Curing rates of an epoxy amine system were varied via different curing cycles, and glass-fiber epoxy composites were prepared using the same protocol, with the aim of investigating the correlation between microstructure and composite properties. It was found that the fast curing cycle resulted in a non-homogenous network, with a larger percentage of a softer phase. Homogenized composite properties, namely storage modulus and quasi-static intra-laminar shear strength, remained unaffected by the change in resin microstructure. However, fatigue tests revealed a significant reduction in fatigue life for composites cured at fast curing rates, while composites with curing cycles that allowed a pre-cure until the critical gel point, were unaffected by the rate of reaction. This result was explained by the increased role of epoxy microstructure on damage initiation and propagation in the matrix during fatigue life. Therefore, local non-homogeneities in the epoxy matrix, corresponding to regions with variable crosslink density, can play a significant role in limiting the fatigue life of composites and must be considered in the manufacturing of large scale components, where temperature gradients and significant exotherms are expected.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415024 | PMC |
| http://dx.doi.org/10.3390/polym10020125 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effectiveness and tolerability of rimegepant in the acute treatment of migraine: a real-world, prospective, multicentric study (GAINER study).
J Headache Pain
January 2025
Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy.
Background: Rimegepant, a novel oral calcitonin gene-related peptide receptor antagonist, has been recently approved for the acute migraine treatment. While its efficacy was confirmed in randomized clinical trials, no data is available regarding real-life effectiveness and tolerability. GAINER, a prospective, multicentric study, aimed to evaluate rimegepant effectiveness and tolerability in the real-world setting.
View Article and Find Full Text PDFAssessment of the functional and health-related needs of patients with metastatic breast cancer prior to initiation of cancer treatment.
Breast Cancer Res Treat
January 2025
University of North Carolina School of Medicine, Chapel Hill, NC, USA.
Purpose: To identify needs of metastatic breast cancer patients prior to starting a new systemic treatment.
Methods: Fifty patients with newly diagnosed, recurrent, or progressive metastatic breast cancer completed an electronic survey which included patient-reported outcome measures of function (PROMIS Cancer Function Brief 3D profile), quality of life (FACT-G), exercise (Godin Leisure-Time exercise questionnaire), and diet (REAP-S); demographic information; and self-reported use of or referral to specific resources at the cancer center prior to beginning a new systemic oncologic treatment.
Results: Prior to starting a new treatment for metastatic breast cancer, patients reported mild functional impairment (PROMIS Cancer Function Brief 3D profile mean score:42.
Effects of Acupuncture on Cognitive Functions in Patients with Relapsing-Remitting Multiple Sclerosis: A Randomized Controlled Trial.
Chin J Integr Med
January 2025
Department of Acupuncture and Moxibustion, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100007, China.
Objective: To explore the effects of acupuncture in comparison with sham acupuncture on cognitive functions in patients with relapsing-remitting multiple sclerosis (RRMS).
Methods: In this randomized controlled trial, 31 RRMS patients in the acupuncture group were treated with traditional Chinese acupuncture based on the treatment principle of calming the mind, reinforcing qi and blood, and 31 patients in the control group were treated with sham acupuncture (shallow needling at non-acupuncture points) twice a week for 12 weeks. The primary outcome was the Brief International Cognitive Assessment for Multiple Sclerosis (BICAMS) score, which was evaluated by a psychologist at baseline and after 12 weeks of treatment.
Exploring fatigue in Marfan and hypermobile Ehlers-Danlos syndromes: an analytical cross-sectional study in two Italian healthcare centres.
BMJ Open
January 2025
Regional Center of Ehlers-Danlos Syndrome, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
Objective: This study investigates the prevalence and underlying factors of fatigue in individuals with Marfan syndrome (MFS) and hypermobile Ehlers-Danlos syndromes (hEDS), highlighting the necessity for focused research on this symptom within these patient populations.
Design: Cross-sectional, multicentre study.
Setting: Data were collected from participants diagnosed with MFS or hEDS across multiple healthcare centres.
Moral distress, ethical climate, and compassion fatigue among oncology nurses: the mediating role of moral distress.
BMC Nurs
January 2025
Medical Ethics and Low Research Center, Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Background: Oncology nurses have a vital role in providing care for individuals with cancer. Ethical dilemmas arise for oncology nurses caring for these patients. Nurses experience moral distress when work conflicts with personal beliefs, leading to inappropriate responses or uncertainty about ethics.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!