基砜(ATS)与双酚A型聚砜(PSF)、聚醚砜(PES)、酚酞型聚醚砜(PES-C)制备了热塑性/热固性聚砜共混物及其半互穿聚合性网络(SIPN),并借助DSC技术对ATS及其共混物的固化反应和动态、恒温固化条件对生成SIPN的热行为特征进行了表征。     

P34HB的4HB含量对PLLA/P34HB共混物结构和性能的影响

采用熔融共混方法制备了聚乳酸/聚(3-羟基丁酸-4-羟基丁酸酯)(PLLA/P34HB)共混物,其中P34HB的4HB摩尔含量分别为11%与17%。通过扫描电子显微镜、动态力学分析、差示扫描量热仪和力学性能测试,考察了共混物的相容性、熔融行为与力学性能。结果表明,当P34HB组分质量分数为25%以上时,共混物两相玻璃化转变温度(Tg)相互靠近,为部分相容体系,且4HB含量越少,PLLA/P34HB共混物的相容性越好。共混物中PLLA的结晶性能随P34HB含量的增加而降低,且4HB含量越大,由于较差的相容性导致P34HB对PLLA的链段运动能力影响减小,共混物中PLLA结晶性能越好。随P34HB含量的增加,共混物的强度降低,断裂伸长率升高,且4HB含量越大,共混物力学性能由于两相相容性较差而低于4HB含量较低的共混体系。     

季铵盐共聚物/聚醚砜相容性及其共混膜性能研究

研究了季铵盐-丙烯腈共聚物(PQA-co-AN)/聚醚砜(PES)共混体系的相容性和共混膜的性能.热力学预测、黏度测试和扫描电镜观察表明,PQA-co-AN/PES共混体系部分相容;共混膜的水通量随PQA-co-AN含量增加有极小值,截留率整体趋势变大,抑菌率随PQA-co-AN含量的增加而增大.     

聚醚砜与热致液晶共混物的相容性

用示差扫描量热器，动态粘弹谱仪和扫描电镜研究了热致液晶与聚醚砜的相容性，当液晶含量小于１０％时，共混物为相容体系，含量在１０％－２０％为部分相容体系，含量超过２０％为相分离体系。     

乙炔端基砜基Semi—IPN的性能和破坏形态

制备了由热固性乙炔端基砜(ATS)低聚物与热塑性树脂聚砜(PSF)、酚酞型聚砜(PES-C)、酚酞型聚醚酮(PEK-C)组成的半互穿聚合物网络(Semi-IPN)。并对其熔融指数(MI)、热变形温度(HDT)、抗溶剂性、热稳定性、力学性能和破坏形态进行了研究。ATS能提高未固化共混物的MI和降低其HDT;固化后Semi-IPN具有与纯热塑性树脂相同的HDT,抗溶剂性能明显提高,热稳定性和力学性能与ATS含量有关。     

超支化环氧树脂增韧增强苯并噁嗪树脂

将芳香二元胺型苯并噁嗪(DDM)与全脂肪链超支化环氧树脂(AHEP)按照不同配比进行共混固化,制备出完全相容的DDM/AHEP共混固化物。用傅里叶变换红外光谱和差示扫描量热仪研究了共固化体系的固化物结构特征及其固化反应行为。使用动态热机械性能分析仪表征了共固化体系固化物的热机械性能,结果表明,共混固化物的冲击强度和弯曲模量协同增韧增强。当AHEP添加量为5%(质量分数)时DDM/AHEP固化物的弯曲模量比纯苯并噁嗪树脂提高了11.5%,冲击强度则提高了167%。共混固化物的断面形貌,呈现出原位增韧增强的特征。     

聚砜—聚醚砜共混膜相容性及凝胶特性研究

研究了聚砜（PSF）与聚醚砜（PES）共混膜的相容性及其凝胶特性．首先,通过计算PSF－PES共混体系的混合热,从理论上预测该共混体系相容性,并用反相气相色谱法（IGC）测定相互作用参数．研究PSF－PES共混体系相容性与组成的关系;通过粘度测定研究了共混制膜液的溶混性;探讨了共混制膜液的凝胶特性．研究结果表明,PSF－PES共混体系为部分相容体系,且其溶混性与组成有关,共混可明显改变制膜液的凝胶特性．     

聚醚醚酮与酚酞型聚芳醚酮的共混研究EI

借助DSC、FTIR、PLM(偏光显微镜)、SEM技术研究了聚醚醚酮(PEEK)/酚酞型聚芳醚酮(PEK-C)共混物的相容性特征及结晶行为、结晶形态。结果表明该共混物是部分相容的,其相容程度与共混物的组分比及热历史有关;共混物中PEK-C对PEEK的结晶有阻碍,其阻碍与共混物的组分比及结晶条件有关;共混物的结晶形态对共混组分比有较大的依赖,同时还与结晶温度有关。     

Influence of processing conditions on rheological and mechanical properties of polycarbonate/polypropylene blends

Rheological and mechanical data on polycarbonate/polypropylene blends are reported as a function of the blend preparation. Both kinds of properties depend on the properties of the homopolymers and on the processing conditions. In the molten state the blends are compatible at low content of polypropylene and incompatible at high content. The blends with intermediate compositions can be called semicompatible. Also in the solid state the blends with low content of polypropylene are compatible, while all other blends are incompatible.     

固化条件对热塑增韧环氧树脂的固化动力学和相分离的影响EI

采用砂型和金属型两种不同铸造方法对铸态、固溶态和时效态ZL210A合金性能及断口形貌的影响进行研究.结果表明:对ZL210A铸造合金而言,金属型铸造方法优于砂型铸造方法,其常规力学性能σb,σ0.2和δ5均高于砂型铸造,从断口形貌上看,试样断口形貌均呈现典型的穿晶断裂,且韧窝较深.其中,金属型固溶态试样的断口韧窝最为明显,呈现出较好的韧性.     

固化条件对热塑增韧环氧树脂的固化动力学和相分离的影响

Thermoplastic toughened epoxy resins are widely used as matrices in modern prepreg systems.Different curing conditions play a great role in affecting the cure kinetics and phase behaviour of thermoplastic modified epoxies which further result in different mechanical properties of polymer matrix composites.Since the morphology of the cured thermoplastic/epoxy blends is directly related to the mechanical properties,it is essential to control processing conditions for obtaining desirable morphology.A polyethersulphone (PES) modified multifunctional epoxies,triglycidylaminophenol (TGAP) and tetraglycidyldiaminodiphenylmethane (TGDDM),was used for investigation.The cure kinetics and cured morphology of polymer blends heated at different heating rates and cured at different temperature were studied.It is shown that higher cure temperature and higher heating rate display similar effects in the epoxy conversion and the domain size of phase separated structure.     

乙炔端基砜基Semi-IPN的两相结构与相分离机理

本文用扫描电镜(SEM)研究了乙炔端基砜(ATS)基半互穿聚合物网络(Semi-IPN)的两相结构,发现这一体系可形成共连续两相结构。提出了双网络-球粒结构馍型,并讨论了相分离机理以及影响相形态的动力学因素。     

聚丙烯／丙烯－辛烯共聚物共混体系的研究

利用扫描电镜、差热扫描量热计和动态粘弹谱仪等手段研究了聚丙烯／丙烯－辛烯共聚物共混体系的相容性及结晶和转变性能等。研究结果表明，该共混体系是完全相容的体系，该共混物的低温韧性优于聚丙烯。     

聚醚醚酮与酚酞型聚芳醚酮的共混研究

借助DSC、FTIR、PLM(偏光显微镜)、SEM技术研究了聚醚醚酮(PEEK)/酚酞型聚芳醚酮(PEK-C)共混物的相容性特征及结晶行为、结晶形态。结果表明该共混物是部分相容的,其相容程度与共混物的组分比及热历史有关;共混物中PEK-C对PEEK的结晶有阻碍,其阻碍与共混物的组分比及结晶条件有关;共混物的结晶形态对共混组分比有较大的依赖,同时还与结晶温度有关。     

NR/CSM/biogenic silica rubber blend composites

Biogenic silica (BSi) was added at different ratios to some polymer blends of polyisoprene rubber (NR) and chlorosulphonated polyethylene rubber (CSM) cured by conventional sulfur system. The reinforcing performance of the filler was investigated using rheometric, mechanical and swelling measurements, differential scanning calorimetry (DSC), thermogravimetric (TGA) and scanning electron microscopy (SEM) analysis. There was a remarkable decrease in the optimum cure time (t_c90) and the scorch time (t_s2), which was associated with an increase in the cure rate index (CRI), with filler loading up to 30 phr in the different blend ratios. The tensile strength and hardness was 4–5 Sh-A higher in the case for the different blend compositions, while the resistance to swelling in toluene became higher. SEM photographs show that the filler is located at the interface between the different polymers which induces compatibilization in the immiscible blends. DSC scans of the filled blends showed shifts in the glass transition temperatures Tg which can be attributed to the improve interfacial bonding between filler and NR/CSM matrix. A higher thermal stability of NR/CSM/BSi composites was detected.